ARC EXTINGUISHER

Abstract

An arc extinguishing device is disclosed. An arc extinguishing device according to one aspect of the present disclosure includes: a grid member positioned close to an external fixed contact point and a movable contact point to extinguish an arc generated when the fixed contact point and the movable contact point are separated; and an arc guide coupled to the grid member and configured to produce a gas by reacting with the generated arc. The grid member includes a grid body configured to define a body of the grid member and arranged to be spaced apart from the fixed contact point and the movable contact point; a grid arm provided continuously with the grid body and extending toward the fixed contact point and the movable contact point; and an arc expansion space.which is defined by being partially surrounded by the grid body and the grid arm, and which is adapted to receive the movable contact point so that the movable contact point is movable, and wherein the arc guide is coupled to the grid arm and is arranged such that it partially surrounds the arc expansion space to produce a gas by means of heat from the generated arc.

Description

[Technical field]

[0001] The present disclosure relates to an arc extinguishing device, and more particularly to an arc extinguishing device having a structure capable of effectively extinguishing an arc occurring during an interrupting operation. [State of the art]

[0002] A circuit breaker is installed in a power system and connected to a power source and a load to enable electrical conduction. When an abnormal electrical current is generated between the power source and the load, the circuit breaker performs an interrupting operation to interrupt the electrical conduction between the power source and the load. Therefore, damage to the power source and load caused by the abnormal electrical current can be avoided.

[0003] Typically, the circuit breaker includes a fixed contact point that is fixedly installed and a movable contact point that is movably provided. The movable contact point is provided such that it is movable in a direction toward the fixed contact point or a direction opposite to the fixed contact point. When the movable contact point is in contact with the fixed contact point, electrical conduction is possible between the power source and the load. If an abnormal electric current is generated, the movable contact point is separated from the fixed contact point, thus resolving the electrical conduction state between the power source and the load.

[0004] The moment the movable contact point and the fixed contact point are separated, the electric current, that is, the abnormal electric current, flows through the movable contact point and the fixed contact point. Therefore, when the movable contact point and the fixed contact point are separated, the energy of the flowing electric current is converted into a high-temperature, high-flux-density electron flow. This converted flow of electrons is called an arc.

[0005] As described above, the arc is the flow of electrons with high temperature and high flux density. Therefore, there is a concern that if the arc stagnates inside the circuit breaker without being discharged to the outside of the circuit breaker, other components of the circuit breaker may be damaged by the heat or pressure of the arc. Therefore, there is a need for a process to discharge the generated arc to the outside while reducing the temperature and pressure of the arc. Such a process is called the arc quenching process.

[0006] To extinguish the arc, the arc must be sufficiently and quickly stretched. Additionally, the stretched arc can be divided into short arcs (typically referred to as small arcs), and the arc must be discharged to the outside. For this purpose, the circuit breaker generally has an arc extinguishing device comprising multiple grids.

[0007] Recently, new and renewable energies, such as solar energy, have come into focus, creating a growing demand for technologies suitable not only for large current interruption processes, but also for small current interruption processes. For small currents, the energy and pressure of the generated arc are lower than for large currents. Therefore, if the arc extinguishing device used for large currents is used unchanged for small currents, it is difficult to generate sufficient energy to stretch, divide, and guide the arc.

[0008] For this reason, an arc quenching device provided in a circuit breaker to interrupt smaller currents requires additional energy to stretch and divide the generated arc.

[0009] KR 10 1 031 975 B1 discloses an arc extinguishing device for a DC switch. In particular, the patent document discloses the arc extinguishing device for a DC switch that can guide the generated arc using permanent magnets arranged to face each other, with a fixed contact and a movable contact interposed therebetween.

[0010] However, the arc-extinguishing device disclosed in the patent document requires a separate permanent magnet to extinguish the arc. Since the circuit breaker is used continuously, there is a concern that the arc-extinguishing ability may deteriorate if the magnetic force decreases or the permanent magnet is damaged by the generated arc.

[0011] KR 10 1 986 552 B1 discloses an arc extinguishing device for an air-insulated DC circuit breaker. Specifically, the patent document discloses the arc extinguishing device for an air-insulated DC circuit breaker that can extinguish the generated arc using an arc guide and a sealing element arranged adjacent to one end of a grid.

[0012] However, in the arc extinguishing device disclosed in the patent document, the arc guide is arranged only at a portion adjacent to the fixed contact point. Therefore, the patent document cannot provide a solution that can partially guide the arc from the fixed contact point and extinguish all arcs that are extended according to the movement of the movable contact point.

[0013] Furthermore, the patent documents cannot provide a solution for providing additional energy to extinguish the arc even when interrupting a small current instead of a large current. KR 10 1 031 975 B1 (May 9, 2011) KR 10 1 986 552 B1 (June 7, 2019) [Revelation][Technical Problem]

[0014] The present disclosure has been made in view of the above-mentioned problem, and has as its object to provide an arc extinguishing device having a structure capable of providing the energy required to extinguish a generated arc.

[0015] Another object of the present disclosure is to provide an arc extinguishing device having a structure capable of effectively extinguishing a generated arc even when the energy of the arc is low.

[0016] Yet another object of the present disclosure is to provide an arc extinguishing device having a structure capable of guiding a generated arc to a position suitable for extinguishing the arc.

[0017] Yet another object of the present disclosure is to provide an arc extinguishing device having a structure capable of extinguishing a generated arc without requiring excessive design modification.

[0018] Yet another object of the present disclosure is to provide an arc extinguishing device having a structure capable of maximizing an arc extinguishing effect by means of various modifications.

[0019] Technical problems to be solved by the present disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned above may become clear from the following descriptions to those skilled in the art to which the present disclosure refers. [Technical solution]

[0020] One aspect of the present disclosure provides an arc extinguishing device comprising: a grid member positioned close to an external fixed contact point and a movable contact point to extinguish an arc generated when the fixed contact point and the movable contact point are separated; and an arc guide coupled to the grid member and configured to produce a gas by reacting with the generated arc, wherein the grid member comprises: a grid body configured to define a body of the grid member and arranged to be spaced apart from the fixed contact point and the movable contact point; a grid arm provided continuously with the grid body and extending toward the fixed contact point and the movable contact point;and an arc expansion space defined by being partially surrounded by the grid body and the grid arm, and configured to receive the movable contact point such that the movable contact point is movable, and wherein the arc guide is coupled to the grid arm and arranged to partially surround the arc expansion space to produce a gas by means of heat from the generated arc;

[0021] Here, the grid body may extend in a different direction than the grid arm, and the grid arm may include: a first grid arm positioned close to one side of the grid body based on an extension direction; and a second grid arm positioned close to the other side of the grid body based on the extension direction and arranged to face the first grid arm with the arc expansion space disposed therebetween.

[0022] Additionally, the arc guide may include: a first arc guide coupled to the first grid arm; and a second arc guide coupled to the second grid arm and arranged to face the first arc guide with the arc expansion space disposed therebetween.

[0023] In this case, the arc guide may comprise: an inner arc guide coupled to the grid arm; and an outer arc guide configured to receive the inner arc guide and exposed to the arc expansion space.

[0024] In addition, the outer arc guide can be made of an outgassing material that produces a gas using heat from the generated arc.

[0025] In this case, the outer arc guide can be made of one or more of nylon, melamine, PA46, PA66, polyamide (PA) plastic, methyl methacrylate (MMA), polyoxymethylene (POM) plastic and polybutylene terephthalate (PBT).

[0026] In addition, the inner arc guide can be made of an arc-resistant material.

[0027] In this case, the inner arc guide can be made of a bulk molding compound (BMC) material.

[0028] In addition, the inner arc guide may include: a grid receiving portion recessed into an upper surface directed toward the grid member for receiving the grid arm; and a guide rib partially surrounding the grid receiving portion along its length for supporting the received grid arm.

[0029] In this case, the mesh member may be provided as a plurality of mesh members, the plurality of mesh members may be spaced apart from each other in one direction and arranged in parallel, the mesh receiving portion may be provided as a plurality of mesh receiving portions, the guide rib may be provided as a plurality of guide ribs, and the plurality of mesh receiving portions and the plurality of guide ribs may be arranged alternately in one direction.

[0030] In addition, the outer arc guide may include: an outer space configured to accommodate the inner arc guide; and a plurality of outer surfaces configured to surround the outer space in a plurality of directions and provided continuously with each other, and a side of the outer space directed toward the grid arm may be open.

[0031] In this case, the outer arc guide may include: an outer space configured to receive the inner arc guide and elongated in one direction; a first outer surface configured to surround the outer space at one end based on a direction; a second outer surface provided continuously with the first outer surface and configured to surround the outer space at one side of the grid arm based on an extension direction; and a third outer surface provided continuously with the second outer surface and configured to surround the outer space at the other end based on a direction.

[0032] In addition, the outer arc guide may include a fourth outer surface provided continuously with the first outer surface, the second outer surface, and the third outer surface, and configured to surround the outer space on one side of the grid body based on a width direction.

[0033] In this case, the inner arc guide may be provided as a pair of inner arc guides, the outer arc guide may be provided as a pair of outer arc guides, the pair of inner arc guides may be respectively received in the outer spaces respectively provided in the pair of outer arc guides, and the pair of inner arc guides may be arranged to face each other with the pair of fourth outer surfaces respectively provided in the pair of outer arc guides interposed therebetween.

[0034] In addition, the arc extinguishing device may comprise: a side frame coupled to the grid part and the arc guide, wherein the side frame is coupled to the grid part at a plurality of points.

[0035] In this case, the grille part may have a plurality of grille coupling protrusions projecting from ends based on a width direction of the grille body and a width direction of the grille arm toward the side frame, and the side frame may have a plurality of grille coupling portions formed in and penetrating the side frame and configured to receive the plurality of grille coupling protrusions.

[0036] Additionally, the arc guide may include an outer mounting hole formed in an upper surface facing toward the side frame, and the side frame may include: a side mounting hole formed in the side frame, penetrating the side frame, and configured to correspond to the outer mounting hole; and a side mounting member configured to penetrate the side mounting hole and be inserted into the outer mounting hole. [Advantageous technical effects]

[0037] With the above configuration, the arc extinguishing device according to an embodiment of the present disclosure can provide the energy required to extinguish the generated arc.

[0038] The generated arc is extinguished while being stretched, divided, and cooled as it passes through the multiple grid sections. The grid section includes a grid body configured to substantially perform the arc extinguishing process, and a grid arm provided continuous with the grid body and extending outward. An arc guide is coupled to the grid arm.

[0039] The arc guide comprises an inner arc guide directly coupled to the grid arm and an outer arc guide configured to surround the inner arc guide and exposed to the outside. The outer arc guide is made of a material, i.e., an outgassing material capable of producing a gas through heat. When the arc is generated, the outer arc guide produces a gas through heat generated along with the arc.

[0040] The gas produced is generated in the area where the arc is generated. This means that the area where the arc is generated has a higher pressure than the space in which the grid body is positioned or the outside of the arc extinguishing device. The generated arc moves toward the grid part due to the pressure difference.

[0041] Therefore, it is possible to provide the energy so that the generated arc extends and spreads towards the grid part.

[0042] In addition, with the above configuration, the arc extinguishing device according to an embodiment of the present disclosure can effectively extinguish the arc even when the energy of the generated arc is low.

[0043] As described above, the outer arc guide produces a gas using heat generated along with the arc. The pressure difference generated by the produced gas exerts a transfer force to move the generated arc toward the grid part and the outside of the arc extinguishing device.

[0044] Therefore, even if the energy of the generated arc is low, the pressure exerted by the gas can easily move or expand the arc toward the grid part and the outside of the arc-extinguishing device. As a result, the generated arc can be effectively extinguished even when a small current is applied to the arc-extinguishing device and the circuit breaker with the arc-extinguishing device.

[0045] In addition, with the above configuration, the arc extinguishing device according to an embodiment of the present disclosure can guide the generated arc to a position suitable for extinguishing the arc.

[0046] The arc tends to spread toward a tip. The inner arc guide is coupled to the grid arm, which defines the tip among the grid components. The inner arc guide can be made of an arc-resistant material and prevents the arc from spreading.

[0047] Therefore, the arc entering the grid part can propagate to the grid part positioned adjacent to the grid body formed in a plate shape. Therefore, it is possible to improve the effect of dividing and cooling the arc compared to a case where the arc propagates through the grid arm to another grid part.

[0048] As a result, the arc extinguishing effect can be improved.

[0049] In addition, with the above configuration, the arc extinguishing device according to an embodiment of the present disclosure can extinguish the generated arc without excessive modification of the design.

[0050] The arc guide comprises the outer arc guide, which is positioned outwardly and is configured to produce a gas by means of heat, and the inner arc guide, which is accommodated in the outer arc guide and is directly coupled to the grid arm.

[0051] Therefore, the single arc guide can perform all the functions of providing energy to the arc, isolating the multiple grid parts, and allowing the arc to propagate in the grid body.

[0052] The arc guide is coupled to a side frame and a guide arm. A side mounting hole is formed in the side frame, and an outer mounting hole is formed in the arc guide. A side mounting element penetrates the side mounting hole and is inserted into the outer mounting hole. Therefore, the arc guide can be coupled to the side frame.

[0053] A grid receiving section is embedded in the inner arc guide. The grid arm is inserted into the grid receiving section and coupled to it. Therefore, the arc guide and the grid part can be coupled.

[0054] Therefore, no excessive design modification is required to provide arc guidance. Therefore, arc guidance can be applied to a prior art product to improve its productivity.

[0055] In addition, with the above configuration, the arc extinguishing device according to an embodiment of the present disclosure can maximize the arc extinguishing effect by means of various modifications.

[0056] In one embodiment, the arc guide can be provided with an additional element. Like the outer arc guide, the additional element can be made of an outgassing material and configured to produce additional gas using heat from the arc. Alternatively, the additional element can be made of an arc-resistant material, like the inner arc guide, thereby improving the insulation performance between the multiple grid parts.

[0057] Therefore, it is possible to further improve the arc guiding effect by modifying the arc guidance in various ways.

[0058] The technical effects of the present disclosure are not limited to the above-mentioned effects, and it is understood that the technical effects of the present disclosure include all technical effects that can be derived from the detailed description of the present disclosure or the appended claims. [Brief description of the drawings] Fig. 1 is a perspective view illustrating an arc extinguishing device according to an embodiment of the present disclosure. Fig. Fig. 2 is a cross-sectional view along AA showing an embodiment of the arc extinguishing device of Fig. 1 illustrates. Fig. 3 is a cross-sectional view along BB showing the configuration of the arc extinguishing device of Fig. 1 illustrates. Fig. 4 is an exploded perspective view showing the configuration of the arc extinguishing device of Fig. 1 illustrates. Fig. 5 is a side view illustrating a side frame used in the arc extinguishing device of Fig. 1 is provided. Fig. 6 is a perspective view illustrating a support body of a frame support used in the arc extinguishing device of Fig. 1 is provided. Fig. Figure 7 is a plan view illustrating the support plate used in the frame support of Fig. 6 is provided. Fig. Fig. 8 is a perspective view illustrating a mesh plate used in the frame beam of Fig. 6 is provided. Fig. 9 is a plan view illustrating a cover frame used in the arc extinguishing device of Fig. 1 is provided. Fig. 10 is a perspective view illustrating a grid member used in the arc extinguishing device of Fig. 1 is provided. Fig. 11 is a bottom plan view showing a grid part made of Fig. 10 illustrates. Fig. 12 is a front view showing the grid part of Fig. 10 illustrates. Fig. 13 is a perspective view illustrating an arc guide plate used in the arc extinguishing device of Fig. 1 is provided. Fig. 14 is an exploded perspective view illustrating an arc guide used in the arc extinguishing device of Fig. 1 is provided. Fig. 15 is a right side view showing the arc guide from Fig. 14 illustrates. Fig. 16 is a left side view showing the arc guide from Fig. 14 illustrates. Fig. 17 to Fig. 19 are in-use views illustrating a process for operating the arc extinguishing device according to an embodiment of the present disclosure. [Best Embodiment]

[0059] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present disclosure pertains can easily carry out the embodiments. The present disclosure can be implemented in various ways and is not limited to the embodiments described herein. In the drawings, irrelevant parts are omitted for clarity of the present disclosure, and the same or similar constituent elements are denoted by the same reference numerals throughout the specification.

[0060] Terms or words used in the specification and claims should not be construed as being limited to a generic or dictionary-like meaning, but should be construed as having a meaning and concept consistent with the technical spirit of the present disclosure, based on the principle that an inventor can reasonably define a concept of a term to best describe his or her own invention.

[0061] Therefore, the embodiments disclosed in the present specification and the configurations illustrated in the drawings are exemplary embodiments of the present disclosure and do not represent the entire technical spirit of the present disclosure. Accordingly, it is understood that various equivalents and modified examples capable of replacing the embodiments are possible on the filing date.

[0062] In the following description, the description of some constituent elements may be omitted in order to clarify the features of the present disclosure. 1. Definitions of terms

[0063] The term "connection" used in the following description means that one or more elements are connected to one another in such a way that a fluid connection can be implemented. In one embodiment, the connection can be implemented by elements such as conduits, pipes, tubes, and the like. The term "connection" in the following description may be used to mean that one or more elements are "fluidically connected" to one another.

[0064] The terms "electrical conduction" used in the following description mean that one or more elements are connected to each other such that the elements can transmit electrical current or an electrical signal to each other. In one embodiment, the electrical conduction may be implemented in a wired manner through a conductive wire element or the like, or in a wireless manner through Bluetooth, Wi-Fi, RFID, or the like. In one embodiment, "electrical conduction" may also have a meaning of "connection."

[0065] The term "fluid" used in the following description refers to any form of material that can flow and change shape, volume, or the like under the influence of an external force. In one embodiment, the fluid may be a liquid, such as water, or a gas, such as air.

[0066] In the following description, the terms “upper side”, “lower side”, “left side”, “right side”, “front side” and “rear side” may be used with reference to the Fig. 1 illustrated coordinate system can be understood. 2. Description of the configuration of an arc extinguishing device 10 according to an embodiment of the present disclosure

[0067] Fig. 1 to Fig. 4 illustrate an arc extinguishing device 10 according to the embodiment of the present disclosure. The arc extinguishing device 10 according to the illustrated embodiment is provided in a circuit breaker (not illustrated) that allows electrical conduction between an external power source and an external load. The arc extinguishing device 10 can discharge and extinguish an arc that occurs when a fixed contact point and a movable contact point are separated to the outside of the circuit breaker (not illustrated).

[0068] In one embodiment, the arc-extinguishing device 10 may be provided in the circuit breaker (not illustrated) in which a small current flows. Therefore, the arc-extinguishing device 10 according to the embodiment of the present disclosure includes components that are different from components provided in the circuit breaker (not illustrated) in which a large current flows. The different components are described below.

[0069] In the illustrated embodiment, the arc extinguishing device 10 includes side frames 100, a support frame 200, a cover frame 300, grid members 400, an arc deflector 500, and arc guides 600. The components of the arc extinguishing device 10 will be described in detail below with reference to the accompanying drawings, and the arc guide 600 will be described separately. (1) Description of the side frame 100

[0070] The side frame 100 defines a portion of an outer shape of the arc extinguishing device 10. The side frame 100 is coupled to other components of the arc extinguishing device 10, namely the support frame 200, the cover frame 300, the grid part 400, the arc deflector 500, and the arc guide 600. The side frame 100 supports the support frame 200, the cover frame 300, the grid part 400, the arc deflector 500, and the arc guide 600.

[0071] The side frame 100 is coupled to the support frame 200. In the illustrated embodiment, an upper end of the side frame 100 is coupled to the support frame 200.

[0072] The side frame 100 is coupled to the cover frame 300. In the illustrated embodiment, the upper end of the side frame 100 is indirectly coupled to the cover frame 300 through the support frame 200.

[0073] The side frame 100 is coupled to the grid part 400. In the illustrated embodiment, an inner portion of the side frame 100 is coupled to one end of the grid part 400 based on a width direction.

[0074] The side frame 100 is coupled to the arc deflector 500. In the illustrated embodiment, a rear side portion of the side frame 100 is coupled to the arc deflector 500.

[0075] The side frame 100 is coupled to the arc guide 600. In the illustrated embodiment, an inner portion of a lower side of the side frame 100 is coupled to the arc guide 600.

[0076] The side frames 100 may be provided as a plurality of side frames 100. The plurality of side frames 100 may be spaced apart from one another and coupled to the components of the arc extinguishing device 10 at different positions. In the illustrated embodiment, the side frames 100 are provided as two side frames 100, including a first side frame 100a located on a left side and a second side frame 100b located on a right side.

[0077] The first side frame 100a is coupled to a left portion of the aforementioned arc extinguishing device 10. The second side frame 100b is coupled to a right portion of the aforementioned arc extinguishing device 10. The grid member 400, the arc deflector 500, and the arc guide 600 are positioned between the first side frame 100a and the second side frame 100b.

[0078] The first side frame 100a and the second side frame 100b have different positions but identical structures and functions. Therefore, the first side frame 100a and the second side frame 100b, which will be described together below, are collectively referred to as "the side frame 100."

[0079] In the Fig. 4 to Fig. 5, the side frame 100 includes a side body 110, frame support coupling portions 120, grid coupling portions 130, arc baffle coupling portions 140, side mounting holes 150, and side mounting members 160.

[0080] The side body 110 defines a body of the side frame 100. The side body 110 is coupled to other components of the arc extinguishing device 10.

[0081] The side body 110 may have any shape capable of coupling with and supporting other components of the arc extinguishing device 10. In the illustrated embodiment, the side body 110 is provided in a plate shape having a height in an up / down direction, a width in a forward / backward direction, and a thickness in a left / right direction.

[0082] One end of the side body 110 based on a height direction, ie, an upper end in the illustrated embodiment, may be formed to have a smaller width than the other side of the side body 110 based on the height direction, ie, a middle portion and a lower side in the illustrated embodiment. One end, ie, the upper end, of the side body 110 is coupled to the support frame 200.

[0083] The other side of the side body 110 based on the height direction, ie, the middle portion in the illustrated embodiment, is coupled to the grid part 400 and the arc guide plate 500. Another end of the side body 110 based on the height direction, ie, the lower end in the illustrated embodiment, is coupled to the arc guide 600.

[0084] In the side body 110, the frame support coupling portion 120, the grid coupling portion 130, the arc guide plate coupling portion 140, and the side fixing hole 150 are formed.

[0085] The frame beam coupling portion 120 is a portion where the side body 110 is coupled to the support frame 200. The frame beam coupling portion 120 is formed in a thickness direction of the side body 110, that is, the left / right direction in the illustrated embodiment. Frame beam coupling tabs 214 of the support frame 200 are inserted and coupled into the frame beam coupling portion 120.

[0086] The frame beam coupling portion 120 may have any shape capable of accommodating the corresponding frame beam coupling tab 214. In the illustrated embodiment, the frame beam coupling portion 120 is a space with a rectangular cross-section in which a length in the forward / backward direction is longer than a length in the upward / downward direction. The shape of the frame beam coupling portion 120 may vary depending on the shape of the frame beam coupling tab 214.

[0087] The frame beam coupling portion 120 is formed through the side body 110. In this case, the frame beam coupling portion 120 may be positioned close to a side of the portion of the side body 110 facing toward the support frame 200, ie, close to an upper end in the illustrated embodiment.

[0088] The frame beam coupling portions 120 may be provided as a plurality of frame beam coupling portions 120. The plurality of frame beam coupling portions 120 may be arranged at different positions and each coupled to a corresponding plurality of frame beam coupling lugs 214 formed at different positions. In the illustrated embodiment, two frame beam coupling portions 120 are formed and each positioned near a front side end and a rear side end of the upper end of the side body 110.

[0089] The number of frame beam coupling sections 120 and the method for arranging the frame beam coupling sections 120 may vary depending on the number of frame beam coupling tabs 214 and the method for arranging the frame beam coupling tabs 214.

[0090] The grid coupling sections 130 are formed below the frame support coupling sections 120.

[0091] The grating coupling portion 130 is a portion where the side body 110 is coupled to the grating part 400. The grating coupling portion 130 is formed in the thickness direction of the side body 110, ie, the left / right direction in the illustrated embodiment. The grating coupling tabs 450 of the grating part 400 are inserted into the grating coupling portions 130 and coupled.

[0092] The grating coupling portion 130 may have any shape capable of accommodating the corresponding grating coupling tab 450. In the illustrated embodiment, the grating coupling portion 130 comprises a space with a rectangular cross-section in which a length in the up / down direction is longer than a length in the forward / backward direction. The shape of the grating coupling portion 130 may vary depending on the shape of the grating coupling tab 450.

[0093] The grid coupling portion 130 is formed through the side body 110. In this case, the grid coupling portions 130 may be positioned at a central portion of the portion of the side body 110.

[0094] The grating coupling sections 130 can be grouped into multiple groups. The various grating coupling tabs 450 can be inserted into and coupled to the grating coupling sections 130 of the multiple groups. In the illustrated embodiment, the grating coupling sections 130 are grouped into three groups, including first grating coupling sections 131, second grating coupling sections 132, and third grating coupling sections 133.

[0095] The first grating coupling portions 131, the second grating coupling portions 132, and the third grating coupling portions 133 may be provided as a plurality of first grating coupling portions 131, a plurality of second grating coupling portions 132, and a plurality of third grating coupling portions 133. In the illustrated embodiment, the first to third grating coupling portions 131, 132, and 133 each have ten through-holes arranged to be spaced apart from each other in the forward / backward direction.

[0096] First grating coupling tabs 451 are inserted into and coupled with the first grating coupling portions 131. The first grating coupling portions 131 are positioned at an uppermost side among the grating coupling portions 130 of the plurality of groups.

[0097] Each of the first grating coupling portions 131 extends to be inclined at a predetermined angle with respect to a vertical direction. In the illustrated embodiment, the first grating coupling portion 131 extends to be inclined toward a rear upper side and a front lower side.

[0098] The second grating coupling sections 132 are positioned below the first grating coupling sections 131.

[0099] Second grating coupling tabs 452 are inserted into and coupled with the second grating coupling portions 132. The second grating coupling portions 132 are positioned between the first grating coupling portions 131 and the third grating coupling portions 133 in the up / down direction of the side body 110.

[0100] The second grating coupling portion 132 extends so as to be inclined at a predetermined angle with respect to the vertical direction. In the illustrated embodiment, the second grating coupling portion 132 extends so as to be inclined toward the rear upper side and the front lower side.

[0101] The third grating coupling sections 133 are positioned below the second grating coupling sections 132.

[0102] Third grating coupling tabs 453 are inserted into and coupled with the third grating coupling portions 133. The third grating coupling portions 133 are positioned below the second grating coupling portions 132 in the up / down direction of the side body 110. In other words, the third grating coupling portions 133 are positioned at a lowermost side below the grating coupling portions 130.

[0103] The third grating coupling portion 133 extends so as to be inclined at a predetermined angle with respect to the vertical direction. In the illustrated embodiment, the third grating coupling portion 133 extends so as to be inclined toward the rear upper side and the front lower side.

[0104] The number of the first to third grating coupling portions 131, 132, and 133, the method of arranging the first to third grating coupling portions 131, 132, and 133, and the shapes of the first to third grating coupling portions 131, 132, and 133 may vary depending on the number of grating coupling tabs 451, 452, and 453 of the grating part 400, the method of arranging the grating coupling tabs 451, 452, and 453, and the shapes of the grating coupling tabs 451, 452, and 453.

[0105] The arc guide plate coupling portion 140 is formed on one side, ie, on the rear side in the illustrated embodiment, based on a direction in which the plurality of grid coupling portions 130 are arranged in parallel.

[0106] The arc guide plate coupling portion 140 is a portion where the side body 110 is coupled to the arc guide plate 500. The arc guide plate coupling portion 140 is formed in the thickness direction of the side body 110, that is, the left / right direction in the illustrated embodiment. Arc guide plate tabs 520 of the arc guide plate 500 are inserted into the respective arc guide plate coupling portion 140 and coupled.

[0107] The arc baffle coupling portion 140 may have any shape capable of accommodating the corresponding arc baffle nose 520. In the illustrated embodiment, the arc baffle coupling portion 140 is a space with a rectangular cross-section in which a length in the up / down direction is longer than a length in the forward / backward direction. The shape of the arc baffle coupling portion 140 may vary depending on the shape of the arc baffle nose 520.

[0108] The arc guide plate coupling portion 140 is formed through the side body 110. In this case, the arc guide plate coupling portion 140 may be positioned so that it is close to one end of the side body 110 based on a longitudinal direction, ie, close to the rear side end in the illustrated embodiment.

[0109] The arc guide coupling portion 140 may be provided as a plurality of arc guide coupling portions 140. The plurality of arc guide coupling portions 140 may be arranged to be spaced apart from each other and each coupled to a corresponding one of the plurality of arc guide tabs 520. In the illustrated embodiment, two arc guide coupling portions 140 are formed and arranged to be spaced apart from each other in the height direction of the side body 110, that is, the up / down direction. The number of arc guide coupling portions 140 and the method for arranging the arc guide coupling portions 140 may vary depending on the number of arc guide tabs 520 and the method for arranging the arc guide tabs 520.

[0110] The side mounting holes 150 are formed below the grid coupling portions 130.

[0111] The side mounting hole 150 is a portion where the side body 110 is coupled to the frame support 200 and the arc guide 600. The side mounting hole 150 is formed in the thickness direction of the side body 110, that is, the left / right direction in the illustrated embodiment. The side mounting members 160, which penetrate the first support mounting holes 271a of the frame support 200 and the outer mounting holes 616 of the arc guide 600, are inserted into the side mounting holes 150 and coupled.

[0112] In one embodiment, the side mounting hole 150 may be coupled to the side mounting member 160 by screwing. In one embodiment, a screw thread may be formed on an inner periphery of the side mounting hole 150.

[0113] The side mounting hole 150 may be provided singly or in multiple locations. A first side mounting element 161 may be coupled to one of the one or more side mounting holes 150 and couple the frame support 200 and the side frame 100. Second side mounting elements 162 may each be coupled to one or more other of the plurality of side mounting holes 150 and couple the arc guide 600 and the side frame 100.

[0114] In the illustrated embodiment, the side mounting holes 150 include a first side mounting hole 151 and one or more second side mounting holes 152.

[0115] The first side mounting hole 151 is coupled to the first side mounting member 161, which is configured to couple the side body 110 and the frame support 200. The first side mounting hole 151 is positioned near a side of the portion of the side body 110 facing toward the support frame 200, that is, toward the upper end in the illustrated embodiment.

[0116] The first side mounting hole 151 may be positioned close to the frame rail coupling portion 120. In the illustrated embodiment, the first side mounting hole 151 is positioned between the pair of frame rail coupling portions 120.

[0117] The first side mounting hole 151 may have any shape capable of being coupled to the first side mounting member 161 in such a way as to be penetrated thereby. In the illustrated embodiment, the first side mounting hole 151 has a cylindrical shape having a circular cross-section and a thickness in the left / right direction.

[0118] The second side mounting hole 152 is coupled to the second side mounting element 162, which is configured to couple the side body 110 and the arc guide 600. The second side mounting hole 152 is positioned near the other side of the portion of the side body 110 that faces toward the arc guide 600, ie, toward the lower end in the illustrated embodiment.

[0119] The second side mounting hole 152 may be provided as a plurality of second side mounting holes 152. The plurality of second side mounting holes 152 may be arranged at different positions and each coupled to a corresponding one of the plurality of second side mounting holes 152. In the illustrated embodiment, the second side mounting holes 152 are provided as a pair of second side mounting holes 152 and are each positioned near the front side end and the rear side end of the side body 110.

[0120] The number of second side mounting holes 152 and the method for arranging the second side mounting holes 152 may vary depending on the number of outer mounting holes 616 of the arc guide 600 and the number of second side fasteners 162.

[0121] The side fastener 160 couples the side body 110 to the frame support 200 and the arc guide 600. The side fastener 160 can penetrate the side body 110 and be inserted and coupled into the frame support 200 and the arc guide 600.

[0122] The side fastening element 160 may have any shape capable of coupling the side body 110 to the frame support 200 and the arc guide 600. In the illustrated embodiment, the side fastening element 160 may be provided as a screw element and coupled to the side body 110, the frame support 200, and the arc guide 600 by screwing.

[0123] The side fastening element 160 may be provided as a plurality of side fastening elements 160. One of the plurality of side fastening elements 160 may couple the side body 110 and the frame support 200. Another of the plurality of side fastening elements 160 may couple the side body 110 and the arc guide 600.

[0124] In the illustrated embodiment, the side fastening element 160 includes the first side fastening element 161 and the second side fastening element 162.

[0125] The first side fastening element 161 penetrates the first side fastening hole 151 and is coupled to one or more first support fastening holes 217a of the frame support 200. The first side fastening element 161 couples the side body 110 and the frame support 200.

[0126] The second side fastening element 162 penetrates the second side fastening hole 152 and is coupled to the outer fastening hole 616 of the arc guide 600. The second side fastening element 162 couples the side body 110 and the arc guide 600.

[0127] The second side fastening element 162 may be provided as a plurality of second side fastening elements 162. The plurality of second side fastening elements 162 may be coupled to a respective one of the plurality of second side fastening holes 152 and the outer fastening holes 616. In the illustrated embodiment, the second side fastening elements 162 are provided as a pair of second side fastening elements 162 and are respectively coupled to the plurality of second side fastening holes 152 and the plurality of outer fastening holes 616. (2) Description of the frame support 200

[0128] The frame support 200 couples the side frame 100 and the cover frame 300. A space is formed in the frame support 200, defining a path along which a generated arc is extinguished and discharged. A member for filtering foreign substances and the like mixed with the extinguished arc may be provided in the space of the frame support 200.

[0129] The frame support 200 is coupled to the side frame 100. In the embodiment where the side frames 100 are provided as a pair of side frames 100 including the first side frame 100a and the second side frame 100b, the frame support 200 can be coupled to the first and second side frames 100a and 100b. In the illustrated embodiment, left and right portions of the frame support 200 can be coupled to upper portions of the side frames 100.

[0130] The frame support 200 is coupled to the cover frame 300. The upper portion of the frame support 200 and the compartment are arranged to be covered by the cover frame 300. Therefore, the elements accommodated in the compartment can be prevented from accidentally slipping out. The compartment can be connected to the outside via the cover frame 300.

[0131] In the Fig. 6 to Fig. In the embodiment shown in Figure 8, the frame support 200 comprises a support body 210, a support plate 220 and one or more mesh plates 230.

[0132] The support body 210 defines a body of the frame support 200. The support body 210 is a portion where the frame support 200 is coupled to other components of the arc extinguishing device 10. In particular, the support body 210 is coupled to the side frame 100 and the cover frame 300.

[0133] A space is formed in the support body 210. The support plate 220 and the mesh plate 230 are positioned in the space. The mesh part 400 is positioned below the space. A top surface of the space communicates with the outside of the cover frame 300. Thus, the space in which the mesh part 400 is accommodated communicates with the outside of the cover frame 300, allowing the generated arc to be extinguished and discharged.

[0134] The support body 210 can have any shape that is coupled to the side frame 100 and the cover frame 300 and allows an interior of the arc extinguishing device 10 to communicate with the outside. In the illustrated embodiment, the support body 210 has a quadrangular column shape with a quadrangular cross-section and a height in the up / down direction. In this case, a space is formed in the support body 210 that is formed in the height direction, that is, the up / down direction.

[0135] In the illustrated embodiment, the carrier body 210 includes a plate receiving portion 211, a plate supporting portion 212, a buffer space 213, the frame carrier coupling lugs 214, grid supporting portions 215, cover frame supporting portions 216, carrier mounting holes 217, and a gripping notch 218.

[0136] The plate receiving portion 211 receives the support plate 220 and the mesh plate 230. The plate receiving portion 211 defines a portion of the space formed in the support body 210. In the illustrated embodiment, the plate receiving portion 211 defines an upper space of the space in the support body 210.

[0137] The plate receiving portion 211 may be formed in a shape corresponding to a shape of the support plate 220 and a shape of the mesh plate 230. In the illustrated embodiment, the plate receiving portion 211 is formed as a space with a rectangular cross-section in which a length in the forward / backward direction is longer than a length in the left / right direction, and the plate receiving portion 211 has a quadrangular column shape with a height in the up / down direction.

[0138] One side of the portion of the plate receiving portion 211 facing toward the cover frame 300, ie, the upper side in the illustrated embodiment, is open. The support plate 220 and the mesh plate 230 are received by one side in the plate receiving portion 211.

[0139] The other side of the portion of the plate-receiving portion 211 facing toward the grid part 400, ie, the lower side in the illustrated embodiment, is open. The arc generated in the grid part 400 can propagate through the other side to the plate-receiving portion 211.

[0140] The disk support section 212 is positioned below the disk receiving section 211.

[0141] The plate support portion 212 supports the support plate 220 and the mesh plate 230, which are accommodated in the plate receiving portion 211. Additionally, the plate support portion 212 surrounds an outer side of the buffer space 213 along its length. In other words, the plate support portion 212 is configured such that a cross-sectional area of ​​the buffer space 213 is smaller than a cross-sectional area of ​​the plate receiving portion 211.

[0142] Therefore, the support plate 220 and the mesh plate 230 accommodated in the plate accommodating portion 211 are supported by the plate supporting portion 212 and are prevented from arbitrarily entering the buffer space 213.

[0143] The disk support portion 212 protrudes inward from an inner peripheral surface of the support body 210. The disk support portion 212 extends along an inner periphery of the support body 210.

[0144] The disk support portion 212 may be divided into multiple portions. In the illustrated embodiment, the disk support portion 212 may be divided into a pair of portions arranged in the forward / backward direction and extending in the left / right direction, and a pair of portions arranged in the left / right direction and extending in the forward / backward direction. In this case, the first bracket mounting holes 217a are formed through the pair of portions of the disk support portion 212.

[0145] The space surrounded by the plate support portion 212 is defined as the buffer space 213.

[0146] The buffer space 213 defines another portion of the space formed in the support body 210. In the illustrated embodiment, the buffer space 213 defines a lower space of the space in the support body 210.

[0147] The buffer space 213 is positioned between the plate receiving portion 211 and the grid member 400. The buffer space 213 is formed in the height direction of the support frame 200, that is, the up / down direction in the illustrated embodiment.

[0148] One side of the portion of the buffer space 213 facing toward the disk receiving portion 211, ie, the upper side in the illustrated embodiment, is open and communicates with the disk receiving portion 211. The other side of the portion of the buffer space 213 facing toward the grid part 400, ie, the lower side in the illustrated embodiment, is open and communicates with the grid part 400.

[0149] Therefore, the arc extinguished while passing through the grid member 400 can be discharged to the outside through the buffer space 213 and the plate receiving portion 211 sequentially.

[0150] The frame support coupling lug 214 is a portion where the support body 210 is coupled to the side body 110. The frame support coupling lug 214 is inserted and coupled into the frame support coupling portion 120 of the side frame 100.

[0151] The frame carrier coupling lug 214 is positioned on an outer peripheral surface of the carrier body 210. The frame carrier coupling lug 214 protrudes outward from the carrier body 210.

[0152] The frame rail coupling tab 214 may have any shape suitable for insertion into the frame rail coupling portion 120. In the illustrated embodiment, the frame rail coupling tab 214 extends in the forward / backward direction and has a width in the left / right direction and a height in the up / down direction.

[0153] In this case, the frame beam coupling lug 214 may be formed to have a cross-sectional area that varies in the height direction. In the illustrated embodiment, the frame beam coupling lug 214 is formed such that a cross-sectional area of ​​an upper side thereof is larger than a cross-sectional area of ​​a lower side thereof. In other words, an upper surface of an outer side of the frame beam coupling lug 214 extends in such a way that it is inclined toward a lower inner side.

[0154] Therefore, the frame beam coupling lug 214 can be easily inserted and coupled into the corresponding frame beam coupling portion 120. In addition, the frame beam coupling lug 214, which is inserted into the corresponding frame beam coupling portion 120, is prevented from arbitrarily slipping out of the frame beam coupling portion 120 without the application of an external force.

[0155] The frame beam coupling tab 214 may be provided as a plurality of frame beam coupling tabs 214. The plurality of frame beam coupling tabs 214 may be arranged to be spaced apart from one another, located at different positions, and coupled to a respective one of the plurality of frame beam coupling portions 120.

[0156] In the illustrated embodiment, a total of four frame support coupling lugs 214 are provided, such that the pair of frame support coupling lugs 214 are provided on a left outer surface and a right outer surface of the support body 210, respectively. In this case, the pairs of frame support coupling lugs 214 formed on the left outer surface and the right outer surface of the support body 210, respectively, are arranged such that they are spaced apart from each other in the forward / backward direction.

[0157] The number of frame beam coupling tabs 214 and the method for arranging the frame beam coupling tabs 214 may vary depending on the number of frame beam coupling sections 120 and the method for arranging the frame beam coupling sections 120.

[0158] The lattice girder section 215 is positioned close to the frame girder coupling nose 214.

[0159] The grid support portion 215 supports the grid member 400 in the arrangement direction, ie, in the front / back direction in the illustrated embodiment. The grid support portion 215 supports the grid member 400 on one side based on the extension direction, ie, on the top side in the illustrated embodiment.

[0160] The grid support portion 215 is provided on the support body 210. The grid support portion 215 is positioned on a side of the support body 210 facing toward the grid part 400, ie, on the bottom side in the illustrated embodiment.

[0161] The lattice beam sections 215 may be provided as a plurality of lattice beam sections 215. The plurality of lattice beam sections 215 may be positioned at ends based on a direction in which the plurality of lattice parts 400 are arranged in parallel. In the illustrated embodiment, the lattice beam sections 215 include a first lattice beam section 215a positioned at the front side and a second lattice beam section 215b positioned at the rear side.

[0162] The first lattice beam portion 215a is positioned at the front of the support body 210. The first lattice beam portion 215a defines one side of the support body 210 based on the longitudinal direction, ie, the front side in the illustrated embodiment.

[0163] The first lattice support portion 215a partially surrounds the plate receiving portion 211 and the buffer space 213. In the illustrated embodiment, the first lattice support portion 215a surrounds the plate receiving portion 211 and the front side of the buffer space 213. In other words, the first lattice support portion 215a defines the front side of the support body 210.

[0164] In this case, the first grid support portion 215a may include a rib (no reference numeral) extending toward the plate receiving portion 211 or the buffer space 213. The rib (no reference numeral) is configured to support a first grid 400a provided in the grid part 400.

[0165] The first lattice beam portion 215a faces the second lattice beam portion 215b, with the plate receiving portion 211 and the buffer space 213 disposed therebetween.

[0166] The second lattice beam portion 215b is positioned at a rear side of the support body 210. The second lattice beam portion 215b defines the other side of the support body 210 based on the longitudinal direction, ie, the rear side in the illustrated embodiment.

[0167] The second lattice support portion 215b partially surrounds the plate receiving portion 211 and the buffer space 213. In the illustrated embodiment, the second lattice support portion 215b surrounds the plate receiving portion 211 and the rear side of the buffer space 213. In other words, the second lattice support portion 215b defines the rear side of the support body 210.

[0168] The cover frame support portion 216 supports the cover frame 300, which is coupled to the frame support 200. The cover frame support portion 216 can prevent the cover frame 300, which is coupled to the frame support 200, from pivoting or slipping out.

[0169] The cover frame support portion 216 defines one of the sides of the support body 210 that faces toward the cover frame 300, ie, the top side in the illustrated embodiment. The cover frame support portion 216 extends in the direction in which the support body 210 is elongated, ie, in the forward / backward direction in the illustrated embodiment. In the illustrated embodiment, the cover frame support portion 216 protrudes upward from an upper surface of the support body 210.

[0170] The cover frame support portion 216 may be provided as a plurality of cover frame support portions 216. The plurality of cover frame support portions 216 may be spaced apart from one another and support the cover frame 300 at different positions. In the illustrated embodiment, the cover frame support portions 216 are provided as a pair of cover frame support portions 216 and are formed on the left and right sides of the support body 210, respectively.

[0171] The pair of cover frame support sections 216 can be arranged to face each other with the plate receiving section 211 disposed therebetween. The pair of cover frame support sections 216 supports two opposite sides of the cover frame 300. In the illustrated embodiment, the pair of cover frame support sections 216 supports the left and right sides of the cover frame 300.

[0172] The carrier mounting hole 217 is a portion where the frame carrier 200 is coupled to another component. The side fastener 160 and the cover fasteners 350 are coupled to the carrier mounting hole 217.

[0173] The support mounting holes 217 are recessed into or formed through the support body 210. The support mounting hole 217 can be formed in any shape to which the side mounting element 160 or the respective cover mounting element 350 can be coupled.

[0174] The support mounting holes 217 may be grouped into multiple groups. The first side mounting member 161, which couples the side frame 100 and the support body 210, may be coupled to any group among the support mounting holes 217 of the multiple groups. The cover mounting member 350, which couples the support body 210 to the cover frame 300, may be coupled to another group among the support mounting holes 217 of the multiple groups.

[0175] In the illustrated embodiment, the carrier mounting holes 217 include the first carrier mounting holes 217a and second carrier mounting holes 217b.

[0176] The first side fastening member 161, which couples the side body 110 and the support body 210, is coupled to the first support fastening hole 217a. The first support fastening holes 217a are formed in the thickness direction through the pair of longer outer peripheral portions below the outer peripheral portions of the support body 210, that is, the left and right outer peripheral portions in the illustrated embodiment.

[0177] The first side fastening element 161 can be inserted into and coupled to the first support mounting hole 217a. In one embodiment, the first side fastening element 161 can be coupled to the first support mounting hole 217a by screwing. In one embodiment, a screw thread can be formed on an outer periphery of the first support mounting hole 217a.

[0178] The first support mounting hole 217a may be provided as a plurality of first support mounting holes 217a. The plurality of first support mounting holes 217a may be formed in the plurality of outer peripheral portions of the support body 210, respectively. In the illustrated embodiment, the first support mounting holes 217a are provided as a pair of first support mounting holes 217a and are formed through the left and right outer peripheral portions of the support body 210.

[0179] In this case, the first support fixing hole 217a may extend to the disk support portion 212 formed in the support body 210. Therefore, the first support fixing holes 217a may allow the buffer space 213 and a radially outer side of the support body 210 to communicate with each other.

[0180] The cover fastening element 350, which couples the support body 210 and the cover frame 300, is coupled to the second support fastening hole 217b. The second support fastening hole 217b is formed through or recessed into a surface of the support body 210 facing toward the cover frame 300, ie, the upper surface in the illustrated embodiment.

[0181] The cover fastening element 350 can be inserted into the second support mounting hole 217b and coupled. In one embodiment, the cover fastening element 350 can be coupled to the respective support mounting hole 217b by screwing. In one embodiment, a screw thread can be formed on an outer periphery of the second support mounting hole 217b.

[0182] The second support mounting hole 217b may be provided as a plurality of second support mounting holes 217b. The plurality of second support mounting holes 217b may each be formed at different positions on the upper surface of the support body 210. In the illustrated embodiment, four second support mounting holes 217b are provided and positioned near each corner of the upper surface of the support body 210.

[0183] The support plate 220 allows the space in which the mesh part 400 is positioned to partially communicate with the exterior of the arc extinguishing device 10. The support plate 220 supports a bottom surface of the mesh plate 230.

[0184] The support plate 220 is accommodated in the plate receiving portion 211. In this case, the outer periphery of the support plate 220 is supported by the plate support portion 212, and the support plate 220 does not move toward the buffer space 213.

[0185] The support plate 220 may be formed in a shape corresponding to a cross-sectional shape of the plate receiving portion 211. In the illustrated embodiment, the support plate 220 has a quadrangular plate shape and has a cross-section with a protruding portion formed at one end based on the extension direction and a depressed portion formed at the other end based on the extension direction. The support plate 220 is formed to have a thickness in the up / down direction.

[0186] The support plate 220 supports the mesh plate 230 at the bottom. With the support plate 220, the mesh plate 230 does not move toward the buffer space 213.

[0187] In the Fig. In the embodiment illustrated in Figure 7, the support plate 220 has support connection holes 221 and a plate notch 222.

[0188] The support connection holes 221 are formed in and penetrate the support plate 220, allowing the space in which the mesh part 400 is positioned to partially communicate with the outside of the arc extinguishing device 10. The arc generated and extinguished in the mesh part 400 can be discharged to the outside sequentially through the support connection holes 221 and the mesh plate 230.

[0189] The support connection hole 221 may be provided as a plurality of support connection holes 221. The plurality of support connection holes 221 may be spaced apart from each other, arranged at different positions, and configured to allow the space in which the mesh part 400 is positioned to communicate with the outside. In the illustrated embodiment, the plurality of support connection holes 221 are positioned close to the front side, so that they face the arc guide plate 500 positioned at the rear side. This serves to increase the internal pressure of the generated initial arc, so that the generated arc is quickly stretched and introduced into the arc extinguishing device 10.

[0190] Specifically, the fixed contact point and the movable contact point are positioned so that they oppose the arc guide plate 500. In this case, the support connection hole 221 is not formed in a portion of the support plate 220 positioned above the fixed contact point and the movable contact point. Therefore, the portion between the support connection holes 221, the fixed contact point, and the movable contact point is partially sealed, allowing the pressure of the generated initial arc to be rapidly increased.

[0191] The plate notch 222 is recessed into an edge of the other end of the support plate 220 based on the extension direction. An operator can insert a finger, a tool, or the like into the plate notch 222 and easily pull out the support plate 220.

[0192] The mesh plate 230 is configured to filter out foreign substances and the like remaining in the extinguished and discharged arc. The mesh plate 230 prevents the foreign substances remaining in the arc from being randomly discharged to the outside of the arc-extinguishing device 10. Therefore, it is possible to prevent other components of the arc-extinguishing device 10 or the circuit breaker (not illustrated) from being damaged by the foreign substances and the like.

[0193] The mesh plate 230 is received in the plate receiving portion 211. In this case, the mesh plate 230 is arranged to cover the support plate 220 and be supported by the support plate 220.

[0194] The mesh plate 230 can be accommodated in the plate receiving portion 211 and provided in any shape suitable for filtering out foreign substances and the like remaining in the arc. In the illustrated embodiment, the mesh plate 230 is formed in a square plate shape corresponding to the support plate 220.

[0195] The mesh plate 230 may be provided as a plurality of mesh plates 230. The plurality of mesh plates 230 may be stacked in the thickness direction and filter out foreign substances and the like remaining in the arc passing through the plurality of mesh plates 230. In the illustrated embodiment, six mesh plates 230 are provided and stacked in the up / down direction. Therefore, the arc passing through the mesh plates 230 can be filtered multiple times and discharged to the outside of the arc extinguishing device 10.

[0196] In one embodiment, the mesh plate 230, positioned at a lowermost side, is supported by the support plate 220. The mesh plate 230, positioned at a topmost side, is covered by the cover frame 300.

[0197] In the Fig. In the embodiment illustrated in Figure 8, the mesh plate 230 has mesh through-holes 231 and mesh ribs 232.

[0198] The mesh through-holes 231 are formed through the mesh plate 230 in the thickness direction and define passages through which the arc can pass. The mesh through-hole 231 is defined by being surrounded by the mesh ribs 232.

[0199] The mesh through-hole 231 may have any shape that can allow the arc to pass through the mesh through-hole 231 and prevent foreign substances and the like remaining in the arc from passing through the mesh through-hole 231. In the illustrated embodiment, the mesh through-hole 231 is a space having a quadrangular column shape with a quadrangular cross-section and a height in the up / down direction.

[0200] The mesh through-hole 231 is surrounded by the mesh ribs 232. The mesh ribs 232 are provided as a plurality of mesh ribs 232 extending in the longitudinal direction and the width direction of the mesh plate 230. In this case, the mesh ribs 232 extending in the same direction are spaced apart from each other, and the mesh through-holes 231 are formed between the mesh ribs 232.

[0201] The mesh through-holes 231 are provided as a plurality of mesh through-holes 231, and the mesh ribs 232 are provided as a plurality of mesh ribs 232. The plurality of mesh through-holes 231 and the plurality of mesh ribs 232 may be arranged alternately in the longitudinal direction and the width direction of the mesh plate 230.

[0202] In addition, the plurality of mesh through-holes 231 and the plurality of mesh ribs 232 formed in the plurality of stacked mesh plates 230 may be arranged alternately in the stacking direction, ie, the up / down direction in the illustrated embodiment.

[0203] Therefore, the arc that has passed through the mesh through-holes 231 formed in any one mesh plate 230 can propagate in a horizontal direction and then pass through the mesh through-holes 231 formed in another mesh plate 230. Therefore, it is possible to improve the effect of filtering out foreign substances and the like remaining in the arc. (3) Description of the cover frame 300

[0204] The cover frame 300 is coupled to the frame support 200, thereby covering the frame support 200. The cover frame 300 supports the support plate 220 and the mesh plates 230 provided in the frame support 200 from above. Although pressure or the like is generated when a disconnection operation is performed, the cover frame 300 can prevent the support plate 220 and the mesh plate 230 from arbitrarily slipping out.

[0205] The cover frame 300 is coupled to the frame support 200. A plurality of through holes (i.e., the cover through holes 320 to be described below) are formed in the cover frame 300 so that the interior of the support body 210 (i.e., the plate receiving portion 211 and the buffer space 213) communicates with the outside. Therefore, the arc extinguished while passing through the mesh part 400 can be discharged to the outside sequentially through the frame support 200 and the cover frame 300.

[0206] In the Fig. 4 and Fig. 9, the cover frame 300 includes a cover body 310, the cover through holes 320, cover ribs 330, cover fixing holes 340, and the cover fixing members 350.

[0207] The cover body 310 defines a body of the cover frame 300. The cover body 310 may be formed in a shape corresponding to the support body 210 and coupled to the support body 210 while covering the space formed in the support body 210. In the illustrated embodiment, the cover body 310 is formed to have a polygonal cross-section in which a length in the front / back direction is longer than a length in the left / right direction, and the cover body 310 is formed to have a thickness in the up / down direction.

[0208] The cover body 310 is provided with cover through holes 320 and cover ribs 330. Additionally, the cover fixing holes 340 are arranged near edges of the cover body 310.

[0209] The cover through-holes 320 are formed in the cover body 310 and allow the interior of the support body 210 to communicate with the outside. The arc that has passed through the support plate 220 and the mesh plate 230 housed in the support body 210 can pass through the cover through-holes 320 and be discharged to the outside of the arc extinguishing device 10.

[0210] Each cover through-hole 320 is formed through the cover body 310 in the thickness direction, ie, the up / down direction in the illustrated embodiment. One end of the cover through-hole 320 based on the penetration direction, ie, the top side in the illustrated embodiment, is open and communicates with the outside. The other end of the cover through-hole 320 based on the penetration direction, ie, the bottom side in the illustrated embodiment, is open and communicates with the interior of the support body 210.

[0211] The cover through-hole 320 is surrounded by the cover ribs 330. The cover ribs 330 extend in the longitudinal direction and the width direction of the cover body 310, that is, the front / backward direction and the left / right direction in the illustrated embodiment, and the cover ribs 330 are bordered in the horizontal direction.

[0212] The cover through-hole 320 may have any shape suitable for allowing the interior of the support body 210 to communicate with the exterior of the arc-extinguishing device 10. In the illustrated embodiment, the cover through-hole 320 is formed as a space having a quadrangular plate shape with a quadrangular cross-section and a thickness in the up-down direction.

[0213] The cover through-hole 320 may be provided as a plurality of cover through-holes 320, and the cover ribs 330 may be provided as a plurality of cover ribs 330. The plurality of cover through-holes 320 and the plurality of cover ribs 330 may be arranged alternately in the longitudinal direction and the width direction of the cover body 310.

[0214] In the illustrated embodiment, a total of nine cover through-holes 320 are formed, such that the cover through-holes 320 are formed in three rows in the forward / backward direction and the cover through-holes 320 are formed in three rows in the left / right direction. The cover ribs 330 extend side by side between the cover through-holes 320.

[0215] The cover fixing hole 340 is a portion to which a fixing member is coupled, which couples the cover frame 300 to another component of the switch (not illustrated) and the frame support 200. The cover fixing hole 340 is formed through the cover body 310 in the thickness direction, ie, the up / down direction in the illustrated embodiment.

[0216] The cover fastening hole 340 may be provided as a plurality of cover fastening holes 340. The plurality of cover fastening holes 340 may be formed at different positions, and the plurality of fastening elements may penetrate the cover body 310. In one embodiment, the cover fastening hole 340 may be coupled to the fastening element by screwing. In one embodiment, a screw thread may be formed on an inner periphery of the cover fastening hole 340.

[0217] In the illustrated embodiment, the cover mounting holes 340 include first cover mounting holes 341 and second cover mounting holes 342.

[0218] The fastening element that couples the arc-extinguishing device 10 to the circuit breaker (not illustrated) is coupled to the first cover fastening hole 341. The first cover fastening hole 341 is formed through the cover body 310 in the thickness direction, ie, the up / down direction in the illustrated embodiment.

[0219] The first cover fixing hole 341 may be provided as a plurality of first cover fixing holes 341. The plurality of first cover fixing holes 341 may be formed at different positions. In the illustrated embodiment, two first cover fixing holes 341 are formed and positioned close to ends, ie, the front side end and the rear side end, of the cover body 310 based on the longitudinal direction.

[0220] The cover fastening member 350, which couples the cover frame 300 to the frame support 200, is coupled to the second cover fastening hole 342. The second cover fastening hole 342 is formed through the cover body 310 in the thickness direction, ie, the up / down direction in the illustrated embodiment.

[0221] The second cover mounting hole 342 may be provided as a plurality of second cover mounting holes 342. The plurality of second cover mounting holes 342 may be formed at various positions. In the illustrated embodiment, four second cover mounting holes 342 are formed and positioned near corners of the cover body 310.

[0222] The cover fastening element 350 couples the cover frame 300 to the frame carrier 200. The cover fastening element 350 is coupled to and penetrates the cover fastening hole 340.

[0223] The cover fastening member 350 may be provided in any form capable of coupling the cover frame 300 to the frame support 200. In one embodiment, the cover fastening member 350 may be provided as a screw member having a screw thread formed on an outer periphery thereof.

[0224] The cover fastening element 350 may be provided as a plurality of cover fastening elements 350. The plurality of cover fastening elements 350 may couple the cover frame 300 to the frame carrier 200.

[0225] In the illustrated embodiment, four cover fastening members 350 are provided and coupled to the four second cover fastening holes 342 and the second carrier fastening holes 217b, respectively. (4) Description of the grid part 400

[0226] The mesh part 400 extinguishes the arc generated when the fixed contact point and the movable contact point are separated in a state where an electric current flows. The generated arc is cooled, stretched, moved along the mesh part 400, split, and discharged to the outside of the arc-extinguishing device 10. Therefore, it can be said that the mesh part 400 essentially serves to extinguish the arc.

[0227] The grid part 400 is coupled to the side frame 100. One end of the grid part 400 based on the width direction is supported by the pair of side frames 100a and 100b.

[0228] The grid part 400 is partially received in the support frame 200. In the illustrated embodiment, an upper surface of the grid part 400 is partially received in the buffer space 213 of the support frame 200.

[0229] The grid part 400 is coupled to the arc guide 600. The generated arc can be provided with sufficient energy by the arc guide 600 and can be stretched, divided, and extinguished in spaces defined between the multiple grid parts 400.

[0230] The mesh part 400 may be provided as a plurality of mesh parts 400. The plurality of mesh parts 400 may be spaced apart from each other and arranged in parallel in a direction of movement of the movable contact point, ie, the forward / backward direction in the illustrated embodiment. The generated arc may be divided, cooled, and extinguished while passing through the spaces defined between the plurality of mesh parts 400.

[0231] The grid part 400 may be divided into a plurality of grids depending on its shape. The plurality of grid parts 400 may be arranged such that they are spaced apart from each other in the aforementioned direction, ie, in the forward / backward direction.

[0232] In the Fig. 10 to Fig. 12, the grating parts 400 include three types of gratings, including the first grating 400a, second grating 400b, and third grating 400c.

[0233] The first grid 400a is arranged at a side end based on a direction in which the plurality of grid parts 400 are arranged in parallel, ie, at the front end in the illustrated embodiment. The first grid 400a is arranged so that it is closest to the fixed contact point.

[0234] The second grille 400b and the third grille 400c are positioned behind the first grille 400b. In this case, the second grille 400b and the third grille 400c are arranged alternately in the direction in which the plurality of grille parts 400 are arranged in parallel, ie, in the illustrated embodiment, at the front.

[0235] That is, the first grating 400a is provided as a single first grating 400a, the second gratings 400b are provided as a plurality of second gratings 400b, the third gratings 400c are provided as a plurality of third gratings 400c, and the plurality of second gratings 400b and the plurality of third gratings 400c are arranged alternately in the arrangement direction.

[0236] The practical advantage of distinguishing between the first grating 400a and the second and third gratings 400b and 400c lies in the shape difference between grating arms 420, which are described below.

[0237] That is, as in Fig. As illustrated in FIG. 12, the grating arm 420 of the first grating 400a is formed to be smaller than the grating arm 420 of each of the second and third gratings 400b and 400c. Specifically, the grating arm 420 of the first grating 400a is shorter in width (i.e., a length in the left / right direction) and extension length (i.e., a length in the up / down direction) than those of the second and third gratings 400b and 400c.

[0238] Therefore, it is possible to ensure a sufficient space in which the movable contact point and a movable contact point base (MR) are moved, and it is also possible to ensure a sufficient space in which the arc guide 600 is coupled.

[0239] The first to third gratings 400a, 400b, and 400c are different in the shapes of the aforementioned grating arms 420 and identical in other structures and functions. Therefore, the first to third gratings will be collectively described as the grating part 400 below.

[0240] In the Fig. 10 to Fig. 12, the grid part 400 has a grid body 410, the grid arms 420, an arc guide space 430, an arc expansion space 440, and the grid coupling tabs 450.

[0241] The grid body 410 defines a body of the grid part 400. The grid body 410 essentially serves to divide, cool and extinguish the arc.

[0242] The mesh body 410 is provided in a plate shape. In the illustrated embodiment, the mesh body 410 is provided in a quadrangular plate shape in which a length in the left / right direction is longer than a length in the up / down direction.

[0243] The grid body 410 is provided continuously with the grid arm 420. In the illustrated embodiment, a lower side of the grid body 410 is provided continuously with an upper side of the grid arm 420.

[0244] The grid body 410 partially surrounds the arc guiding space 430 and the arc expansion space 440. Specifically, in the illustrated embodiment, the grid body 410 of the first grid 400a surrounds an upper side of the arc expansion space 440. The grid body 410 of each of the second and third grids 400b and 400c surrounds the arc guiding space 430 and the upper side of the arc expansion space 440.

[0245] The first and second grating coupling tabs 451 and 452 of the grating coupling tabs 450 are provided at ends of the grating body 410 based on the width direction.

[0246] The grid arm 420 is provided continuously with the grid body 410. The grid arm 420 extends from a lower end of the grid body 410 and partially surrounds the arc guiding space 430 or the arc expansion space 440.

[0247] The grid arm 420 is coupled to the arc guide 600. The arc guide 600, which is coupled to the grid arm 420, can be coupled to and supported by the side frame 100.

[0248] The grid arm 420 may be provided as a plurality of grid arms 420. The plurality of grid arms 420 may be spaced apart from each other, arranged at different positions, and coupled to the grid body 410. In the illustrated embodiment, the pair of grid arms is provided and includes a first grid arm 421 provided on a left side and a second grid arm 422 positioned on a right side.

[0249] The first and second grid arms 421 and 422 are arranged to be spaced apart from each other in the width direction of the grid body 410, that is, the left / right direction. In other words, the first and second grid arms 421 and 422 are arranged to face each other, with the arc guide space 430 or the arc expansion space 440 interposed therebetween.

[0250] As described above, the pair of grating arms 420 provided on the first grating 400a is smaller in width and extension length than the pair of grating arms 420 provided on each of the second and third gratings 400b and 400c.

[0251] The pair of grid arms 420 provided on the first grid 400a are arranged to face each other, with the arc expansion space 440 interposed therebetween. The pair of grid arms 420 provided on each of the second and third grids 400b and 400c are arranged to face each other, with the arc guide space 430 and the arc expansion space 440 interposed therebetween.

[0252] The third grating coupling lugs 453 of the grating coupling lugs 450 are formed on the outer edges of the grating arms 420.

[0253] The arc guiding space 430 guides the arc generated when the fixed contact point and the movable contact point are separated to the grid body 410 or the space between the grid bodies 410.

[0254] The arc guiding chamber 430 is partially surrounded by the grid body 410 and the grid arms 420. In the illustrated embodiment, the top of the arc guiding chamber 430 is partially surrounded by the grid body 410, and the left and right sides of the arc guiding chamber 430 are partially surrounded by the pair of grid arms 420.

[0255] With reference to Fig. 12, the arc guide space 430 is formed in each of the second and third grids 400b and 400c. The arc guide space 430 is recessed on a side of the edge of the grid body 410 opposite the support frame 200 or the cover frame 300, ie, a lower edge in the illustrated embodiment.

[0256] In this case, the arc guiding spaces 430 formed in the second and third grids 400b and 400c may be formed at different positions.

[0257] That is, as in Fig. As illustrated in Figure 12, a first arc guide space 431 formed in the second grid 400b is positioned close to the first grid arm 421. In other words, the first arc guide space 431 formed in the second grid 400b is positioned close to the left side.

[0258] In addition, a second arc guide space 432 formed in the third grid 400c is positioned close to the second grid arm 422. In other words, the second arc guide space 432 formed in the third grid 400c is positioned close to the right side.

[0259] Therefore, the generated arc can be alternately guided in the width direction of the mesh part 400 and guided to the mesh body 410 or the space between the mesh bodies 410. Therefore, the process of extinguishing the generated arc can be effectively performed.

[0260] The arc expansion space 440 is a space in which the movable contact point base (MR) moves. The arc generated between the movable contact point and the fixed contact point is stretched along the movable contact point base (MR) and guided to the grid body 410 or the space between the grid bodies 410.

[0261] The arc expansion space 440 is partially surrounded by the grid body 410 and the grid arm 420. In the illustrated embodiment, the top of the arc expansion space 440 is surrounded by the grid body 410, and the left and right sides of the arc expansion space 440 with respect to the width direction are surrounded by the grid arm 420.

[0262] The arc expansion space 440 communicates with the arc guide space 430. The arc extending in the arc expansion space 440 can be guided through the arc guide space 430 to the grid body 410 or the space between the grid bodies 410.

[0263] The grille coupling tab 450 is a portion where the grille part 400 is coupled to the side frame 100. The grille coupling tab 450 is inserted into and coupled to the grille coupling portion 130 formed in the side frame 100.

[0264] The grating coupling tab 450 is provided continuously with the grating body 410 and the grating arm 420. The grating coupling tabs 450 protrude outward from the grating body 410 and the ends of the grating arms 420 based on the width direction, ie, the left and right edges in the illustrated embodiment.

[0265] The grating coupling tab 450 may be provided as a plurality of grating coupling tabs 450. The plurality of grating coupling tabs 450 may each be coupled to the plurality of grating coupling portions 130. In the illustrated embodiment, the grating coupling tabs 450 include three types of grating coupling tabs, including the first grating coupling tabs 451, the second grating coupling tabs 452, and the third grating coupling tabs 453.

[0266] The first grating coupling tabs 451 are inserted into the first grating coupling portion 131 and coupled. The first grating coupling tabs 451 are positioned at an uppermost side among the plurality of grating coupling tabs 450. The first grating coupling tabs 451 protrude outward from two opposite edges of the grating body 410.

[0267] The second grating coupling tabs 452 are inserted into the second grating coupling section 132 and coupled. The second grating coupling tabs 452 are positioned among the plurality of grating coupling tabs 450 in a lateral intermediate section. The second grating coupling tabs 452 protrude outward from two opposite edges of the top surfaces of the grating arms 420.

[0268] The third grating coupling tabs 453 are inserted into the third grating coupling portion 133 and coupled. The third grating coupling tabs 453 are positioned at a lowermost side among the plurality of grating coupling tabs 450. The third grating coupling tabs 453 protrude outward from two opposite edges of the bottom surfaces of the grating arms 420.

[0269] The number of grating coupling tabs 450, the shape of the grating coupling tab 450, and the method for arranging the grating coupling tabs 450 may vary depending on the number of grating coupling sections 130, the shape of the grating coupling section 130, and the method for arranging the grating coupling sections 130. (5) Description of the arc guide plate 500

[0270] The arc guide plate 500 guides the arc generated when the fixed contact point and the movable contact point are separated to the arc guide space 430. The arc guide plate 500 is positioned farthest from a downstream side of the generated arc, that is, the fixed contact point. In the illustrated embodiment, the arc guide plate 500 is positioned at a rear side of the arc extinguishing device 10 and positioned close to the mesh part 400, which is positioned at a rearmost side among the plurality of mesh parts 400.

[0271] The arc guide plate 500 is coupled to the side frame 100. Two opposite sides of the arc guide plate 500 based on the width direction are supported by the pair of side frames 100a and 100b.

[0272] In the Fig. In the embodiment illustrated in Figure 13, the arc guide plate 500 comprises an arc guide plate body 510, the arc guide plate noses 520 and an arc guide element 530.

[0273] The arc baffle body 510 defines a body of the arc baffle 500. The arc baffle body 510 is provided continuously with another component of the arc baffle 500. The arc baffle body 510 partially overlaps the grid part 400, which is positioned at the rearmost side among the plurality of grid parts 400.

[0274] The arc guide body 510 may have any shape suitable for being provided continuously with another component of the arc guide body 500 and for guiding the arc. In the illustrated embodiment, the arc guide body 510 is provided in a square plate shape in which a length in the left / right direction is longer than a length in the up / down direction.

[0275] The arc guide tabs 520 are formed at ends of the arc guide body 510 based on the longitudinal direction, ie, at the left end and the right end.

[0276] The arc baffle nose 520 is inserted and coupled into the arc baffle coupling portion 140 of the side frame 100. Through the above-mentioned coupling, the arc baffle 500 can be coupled to the side frame 100 and supported by the side frame 100.

[0277] The arc baffle nose 520 is provided continuously with the arc baffle body 510. The arc baffle noses 520 protrude outwardly from the ends of the arc baffle body 510 based on the longitudinal direction, ie, the left end and the right end in the illustrated embodiment.

[0278] The arc guide tab 520 may be provided as a plurality of arc guide tabs 520. The plurality of arc guide tabs 520 may be provided at various positions continuously with the arc guide body 510. In addition, the plurality of arc guide tabs 520 may each be coupled to the plurality of arc guide coupling sections 140.

[0279] In the illustrated embodiment, a total of four arc guide tabs 520 are formed, such that a pair of arc guide tabs 520 are provided on the left side and a pair of arc guide tabs 520 are provided on the right side. In this case, the pair of arc guide tabs 520 are arranged such that they are spaced apart from each other in the height direction of the arc guide body 510, that is, in the up / down direction in the illustrated embodiment.

[0280] The number of arc baffle tabs 520 and the method for arranging the arc baffle tabs 520 may vary depending on the number of arc baffle coupling sections 140 and the method for arranging the arc baffle coupling sections 140. 3. Description of the arc guide 600 according to an embodiment of the present disclosure

[0281] With further reference to Fig. 1 to Fig. 4, the arc extinguishing device 10 according to an embodiment of the present disclosure includes the arc guide 600.

[0282] In the case of the circuit breaker (not illustrated) where a small current flows, the arc generated when the fixed contact point and the movable contact point are separated has lower energy than in the case of a large current. Therefore, in the case of the arc generated while a small current flows, energy must be provided to assist in moving and stretching the arc.

[0283] Therefore, the arc guide 600 according to the embodiment of the present disclosure is configured to provide energy for stretching and moving the generated arc. Additionally, the arc guide 600 can prevent damage to the grid part 400 caused by the generated arc and allow the guided arc to be cooled, divided, and extinguished while being stretched along the plurality of grid parts 400.

[0284] The arc guide 600 is coupled to the side frame 100. Specifically, the second side mounting member 162 penetrates the second side mounting hole 152 and the outer mounting hole 616 of the arc guide 600 and couples the arc guide 600 to the side frame 100.

[0285] The arc guide 600 is coupled to the grid part 400. Specifically, the grid arms 420 are inserted and coupled into inner arc guides 620 of the arc guides 600. Therefore, damage to the grid arm 420 caused by the arc can be prevented, and the guided arc can be effectively extinguished while flowing along the grid body 410.

[0286] The arc guide 600 may be provided as a plurality of arc guides 600. The plurality of arc guides 600 may be coupled to the plurality of side frames 100 and the plurality of grid arms 420, respectively. Fig. 14 to Fig. 16, the arc guides 600 include two arc guides including a first arc guide 600a positioned on the left side and a second arc guide 600b positioned on the right side.

[0287] The first arc guide 600a is coupled to the first side frame 100a and the first grid arms 421. The second arc guide 600b is coupled to the second side frame 100b and the second grid arms 422.

[0288] The first arc guide 600a and the second arc guide 600b may be formed symmetrically in the vertical direction. The first arc guide 600a and the second arc guide 600b are partially different in their arrangement position and direction, but identical in structure and function. Therefore, in the following description, the first arc guide 600a and the second arc guide 600b are collectively referred to as the arc guide 600.

[0289] The arc guide 600 may be divided into several components. Some of the several components that make up the arc guide 600 may be configured to provide energy to the generated arc. Some of the other components that make up the arc guide 600 may be configured to protect the several grid parts 400 and maintain an insulated state between the several grid parts 400.

[0290] In the Fig. 14 to Fig. In the embodiment illustrated in Figure 16, the arc guide includes outer arc guides 610 and inner arc guides 620.

[0291] The outer arc guide 610 defines a configuration of the arc guide 600. The outer arc guide 610 is coupled to the inner arc guide 620 while surrounding an outer side of the inner arc guide 620. That is, the outer arc guide 610 is a portion in which the arc guide 600 is exposed to the outside.

[0292] The outer arc guide 610 provides energy to assist in moving and extending the arc. Specifically, the outer arc guide 610 is made of a material that generates a gas using heat from the generated arc. The gas generated by the outer arc guide 610 generates pressure and provides a transfer force to move the generated arc toward the grid portion 400.

[0293] The outer arc guide 610 may be made of any material capable of generating a gas using heat or pressure. In one embodiment, the outer arc guide 610 may be made of any outgassing material, such as nylon, melamine, PA46, PA66, polyamide (PA) plastic, methyl methacrylate (MMA), polyoxymethylene (POM) plastic, or polybutylene terephthalate (PBT).

[0294] Some of the sides of the outer arc guide 610 may be open. In the illustrated embodiment, a top surface of the outer arc guide 610 is open, and the outer arc guide 610 serves as a passageway that receives the inner arc guide 620. Additionally, an outer side of the outer arc guide 610 is open and is covered by the side frame 100.

[0295] In the illustrated embodiment, the outer arc guide 610 has a first outer surface 611, a second outer surface 612, a third outer surface 613, a fourth outer surface 614, an outer space 615, and the outer mounting holes 616.

[0296] The first outer surface 611 defines a surface of the outer arc guide 610. In the illustrated embodiment, the first outer surface 611 defines a rear surface of the outer arc guide 610. The first outer surface 611 extends such that it is inclined with respect to the vertical direction. The first outer surface 611 surrounds the outer space 615 at the rear. The first outer surface 611 supports the inner arc guide 620, which is housed in the outer space 615, at the rear.

[0297] The second outer surface 612 defines another surface of the outer arc guide 610. In the illustrated embodiment, the second outer surface 612 defines a lower surface of the outer arc guide 610. The second outer surface 612 supports the inner arc guide 620 at the lower side, which is received in the outer space 615. The second outer surface 612 surrounds the outer space 615 at the lower side.

[0298] The second outer surface 612 extends at a predetermined angle relative to the first outer surface 611. In one embodiment, the second outer surface 612 may extend horizontally. The second outer surface 612 extends in the longitudinal direction of the outer arc guide 610, ie, in the forward / backward direction in the illustrated embodiment.

[0299] In one embodiment, the second outer surface 612 may extend over a length corresponding to the arranged plurality of grid parts 400.

[0300] The third outer surface 613 defines another surface of the outer arc guide 610. In the illustrated embodiment, the third outer surface 613 defines a front surface of the outer arc guide 610. The third outer surface 613 surrounds the outer space 615 at the front. The third outer surface 613 supports the inner arc guide 620 at the front, which is received in the outer space 615.

[0301] The third outer surface 613 extends at a predetermined angle with respect to the second outer surface 612. In one embodiment, the third outer surface 613 may extend vertically.

[0302] The fourth outer surface 614 defines another surface of the outer arc guide 610. In the illustrated embodiment, the fourth outer surface 614 defines an inner side surface of the outer arc guide 610. The fourth outer surface 614 surrounds the outer space 615. The fourth outer surface 614 supports the inner arc guide 620 received in the outer space 615.

[0303] Therefore, an inner side of the inner arc guide 620 accommodated in the outer space 615 is surrounded by the fourth outer surface 614, and an outer side of the inner arc guide 620 is surrounded by the side frame 100. That is, the fourth outer surface 614 is arranged to face the side frame 100, with the outer space 615 and the inner arc guide 620 accommodated in the outer space 615 interposed therebetween.

[0304] The fourth outer surface 614 is provided continuously with the first through third outer surfaces 611, 612, and 613. In one embodiment, the fourth outer surface 614 may be provided vertically continuously with the first through third outer surfaces 611, 612, and 613.

[0305] The outer space 615 is a space defined by being surrounded by the first through fourth outer surfaces 611, 612, 613, and 614. The outer space 615 accommodates the inner arc guide 620.

[0306] Some of the sides of the outer space 615 may be open. In the illustrated embodiment, the upper side of the outer space 615 and one side (i.e., an outer side) facing toward the side frame 100 are open.

[0307] The outer space 615 may be physically spaced from the space in which the arc is generated. That is, the outer space 615 and the inner arc guide 620 housed in the outer space 615 are physically separated by the first through fourth outer surfaces 611, 612, 613, and 614 and the side frame 100.

[0308] Therefore, it is possible to prevent a situation in which the generated arc enters the outer space 615 or is directly transmitted to the inner arc guide 620 accommodated in the outer space 615.

[0309] The second side attachment member 162, which couples the outer arc guide 610 to the side frame 100, is coupled to the outer attachment hole 616. The outer attachment hole 616 is recessed on a side facing toward the side frame 100 below the sides of the outer arc guide 610, ie, an outer edge in the illustrated embodiment.

[0310] In one embodiment, the outer mounting hole 616 may be coupled to the second side mounting member 162 by screwing. In one embodiment, a screw thread may be formed on an outer periphery of the outer mounting hole 616.

[0311] The outer mounting holes 616 may be provided as a plurality of outer mounting holes 616. The plurality of outer mounting holes 616 may be positioned proximate the ends of the outer arc guide 610 based on the extension direction. In the illustrated embodiment, the outer mounting holes 616 are provided as a pair of outer mounting holes 616, each positioned proximate the first outer surface 611 and the third outer surface 613.

[0312] The inner arc guide 620 defines another configuration of the arc guide 600. The inner arc guide 620 is housed in the outer arc guide 610 without being arbitrarily exposed to the outside. Therefore, it is possible to prevent damage to the inner arc guide 620 caused by the generated arc.

[0313] The inner arc guide 620 may be made of an insulating material or an arc-resisting material. This serves to move the arc, which is guided to the arc guide space 430, along the grid body 410 to the adjacent grid part 400.

[0314] In particular, the arc tends to propagate toward a tip. Therefore, in the case where the inner arc guide 620 is not provided or the inner arc guide 620 is made of a positively arc-conducting material, the arc can propagate to another grid part 400 through the grid arm 420 with an improved tip compared to the grid body 410.

[0315] In this case, there is a concern that the effect of cooling and dividing the arc may be deteriorated compared to a case where the arc propagates through the grid body 410 to another grid part 400. Therefore, the inner arc guide 620 made of an arc-resisting material may be provided so that the arc guided to the grid arm 420 can be minimized. As a result, the arc can propagate through the grid body 410 to another grid part 400, which can maximize the effect of cooling, dividing, and extinguishing the arc.

[0316] The inner arc guide 620 may be made of any material that exhibits arc resistance. In one embodiment, the inner arc guide 620 may be made of a bulk molding compound (BMC) material.

[0317] In the illustrated embodiment, the inner arc guide 620 includes a first inner surface 621, a second inner surface 622, a third inner surface 623, grid receiving portions 624, and guide ribs 625.

[0318] The first inner surface 621 defines a surface of the inner arc guide 620. In the illustrated embodiment, the first inner surface 621 defines a rear surface of the inner arc guide 620. The first inner surface 621 extends such that it is inclined with respect to the vertical direction. The first inner surface 621 can be formed to correspond to a shape of the first outer surface 611 and a shape of the outer mounting hole 616 formed proximate the first outer surface 611. The first inner surface 621 is supported by the first outer surface 611.

[0319] The second inner surface 622 defines another surface of the inner arc guide 620. In the illustrated embodiment, the second inner surface 622 defines a lower surface of the inner arc guide 620. The second inner surface 622 is provided continuous with the first inner surface 621 and forms a predetermined angle therewith. In one embodiment, the second inner surface 622 may be horizontal. The second inner surface 622 extends in the longitudinal direction of the inner arc guide 620, i.e., in the forward / backward direction in the illustrated embodiment.

[0320] The second inner surface 622 is supported by the second outer surface 612. The second inner surface 622 may be formed to conform to a shape of the second outer surface 612. In one embodiment, the second inner surface 622 may extend over a length equal to or longer than a length over which the plurality of grid parts 400 are arranged in parallel.

[0321] The third inner surface 623 defines another surface of the inner arc guide 620. In the illustrated embodiment, the third inner surface 623 defines a front surface of the inner arc guide 620. In one embodiment, the third inner surface 623 may be vertical.

[0322] The third inner surface 623 may be formed to conform to a shape of the third outer surface 613 and a shape of the outer mounting hole 616 formed proximate to the third outer surface 613. The third inner surface 623 is supported by the third outer surface 613.

[0323] The grid receiving portion 624 is a space that receives the grid arm 420 of the grid part 400. The grid receiving portion 624 is recessed into a side facing toward the grid part 400 below the sides of the inner arc guide 620, ie, into the upper surface in the illustrated embodiment.

[0324] The grid receiving portion 624 may extend such that it is inclined with respect to the vertical direction. In the illustrated embodiment, the grid receiving portion 624 extends such that it is inclined toward the front bottom and the rear top. An extension direction of the grid receiving portion 624 may vary depending on an extension angle of the grid arm 420.

[0325] One side facing toward the grille part 400 below the sides of the grille receiving portion 624 and the other side facing toward the side frame 100 may be open. In the illustrated embodiment, the top side of the grille receiving portion 624 and the outer side facing toward the side frame 100 are open.

[0326] The grid receiving portion 624 may be provided as a plurality of grid receiving portions 624. The plurality of grid receiving portions 624 may be arranged such that they are spaced apart from each other in the direction in which the inner arc guide 620 extends, that is, in the forward / backward direction in the illustrated embodiment. In the illustrated embodiment, a total of ten grid receiving portions 624 are formed and arranged such that they are spaced apart from each other. The number of grid receiving portions 624 and the method for arranging the grid receiving portions 624 may vary depending on the number of grid parts 400 and the method for arranging the grid parts 400.

[0327] The grid receiving sections 624 may be divided into multiple sections. In the illustrated embodiment, the grid receiving sections 624 may include a single first grid receiving section 624a positioned at the front and a plurality of second grid receiving sections 624b positioned behind the first grid receiving section 624a.

[0328] The first grid receiving portion 624a receives the grid arm 420 of the first grid 400a. The second grid receiving portions 624b receive the grid arms 420 of the second and third grids 400b and 400c.

[0329] The guide ribs 625 are positioned between the plurality of grid receiving sections 624.

[0330] The guide ribs 625 are formed between the plurality of grid receiving portions 624 and physically separate the grid receiving portions 624 that are arranged close to each other. Therefore, it is possible to prevent direct contact between the plurality of grid members 400 received in the grid receiving portions 624.

[0331] The guide rib 625 may be formed to correspond to a shape of the grid receiving portion 624 or a shape of the grid arm 420. In the illustrated embodiment, the guide rib 625 extends in such a way that it is inclined toward the front bottom and the rear top.

[0332] The plurality of grid receiving portions 624 and the plurality of guide ribs 625 are alternately arranged in the extending direction of the inner arc guide 620, that is, in the forward / backward direction in the illustrated embodiment.

[0333] In the illustrated embodiment, the single outer arc guide 610 made of an outgassing material and the single inner arc guide 620 made of an arc-resistant material are provided in each of the first arc guide 600a and the second arc guide 600b, respectively. Therefore, it is understood that the arc guide 600, which includes the first arc guide 600a and the second arc guide 600b, includes the pair of outer arc guides 610 and the pair of inner arc guides 620.

[0334] Alternatively, an additional component made of an outgassing material or an arc-resisting material may be further disposed between the outer arc guide 610 and the inner arc guide 620. 4. Description of a process for operating the arc extinguishing device 10 according to an embodiment of the present disclosure

[0335] The arc extinguishing device 10 according to an embodiment of the present disclosure can provide energy to the generated arc. The arc can be extinguished by being stretched by the energy and moved toward the grid part 400. Therefore, even if a small current flows in the arc extinguishing device 10 according to the embodiment of the present disclosure and the energy of a generated arc is low, the generated arc can be effectively extinguished.

[0336] In addition, the arc extinguishing device 10 can prevent a situation where the generated arc spreads to the grid arm 420 of the grid part 400. Therefore, the generated arc can move along the grid body 410 of the grid part 400 to another grid part 400. Therefore, the arc can be extinguished while being quickly cooled and divided.

[0337] Hereinafter, a process for extinguishing the arc generated in the arc extinguishing device 10 according to an embodiment of the present disclosure will be described with reference to Fig. 17 to Fig. 19 described in detail.

[0338] Fig. 17 illustrates a state in which the arc extinguishing device 10 according to an embodiment of the present disclosure is installed.

[0339] In this state, a contact point C is positioned between the pair of grid arms 420 and the pair of arc guides 600 coupled to the pair of grid arms 420. The arc guide plate 500 and the grid parts 400 are positioned above the contact point C.

[0340] Fig. 18 exemplifies a path (arc) for the arc stretched along the contact point C of the movable contact point base (MR) and propagated to the plurality of grid parts 400.

[0341] When the movable contact point base (MR) and the contact point C provided on the movable contact point base (MR) are separated from a fixed contact point base (FR) and the contact point C provided on the fixed contact point base (FR), an arc is generated and stretched between the contact points C. The stretched arc is extinguished by being divided and spreading to the plurality of mesh parts 400 and the spaces formed between the plurality of mesh parts 400.

[0342] In this case, the outer arc guide 610 coupled to the grid arm 420 produces a gas using heat generated along with the arc. The pressure generated by the produced gas provides a transfer force that moves the arc toward the plurality of grid parts 400 and the spaces formed between the plurality of grid parts 400.

[0343] Therefore, even in the case that the arc generated by a small current does not have sufficient energy, the arc can be quickly extinguished while passing through the mesh part 400 and being discharged to the outside.

[0344] Fig. 19 illustrates an example of a process in which the generated arc propagates on the single grid part 400.

[0345] As described above, the arc tends to propagate toward the tip. In this case, the arc guide 600 is coupled to the grid arm 420, which corresponds to the tip of the grid part 400, and prevents the generated arc from spreading. Additionally, the inner arc guide 620, which is coupled to the grid arm 420, can be made of an arc-resistant material and prevent the arc from spreading or damage caused by the arc.

[0346] Therefore, the arc entering the grid part 400 propagates along the grid body 410 but does not propagate to the grid arm 420. The arc propagating along the grid body 410 can be cooled, divided, and extinguished as it moves to the grid body 410 of the adjacent grid part 400.

[0347] While the embodiments of the present disclosure have been described, the spirit of the present disclosure is not limited to the embodiments shown in the present description, and those skilled in the art who understand the spirit of the present disclosure can easily propose other embodiments by adding, changing, and deleting constituent elements within the same spirit and scope of the present disclosure, and it can be said that such embodiments are also within the spirit and scope of the present disclosure. 10 Arc extinguishing device 100 page frames 100a first side frame 100b second side frame 110 side bodies 120 frame support coupling section 130 Grid coupling section 131 first grating coupling section 132 second grating coupling section 133 third grating coupling section 140 Arc guide plate coupling section 150 side mounting hole 151 first side mounting hole 152 second side mounting hole 160 side fastening element 161 first side fastening element 162 second side fastening element 200. Frame support 210 carrier bodies 211 Plate receiving section 212 Plate support section 213 Buffer room 214 Frame carrier coupling nose 215 lattice girder section 215a first lattice girder section 215b second lattice girder section 216 Cover frame support section 217 Carrier mounting hole 217a first support mounting hole 217b second carrier mounting hole 220 carrier plate 221 Beam connection hole 222 plate notch 230 mesh plate 231 mesh through hole 232 stitch rib 300 cover frames 310 cover body 320 cover through hole 330 cover rib 340 Cover mounting hole Cover mounting hole 341 first 342 second cover mounting hole 350 cover fastener 400 grid part 400a first grid 400b second grid 400c third grid 410 lattice body 420 lattice arm 421 first lattice arm 422 second lattice arm 430 Arc guide room 431 first arc guide room 432 second arc guide room 440 Arc expansion space 450 grid coupling nose 451 first grating coupling nose 452 second grating coupling nose 453 third grating coupling nose 500 arc guide plate 510 Arc deflector body 520 Arc guide plate nose 530 Arc guide element 600 arc guidance 600a first arc guide 600b first arc guide 610 external arc guide 611 first outer surface 612 second outer surface 613 third outer surface 614 fourth outer surface 615 outer space 616 outer mounting hole 620 inner arc guide 621 first inner surface 622 second inner surface 623 third inner surface 624 Grid receiving section 624a first grid receiving section 624b second grid receiving section 625 guide rib FR fixed contact point base MR movable contact point base C Contact point Arc path for arc QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] KR 10 1 031 975 B1 [0009, 0013] KR 10 1 986 552 B1 [0011, 0013]

Claims

[1] Arc extinguishing device comprising: a grid member positioned close to an external fixed contact point and a movable contact point to extinguish an arc generated when the fixed contact point and the movable contact point are separated; and an arc guide coupled to the grid part and configured to produce a gas by reacting with the generated arc, wherein the grid part comprises: a grid body configured to define a body of the grid part and arranged to be spaced apart from the fixed contact point and the movable contact point; a grid arm provided continuously with the grid body and extending toward the fixed contact point and the movable contact point; and an arc expansion space defined by being partially surrounded by the grid body and the grid arm, and adapted to receive the movable contact point so that the movable contact point is movable, and wherein the arc guide is coupled to the grid arm and is arranged such that it partially surrounds the arc expansion space in order to produce a gas by means of heat from the generated arc. [2] The arc extinguishing device according to claim 1, wherein the grid body extends in a different direction than the grid arm, and where the grid arm comprises: a first grid arm positioned close to one side of the grid body based on an extension direction; and a second grid arm positioned close to the other side of the grid body based on the extension direction and arranged to face the first grid arm with the arc expansion space disposed therebetween. [3] Arc extinguishing device according to claim 2, wherein the arc guide comprises: a first arc guide coupled to the first grid arm; and a second arc guide coupled to the second grid arm and arranged to face the first arc guide with the arc expansion space disposed therebetween. [4] The arc extinguishing device according to claim 1, wherein the arc guide comprises: an inner arc guide coupled to the grid arm; and an outer arc guide adapted to receive the inner arc guide and exposed to the arc expansion space. [5] The arc extinguishing device according to claim 4, wherein the outer arc guide is made of an outgassing material that produces a gas by means of heat from the generated arc. [6] The arc extinguishing device according to claim 5, wherein the outer arc guide is made of one or more of nylon, melamine, PA46, PA66, polyamide (PA) plastic, methyl methacrylate (MMA), polyoxymethylene (POM) plastic and polybutylene terephthalate (PBT). [7] The arc extinguishing device according to claim 4, wherein the inner arc guide is made of an arc resistance material. [8] The arc extinguishing device of claim 7, wherein the inner arc guide is made of a bulk molding compound (BMC) material. [9] An arc extinguishing device according to claim 4, wherein the inner arc guide comprises: a grid receiving portion recessed into an upper surface directed toward the grid member to receive the grid arm; and a guide rib which partially surrounds the grid receiving section in its extension in order to support the received grid arm. [10] The arc extinguishing device according to claim 9, wherein the mesh member is provided as a plurality of mesh members, the plurality of mesh members are spaced apart from each other in one direction and arranged in parallel, the mesh receiving portion is provided as a plurality of mesh receiving portions, the guide rib is provided as a plurality of guide ribs, and the plurality of mesh receiving portions and the plurality of guide ribs are arranged alternately in one direction. [11] The arc extinguishing device according to claim 4, wherein the outer arc guide comprises: an outer space adapted to receive the inner arc guide; and a plurality of external surfaces arranged to surround the external space in several directions and provided continuously with each other, and wherein one side of the outer space, directed towards the lattice arm, is open. [12] An arc extinguishing device according to claim 4, wherein the outer arc guide comprises: an outer space adapted to receive the inner arc guide and which is elongated in one direction; a first outer surface configured to surround the outer space at one end based on a direction; a second outer surface provided continuously with the first outer surface and configured to surround the outer space on one side of the grid arm based on an extension direction; and a third outer surface provided continuously with the second outer surface and configured to surround the outer space at the other end based on a direction. [13] The arc extinguishing device according to claim 12, wherein the outer arc guide comprises a fourth outer surface provided continuously with the first outer surface, the second outer surface and the third outer surface and configured to surround the outer space on one side of the grid body based on a width direction. [14] The arc extinguishing device according to claim 13, wherein the inner arc guide is provided as a pair of inner arc guides, the outer arc guide is provided as a pair of outer arc guides, the pair of inner arc guides are respectively received in the outer spaces respectively provided in the pair of outer arc guides, and the pair of inner arc guides are arranged to face each other with the pair of fourth outer surfaces respectively provided in the pair of outer arc guides being interposed therebetween. [15] Arc extinguishing device according to claim 1, comprising: a side frame coupled to the grid part and the arc guide, wherein the side frame is coupled to the grid part at several points. [16] The arc extinguishing device according to claim 15, wherein the grid part comprises a plurality of grid coupling tabs projecting from ends based on a width direction of the grid body and a width direction of the grid arm toward the side frame, and wherein the side frame comprises a plurality of grid coupling portions formed in and penetrating the side frame and configured to receive the plurality of grid coupling tabs. [17] The arc extinguishing device according to claim 15, wherein the arc guide comprises an external mounting hole recessed into an upper surface directed toward the side frame, and wherein the side frame comprises: a side mounting hole formed in the side frame, penetrating the side frame, and corresponding to the outer mounting hole; and a side fastening element adapted to penetrate the side fastening hole and to be inserted into the outer fastening hole.

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