Arc extinguishing device

Abstract

An arc extinguishing device is disclosed. An arc extinguishing device according to one aspect of the present invention may include: a grating portion located at a position close to an external fixed contact and a movable contact to extinguish an arc (arc) generated by separation of the fixed contact and the movable contact; an arc guide coupled to the grid portion and extending in a direction to react with the generated arc to generate a gas; and an arc flow path positioned close to the grid portion and the arc guide, respectively, so as to induce the generated arc toward the grid portion.

Description

Technical Field

[0001] The present invention relates to an arc extinguishing device, and more particularly, to an arc extinguishing device having a structure capable of effectively extinguishing an arc generated when performing a disconnection operation. Background Art

[0002] Circuit breakers are installed in power systems, electrically connected to the power source and load. If an abnormal current flows between the power source and the load, the circuit breaker disconnects the power supply and load, preventing damage to the power source and load due to the abnormal current.

[0003] Typically, a circuit breaker includes a fixed contact and a movable contact. The movable contact is movable toward or away from the fixed contact. When the movable contact is in contact with the fixed contact, power is supplied to the power source and the load. If an abnormal current flows, the movable contact separates from the fixed contact, releasing power to the power source and the load.

[0004] Even at the moment the movable and fixed contacts separate, current, or abnormal current, continues to flow through the movable and fixed contacts. Therefore, when the movable and fixed contacts separate, the energy of the current is converted into a high-temperature, high-voltage electron stream. This converted electron stream is called an arc.

[0005] As mentioned above, an arc is a high-temperature, high-pressure stream of electrons. Therefore, if the arc remains inside the circuit breaker and is not exhausted, the heat or pressure of the arc may damage other components of the circuit breaker. Therefore, the temperature and pressure of the generated arc need to be reduced and the arc needs to be exhausted to the outside. This process is called arc extinguishing.

[0006] To extinguish an arc, it must be stretched sufficiently and quickly. Furthermore, the stretched arc must be split into shorter arcs (often called small arcs) and discharged to the outside. To this end, circuit breakers typically have an arc extinguishing device consisting of multiple grids.

[0007] When an arc occurs, the heat or pressure of the arc may affect the grid. If the grid is damaged by the heat or pressure, the ability to extinguish the arc is reduced, which may reduce the operational reliability of the arc extinguishing device.

[0008] Korean Patent No. 10-1031975 discloses an arc extinguishing device for a DC switch. Specifically, the device utilizes permanent magnets disposed facing each other with a fixed contact and a movable contact interposed therebetween to induce an arc.

[0009] However, the arc extinguishing devices disclosed in the above-mentioned prior art documents require additional permanent magnets to extinguish the arc. As the circuit breaker continues to be used, the magnetic force may weaken, or the permanent magnets may be damaged by the generated arc, thereby reducing the ability to extinguish the arc.

[0010] Korean Patent No. 10-1986552 discloses an arc extinguishing device for a DC air circuit breaker. Specifically, the device utilizes an arc guide and a seal disposed adjacent to each other at the ends of a grid to extinguish an arc.

[0011] However, the arc extinguishing device disclosed in the above-mentioned prior art document only has an arc guide disposed in a portion adjacent to the fixed contact. Therefore, although it can partially induce an arc starting from the fixed contact, it cannot provide a solution for extinguishing the entire arc extending as the movable contact moves.

[0012] Furthermore, the above-mentioned prior art documents fail to provide a solution for preventing the components for inducing an arc from being damaged by the arc.

[0013] Korean Patent No. 10-1031975 (May 9, 2011)

[0014] Korean Patent No. 10-1986552 (June 7, 2019) Summary of the Invention

[0015] Problems to be solved by the invention

[0016] The present invention aims to solve the above-mentioned problem, and an object of the present invention is to provide an arc extinguishing device having a structure capable of preventing a structure for extinguishing an arc from being damaged by the generated arc.

[0017] Another object of the present invention is to provide an arc extinguishing device having a structure capable of preventing insulation breakdown of other components used to protect the above-mentioned components due to the generated arc.

[0018] Another object of the present invention is to provide an arc extinguishing device having a structure capable of effectively guiding a generated arc toward the above-mentioned structure.

[0019] Another object of the present invention is to provide an arc extinguishing device having a structure capable of stably maintaining a coupled state of components for guiding a generated arc.

[0020] Another object of the present invention is to provide an arc extinguishing device having a structure that enables a residual arc to circulate and travel to the outside.

[0021] The problems of the present invention are not limited to the problems mentioned above, and those skilled in the art can clearly understand other problems not mentioned from the following description.

[0022] Technical solutions to the problem

[0023] According to one aspect of the present invention, an arc extinguishing device is provided, which includes: a grid portion located near an external fixed contact and a movable contact to extinguish an arc (arc) generated by separation of the fixed contact and the movable contact; an arc guide coupled to the grid portion and extending in one direction to react with the generated arc to generate gas; and an arc runner located near the grid portion and the arc guide, respectively, to guide the generated arc toward the grid portion; the grid portion includes: a plurality of first grids extending at a prescribed height and spaced apart in the direction; and a plurality of second grids located near the plurality of first grids, extending at a height lower than the prescribed height, and spaced apart in the direction; the arc runner is located in a space surrounded by a plurality of the second grids and a plurality of the first grids, respectively.

[0024] At this time, an arc extinguishing device may be provided, wherein the arc guide includes: a guide body surrounding at least a portion of the first grid and the second grid; and a guide space formed inside the guide body to accommodate at least a portion of the first grid and the second grid.

[0025] In addition, an arc extinguishing device can be provided, wherein the guide body includes: a first guide body formed to surround at least a portion of the first grid and having a specified height; and a second guide body formed to be continuous with the first guide body, surrounding at least a portion of the second grid, and having a height lower than the specified height.

[0026] At this time, an arc extinguishing device can be provided, wherein the guide space includes: a first guide space, accommodating at least a portion of the first grid; and a second guide space, connected to the first guide space and accommodating at least a portion of the second grid; the height of the first guide space is greater than the height of the second guide space.

[0027] In addition, an arc extinguishing device may be provided, wherein the arc guide includes a plurality of grid support members, the plurality of grid support members are located in the guide space and are spaced apart from each other along the one direction to divide the guide space into a plurality of small spaces.

[0028] At this time, an arc extinguishing device can be provided, wherein the arc flow channel includes: a flow channel main body, which is arranged facing the plurality of first grids along the one direction and separated by the plurality of second grids; and a flow channel extension portion, which is continuous with one end portion of the flow channel main body and extends in the direction of the first grid.

[0029] In addition, an arc extinguishing device can be provided, wherein the flow channel extension portion includes: a first flow channel extension portion, which forms a specified angle with the flow channel main body and is continuous with the flow channel main body; a second flow channel extension portion, which forms a specified angle with the first flow channel extension portion and is continuous with the first flow channel extension portion; and a third flow channel extension portion, which forms a specified angle with the second flow channel extension portion and is continuous with the second flow channel extension portion.

[0030] At this time, an arc extinguishing device can be provided, wherein the first flow channel extension portion extends perpendicular to the flow channel main body, the second flow channel extension portion extends at an obtuse angle to the first flow channel extension portion, the third flow channel extension portion extends at an obtuse angle to the second flow channel extension portion, and the third flow channel extension portion is closer to the arc guide than the first flow channel extension portion.

[0031] Furthermore, the arc extinguishing device may be provided in which the corners in the width direction of the end portion in the extending direction of the third flow path extending portion are chamfered (tapered).

[0032] In this case, an arc extinguishing device may be provided, wherein the arc flow channel includes a flow channel arm that is continuous with the other end portion of the flow channel body and extends outward.

[0033] In addition, an arc extinguishing device can be provided, wherein a plurality of flow channel arms are provided, and the plurality of flow channel arms are arranged to be separated from each other along the width direction of the flow channel body, and the arc flow channel includes a circulation space, which is surrounded and defined by the flow channel body and the plurality of flow channel arms, and the circulation space is open to form a space where the plurality of grille portions are located, so that the space where the plurality of grille portions are located is connected to the outside.

[0034] At this time, an arc extinguishing device can be provided, which includes a side frame respectively combined with the arc flow channel and the arc guide, and the arc flow channel includes a flow channel joint portion, which protrudes outward from the end portion of the arc flow channel in the width direction and is combined with the side frame.

[0035] In addition, an arc extinguishing device can be provided, wherein the flow channel joint includes: a first flow channel joint and a second flow channel joint, which protrude outward from the end of the flow channel arm in the width direction; a third flow channel joint, which protrudes outward from the end of the flow channel body in the width direction; and a fourth flow channel joint, which protrudes outward from the end of the flow channel extension in the width direction.

[0036] In this case, an arc extinguishing device may be provided, wherein the side frame includes an arc flow channel joint portion, the arc flow channel joint portion is formed through the side frame in a thickness direction and is combined with the flow channel joint portion.

[0037] In addition, an arc extinguishing device may be provided, wherein the arc flow path extends to any one of the plurality of second grids that is closest to the first grid.

[0038] Effects of the Invention

[0039] According to the above configuration, the arc extinguishing device according to the embodiment of the present invention can prevent the components for extinguishing the arc from being damaged by the generated arc.

[0040] The arc extinguishing device is provided with a plurality of grid sections for extinguishing the generated arc. The plurality of grid sections are coupled to the side frame and spaced apart from each other. The generated arc is discharged to the outside through one end portion in the height direction of the plurality of grid sections.

[0041] An arc guide is coupled to the other end of the grid portion in the height direction. The arc guide is coupled to a grid arm located adjacent to the location where the arc is generated within the grid portion. The arc guide surrounds at least a portion of the grid arm, thereby preventing the arc from directly contacting the grid arm.

[0042] Thus, the grid portion provided for extinguishing the generated arc is not affected by the heat or pressure generated by the arc. Thus, damage to the grid portion, which is a component for extinguishing the arc, can be prevented.

[0043] Furthermore, according to the above-described configuration, the arc extinguishing device according to the embodiment of the present invention can prevent other components for protecting the above-described components from undergoing insulation breakdown due to the generated arc.

[0044] The arc runner may be configured to surround a portion of the grid arm facing the arc. In an embodiment in which a pair of grid arms are provided and arranged facing each other with the fixed contact and the movable contact interposed therebetween, the arc runner may surround the inner side of the grid arm.

[0045] The arc guide includes a guide body surrounding at least a portion of the grid arm and a guide space formed inside the guide body and accommodating at least a portion of the grid arm.

[0046] The guide space is provided with a plurality of grille support members spaced apart from each other along the extending direction of the guide body. The plurality of grille parts accommodated in the guide space are supported by the plurality of grille support members so as not to shake along the arrangement direction thereof.

[0047] In one embodiment, a plurality of grid portions may be respectively inserted into and coupled to a plurality of spaces partitioned by the grid support members, thereby blocking communication between the plurality of spaces and the space where the arc is generated.

[0048] This can minimize the insulation breakdown of the grid portion, the side frames supporting the grid portion, or the arc guide protecting the grid portion caused by the generated arc.

[0049] Furthermore, according to the above configuration, the arc extinguishing device according to the embodiment of the present invention can effectively guide the generated arc toward the above configuration.

[0050] The arc extinguishing device includes an arc flow channel for inducing an arc. The arc flow channel is arranged facing the first grid across the second grid. The arc flow channel may be arranged adjacent to the movable contact farthest from the fixed contact.

[0051] The arc flow channel includes a flow channel body combined with the side frame and a flow channel extension extending from the flow channel body toward the first grid. The flow channel extension extends to a position facing the first grid and the second grid, so that a newly generated arc can be quickly guided by the arc flow channel.

[0052] Thus, the generated arc can be quickly induced by the arc flow path, travel toward the grid portion, and be extinguished.

[0053] Furthermore, according to the above-described configuration, the arc extinguishing device according to the embodiment of the present invention can stably maintain the coupled state of the configuration for guiding the generated arc.

[0054] The arc runner includes a runner arm continuous with the runner body. A plurality of runner coupling portions protrude from the runner body, the runner arm, and the runner extension in the width direction. The plurality of runner coupling portions couple to a plurality of arc runner coupling portions formed on the side frame.

[0055] Any one or more of the plurality of flow channel joints may have a shape different from one or more of the other flow channel joints. Similarly, any one or more of the plurality of arc flow channel joints may have a shape different from one or more of the other arc flow channel joints.

[0056] Thereby, the connection state between the arc flow path and the side frame can be stably maintained.

[0057] Furthermore, according to the above configuration, the arc extinguishing device according to the embodiment of the present invention can circulate the residual arc and allow it to travel to the outside.

[0058] A plurality of flow channel arms may be provided. The plurality of flow channel arms may be spaced apart from one another along the width of the flow channel body. The space partially enclosed by the flow channel arms and the flow channel body is defined as a circulation space. The circulation space connects the space where the arc is generated with the space outside the arc extinguishing device.

[0059] The arc that does not pass through the support frame or the cover frame and returns to the arc generation space can travel in the other direction toward the outside of the arc extinguishing device through the circulation space. After returning to the arc generation space, the traveling arc can be extinguished through the grid portion and flow out of the arc extinguishing device.

[0060] Therefore, the generated arc can circulate inside and outside the arc extinguishing device and advance to the grid portion, thereby minimizing the amount of arc remaining inside the arc extinguishing device.

[0061] The present invention is not limited to the above-mentioned effects, but should be understood to include all effects that can be derived from the configuration of the invention described in the detailed description of the present invention or the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 3D is a perspective view showing an arc extinguishing device according to an embodiment of the present invention.

[0063] Figure 2 It shows Figure 1 Exploded perspective view of the arc extinguishing device.

[0064] Figure 3 It shows Figure 1 A three-dimensional view of a side frame provided in an arc extinguishing device.

[0065] Figure 4 It shows Figure 1 A three-dimensional view of a support frame and a cover frame provided in an arc extinguishing device.

[0066] Figure 5 It shows Figure 4 Exploded perspective view of the support frame and cover frame.

[0067] Figure 6 It shows Figure 4 Top view of the supporting frame.

[0068] Figure 7 It shows Figure 1 A three-dimensional view of the grid portion provided in the arc extinguishing device.

[0069] Figure 8 It shows Figure 7 Side view of the grille portion.

[0070] Figure 9 It shows Figure 1A three-dimensional diagram of the arc flow channel provided in the arc extinguishing device.

[0071] Figure 10 It shows Figure 9 Side view of the arc flow channel.

[0072] Figure 11 It shows Figure 1 A three-dimensional view of an arc guide provided in an arc extinguishing device.

[0073] Figure 12 It shows Figure 11 Side view of the arc guide.

[0074] Figure 13 and Figure 14 is a partially cutaway perspective view showing the flow process of the arc formed in the arc extinguishing device according to an embodiment of the present invention ( Figure 13 ) and side sectional view ( Figure 14 ). DETAILED DESCRIPTION

[0075] Below, embodiments of the present invention are described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. The present invention can be implemented in a variety of different forms and is not limited to the embodiments described herein. To clearly illustrate the present invention, parts not relevant to the description are omitted. Throughout the specification, the same or similar components are given the same reference numerals.

[0076] The terms and concepts used in this specification and claims should not be construed as limited to ordinary or dictionary meanings, but should be interpreted in a manner consistent with the meanings and concepts of the technical ideas of the present invention based on the principle that the inventor can define terms and concepts in order to best explain the present invention.

[0077] Therefore, the embodiments described in this specification and the structures shown in the drawings are equivalent to a preferred embodiment of the present invention, and do not represent the entire technical concept of the present invention. Therefore, the corresponding structures may have multiple equivalents and variations that can be replaced when the present invention is applied.

[0078] In the following description, in order to make the features of the present invention more clear, the description of some structural elements may be omitted.

[0079] 1. Definition of terms

[0080] The term "communication" as used in the following description refers to one or more components being connected so that fluid can flow freely between them. In one embodiment, communication can be achieved through components such as pipes, ducts, and piping. In the following description, communication can also be used synonymously with "fluidically connected" between one or more components.

[0081] The term "energized" as used in the following description refers to one or more components being connected in a manner capable of transmitting current or electrical signals. In one embodiment, energization can be achieved through a wired method such as a wired component, or through a wireless method such as Bluetooth, Wi-Fi, or RFID (radio frequency identification). In one embodiment, energization can also include the meaning of "communication."

[0082] The term "fluid" mentioned in the following description refers to any substance that flows under the action of an external force and can be deformed in shape or volume. In one embodiment, the fluid can be a liquid such as water or a gas such as air.

[0083] The terms "upper side", "lower side", "left side", "right side", "front side" and "rear side" mentioned in the following description can refer to Figure 1 The coordinate system shown can be understood.

[0084] 2. Description of the Structure of the Arc Extinguishing Device 10 of the Embodiment of the Present Invention

[0085] Reference Figure 1 and Figure 2 , shows an arc extinguishing device 10 according to an embodiment of the present invention. Arc extinguishing device 10 in the illustrated embodiment is installed in a circuit breaker (not shown) that is energized by an external power source and load. Arc extinguishing device 10 can extinguish the arc generated by the separation of the fixed and movable contacts to the outside of the circuit breaker (not shown).

[0086] In the illustrated embodiment, the arc extinguishing device 10 includes a side frame 100, a support frame 200, a cover frame 300, a grid portion 400, an arc flow channel 500, and an arc guide 600. Hereinafter, the components of the arc extinguishing device 10 will be described in detail with reference to the accompanying drawings, and the arc guide 600 will be described separately.

[0087] (1) Description of the side frame 100

[0088] The side frame 100 forms part of the outer shape of the arc extinguishing device 10. The side frame 100 is coupled to the other components of the arc extinguishing device 10, namely, the support frame 200, the cover frame 300, the grille 400, the arc flow channel 500, and the arc guide 600. The side frame 100 supports the support frame 200, the cover frame 300, the grille 400, the arc flow channel 500, and the arc guide 600.

[0089] The side frames 100 are combined with the support frame 200. In the illustrated embodiment, upper side ends of the side frames 100 are combined with the support frame 200.

[0090] The side frames 100 are coupled to the cover frame 300. In the illustrated embodiment, upper end portions of the side frames 100 are indirectly coupled to the cover frame 300 using the support frame 200.

[0091] The side frame 100 is combined with the grille portion 400. In the illustrated embodiment, the inner portion of the side frame 100 is combined with each end portion of the grille portion 400 in the width direction.

[0092] The side frame 100 is combined with the arc runner 500. In the illustrated embodiment, the rear side portion of the side frame 100 is combined with the arc runner 500.

[0093] The side frame 100 is combined with the arc guide 600. In the illustrated embodiment, the inner portion of the lower side of the side frame 100 is combined with the arc guide 600. This minimizes the amount of arc that directly contacts the side frame 100, thereby preventing damage to the side frame 100.

[0094] A plurality of side frames 100 may be provided. The plurality of side frames 100 are spaced apart from one another and may be coupled to various components of the arc extinguishing device 10 at different locations. In the illustrated embodiment, the side frames 100 include a first side frame 100a disposed on the left side and a second side frame 100b disposed on the right side, for a total of two side frames 100 provided.

[0095] The first side frame 100a is coupled to the left side of each component of the arc extinguishing device 10. The second side frame 100b is coupled to the right side of each component of the arc extinguishing device 10. A grid portion 400, an arc flow channel 500, and an arc guide 600 are disposed between the first side frame 100a and the second side frame 100b.

[0096] The first side frame 100a and the second side frame 100b are located at different positions, but have the same other structures and functions. Therefore, in the following common description, the first side frame 100a and the second side frame 100b are collectively referred to as "side frames 100".

[0097] exist Figure 3 In the illustrated embodiment, the side frame 100 includes a side body 110 , a support frame coupling portion 120 , a grid coupling portion 130 , an arc flow channel coupling portion 140 , side fastening holes 150 , and a side space 160 .

[0098] The side body 110 constitutes a main body of the side frame 100. The side body 110 is combined with other components of the arc extinguishing device 10.

[0099] The side body 110 may be any shape that can be combined with and support other components of the arc extinguishing device 10. In the illustrated embodiment, the side body 110 is configured as a plate having a height in the vertical direction, a width in the front-rear direction, and a thickness in the left-right direction.

[0100] At this time, a side space 160 is formed on each side of the side body 110 toward the arc runner 500, and in the illustrated embodiment, on the rear lower side, thereby ensuring sufficient space for the arc runner 500 to extend.

[0101] One end portion in the height direction of the side body 110 is coupled to the support frame 200 , which is an upper end portion in the illustrated embodiment.

[0102] The other side of the side body 110 in the height direction is connected to the grid portion 400 and the arc flow channel 500, which is the middle side portion in the embodiment shown. The other end of the side body 110 in the height direction is connected to the arc guide 600, which is the lower end in the embodiment shown.

[0103] The side body 110 is provided with a support frame connection portion 120, a grid connection portion 130, an arc flow channel connection portion 140, and a side fastening hole 150. A side space 160 is formed on one side of the side body 110, ie, on the lower rear side.

[0104] The support frame coupling portion 120 is the portion that couples the side body 110 to the support frame 200. The support frame coupling portion 120 extends through the thickness of the side body 110, extending horizontally in the illustrated embodiment. A support frame coupling protrusion 214, to which the support frame 200 is coupled, is inserted into the support frame coupling portion 120.

[0105] The support frame coupling portion 120 may be any shape that can accommodate the support frame coupling protrusion 214. In the illustrated embodiment, the support frame coupling portion 120 is a space having a rectangular cross-section that is longer in the front-to-back direction than in the up-to-down direction. The shape of the support frame coupling portion 120 may vary depending on the shape of the support frame coupling protrusion 214.

[0106] The support frame coupling portion 120 is formed through the side body 110. Here, the support frame coupling portion 120 may be located on a side of the side body 110 facing the support frame 200, and in the illustrated embodiment, is located near the upper end.

[0107] A plurality of support frame coupling portions 120 may be formed. The plurality of support frame coupling portions 120 may be disposed at different positions to engage with the plurality of support frame coupling protrusions 214 formed at different positions. In the illustrated embodiment, two support frame coupling portions 120 are formed, and are located at positions near the front and rear ends of the upper end portion of the side body 110, respectively.

[0108] The number and arrangement of the support frame coupling portions 120 may vary depending on the number and arrangement of the support frame coupling protrusions 214 .

[0109] A grille coupling portion 130 is formed at a lower side of the support frame coupling portion 120 .

[0110] The grille joint 130 is the portion where the side body 110 and the grille portion 400 are joined. The grille joint 130 is formed through the thickness of the side body 110, which is the left-right direction in the illustrated embodiment. The grille joint 130 has a grille joint protrusion 450, to which the grille portion 400 is joined, inserted.

[0111] The grille coupling portion 130 may be any shape that can accommodate the grille coupling protrusion 450. In the illustrated embodiment, the grille coupling portion 130 is a space having a rectangular cross-section that is longer in the vertical direction than in the front-to-back direction. The shape of the grille coupling portion 130 may vary depending on the shape of the grille coupling protrusion 450.

[0112] The grille coupling portion 130 is formed through the side body 110 . In this case, the grille coupling portion 130 may be located in a middle portion of the side body 110 .

[0113] The grille coupling portions 130 can be divided into a plurality of groups. Different grille coupling protrusions 450 can be inserted and coupled into each of the plurality of grille coupling portions 130. In the illustrated embodiment, the grille coupling portions 130 include a first grille coupling portion 131, a second grille coupling portion 132, and a third grille coupling portion 133, which are divided into three groups in total.

[0114] There may be a plurality of first grille coupling parts 131, second grille coupling parts 132 and third grille coupling parts 133. In the illustrated embodiment, the first to third grille coupling parts 131, 132, 133 each include nineteen through holes spaced apart from each other in the front-to-back direction.

[0115] The first grille coupling protrusion 451 is inserted and coupled to the first grille coupling portion 131. The first grille coupling portion 131 is located at the uppermost side of the plurality of grille coupling portions 130.

[0116] The second grille connection portion 132 is disposed below the first grille connection portion 131 .

[0117] The second grille coupling protrusion 452 is inserted and coupled to the second grille coupling portion 132. The second grille coupling portion 132 is located between the first grille coupling portion 131 and the third grille coupling portion 133 in the up-down direction of the side body 110.

[0118] A third grille connection portion 133 is disposed below the second grille connection portion 132 .

[0119] The third grille coupling protrusion 453 is inserted and coupled to the third grille coupling portion 133. The third grille coupling portion 133 is located below the second grille coupling portion 132 in the vertical direction of the side body 110. In other words, the third grille coupling portion 133 is located at the lowermost side of the grille coupling portion 130.

[0120] The number, arrangement and shape of the first to third grille coupling portions 131 , 132 , 133 may be changed according to the number of grille portions 400 and the arrangement and shape of the grille coupling protrusions 451 , 452 , 453 .

[0121] An arc flow channel joint portion 140 is formed in a direction in which the plurality of grid joint portions 130 are arranged side by side, which is the rear side in the illustrated embodiment.

[0122] The arc runner joint 140 is the portion where the side body 110 and the arc runner 500 are joined. The arc runner joint 140 extends through the thickness of the side body 110, extending horizontally in the illustrated embodiment. A runner joint 550, to which the arc runner 500 is attached, is inserted into the arc runner joint 140.

[0123] The arc runner joint 140 may be any shape that can accommodate the runner joint 550. In the illustrated embodiment, the arc runner joint 140 is a space having a rectangular cross-section with a length in the vertical direction longer than a length in the front-to-back direction. The shape of the arc runner joint 140 may vary depending on the shape of the runner joint 550.

[0124] The arc channel joint 140 is formed through the side body 110. At this time, the arc channel joint 140 can be located near one end of the side body 110 in the longitudinal direction, and in the embodiment shown, is located near the rear end.

[0125] A plurality of arc flow channel coupling parts 140 may be provided. The plurality of arc flow channel coupling parts 140 may be spaced apart from each other and may be coupled to the plurality of flow channel coupling parts 550 , respectively.

[0126] In the illustrated embodiment, the arc channel joint 140 includes a first arc channel joint 141, a second arc channel joint 142, a third arc channel joint 143 and a fourth arc channel joint 144, which are arranged spaced apart from each other along the height direction of the side body 110, that is, in the up and down directions, and a total of four are provided.

[0127] The first arc channel joint 141 is joined to the first channel joint 551 , the second arc channel joint 142 is joined to the second channel joint 552 , the third arc channel joint 143 is joined to the third channel joint 553 , and the fourth arc channel joint 144 is joined to the fourth channel joint 554 .

[0128] The shapes and configurations of the first to fourth arc channel junctions 141, 142, 143, and 144 can be determined to correspond to the shapes and configurations of the first to fourth channel junctions 551, 552, 553, and 554. In the illustrated embodiment, the first to third arc channel junctions 141, 142, and 143 have rectangular cross-sections extending elongated in the vertical direction. Furthermore, the fourth arc channel junction 144 has a rectangular cross-section extending elongatedly and tilted at a predetermined angle in the vertical direction.

[0129] The number and arrangement of the arc flow channel coupling parts 140 may be changed according to the number and arrangement of the flow channel coupling parts 550 .

[0130] A side fastening hole 150 is formed at a lower side of the grille coupling portion 130 .

[0131] The side fastening hole 150 is the portion where the side body 110 and the arc guide 600 are connected. The side fastening hole 150 is formed through the thickness of the side body 110, and in the illustrated embodiment, in the left-right direction. A fastening member (not designated by a reference numeral) that is connected to a fastening hole (not designated by a reference numeral) extending through the arc guide 600 is inserted into the side fastening hole 150.

[0132] In one embodiment, the side fastening hole 150 may be screw-fitted with a fastening member (not marked with a reference numeral). In this embodiment, a thread may be formed on the inner circumference of the side fastening hole 150 .

[0133] A plurality of side fastening holes 150 may be formed. The plurality of side fastening holes 150 are spaced apart from one another along the length of the side body 110, which is the front-to-back direction in the illustrated embodiment. The plurality of side fastening holes 150 may be aligned with and coupled to the plurality of fastening holes (not labeled) formed in the arc guide 600.

[0134] In the illustrated embodiment, the side fastening holes 150 include a first side fastening hole 151 and a second side fastening hole 152 .

[0135] The first side fastening hole 151 is engaged with a fastening member (not labeled) that connects the side body 110 and the arc guide 600. The first side fastening hole 151 is located near one side of the side body 110 in the longitudinal direction, and in the illustrated embodiment, is located near the lower front end.

[0136] The first side fastening hole 151 may be any shape capable of being penetrated and coupled with a fastening member (not marked with a reference numeral). In the illustrated embodiment, the first side fastening hole 151 is a cylindrical shape having a circular cross section and a thickness in the left-right direction.

[0137] The second side fastening hole 152 is engaged with a fastening member (not labeled) that connects the side body 110 and the arc guide 600. The second side fastening hole 152 is located near the middle side in the longitudinal direction of the side body 110, and in the illustrated embodiment, is located near the middle portion of the lower side in the front-to-back direction.

[0138] The second side fastening hole 152 may be any shape capable of being penetrated and coupled with a fastening member (not marked with a reference numeral). In the illustrated embodiment, the second side fastening hole 152 is a cylindrical shape having a circular cross section and a thickness in the left-right direction.

[0139] The number and arrangement of the second-side fastening holes 152 may vary depending on the number and arrangement of fastening holes (not shown) and fastening members (not labeled) of the arc guide 600 .

[0140] The side space 160 is a space formed at one side of the side body 110. A portion of the side space 160 is surrounded by the side body 110, and another portion of the side space 160 may be open.

[0141] The side space 160 is formed by being recessed at one side of the side body 110. The side space 160 may be partially surrounded by the flow channel extension portion 530 of the arc flow channel 500.

[0142] The side space 160 can be formed to correspond to the shape of the flow channel extension 530. In the illustrated embodiment, the side space 160 is formed into a polygonal columnar space having a length in the front-to-back and top-to-bottom directions and a width in the left-to-right direction. This shape can be determined based on the shapes of the flow channel body 510 and the flow channel extension 530 of the arc flow channel 500.

[0143] (2) Description of the support frame 200

[0144] The support frame 200 is connected to the side frame 100 and the cover frame 300. A space is formed inside the support frame 200 to form a path for the generated arc to be extinguished and discharged. A member for filtering foreign matter mixed in the extinguished arc can be provided in the space of the support frame 200.

[0145] The support frame 200 is coupled to the side frame 100. In an embodiment where the side frame 100 includes a first side frame 100a and a second side frame 100b and is provided as a pair, the support frame 200 can be coupled to the first side frame 100a and the second side frame 100b, respectively. In the illustrated embodiment, the left and right sides of the support frame 200 are coupled to the upper side of the side frame 100.

[0146] The support frame 200 is combined with the cover frame 300. The upper portion of the support frame 200 and the space are covered by the cover frame 300. This prevents the components contained in the space from being detached. The space can communicate with the outside through the cover frame 300.

[0147] exist Figures 4 to 6 In the illustrated embodiment, the support frame 200 includes a support body 210 , a support plate 220 , and a mesh plate 230 .

[0148] The support body 210 forms a main body of the support frame 200. The support body 210 is a portion that combines the support frame 200 with other components of the arc extinguishing device 10. Specifically, the support body 210 is combined with the side frame 100 and the cover frame 300.

[0149] A space is formed within the support body 210. The support plate 220 and the mesh plate 230 are disposed within this space. A grille 400 is disposed below this space. The upper side of this space communicates with the exterior of the cover frame 300. This connection between the space housing the grille 400 and the exterior of the cover frame 300 allows arcs to be extinguished and discharged to the outside.

[0150] The support body 210 can be of any shape that can be combined with the side frames 100 and the cover frame 300 and connect the interior of the arc extinguishing device 10 to the outside. In the illustrated embodiment, the support body 210 is in the shape of a square pillar with a quadrilateral cross-section and a vertical height. In this case, a space is formed within the support body 210 along its height, i.e., in the vertical direction.

[0151] In the illustrated embodiment, the support body 210 includes a board receiving portion 211 , a board supporting portion 212 , a buffer space 213 , and a support frame combining protrusion 214 .

[0152] The board receiving portion 211 receives the support plate 220 and the mesh plate 230. The board receiving portion 211 forms a portion of a space formed inside the support body 210. In the illustrated embodiment, the board receiving portion 211 forms an upper space in the inner space of the support body 210.

[0153] The plate receiving portion 211 may be formed in a shape corresponding to the shape of the support plate 220 and the mesh plate 230. In the illustrated embodiment, the plate receiving portion 211 is formed as a space having a rectangular cross-section with a front-to-back length longer than a left-to-right length and a square pillar shape with a height in the up-down direction.

[0154] The plate receiving portion 211 is formed open toward one side of the cover frame 300 , which is the upper side in the illustrated embodiment. The support plate 220 and the mesh plate 230 are received in the plate receiving portion 211 through the one side.

[0155] The plate receiving portion 211 is formed open toward the other side of the grid portion 400 , which is the lower side in the illustrated embodiment. An arc generated in the grid portion 400 can proceed toward the plate receiving portion 211 through the other side.

[0156] A board support portion 212 is arranged below the board storage portion 211 .

[0157] The plate support portion 212 supports the support plate 220 and the mesh plate 230 accommodated in the plate receiving portion 211. Furthermore, the plate support portion 212 extends from the outside to surround the buffer space 213. In other words, the plate support portion 212 makes the cross-sectional area of the buffer space 213 smaller than that of the plate receiving portion 211.

[0158] Therefore, the support plate 220 and the mesh plate 230 accommodated in the plate accommodation portion 211 are supported by the plate support portion 212 so as not to enter the buffer space 213 arbitrarily.

[0159] The board support portion 212 protrudes inward from the inner circumference of the support body 210 . The board support portion 212 extends along the inner circumference of the support body 210 .

[0160] The board support portion 212 can be divided into a plurality of parts. In the illustrated embodiment, the board support portion 212 can be divided into a pair of parts arranged in the front-rear direction and extending in the left-right direction and a pair of other parts arranged in the left-right direction and extending in the front-rear direction.

[0161] A space surrounded by the plate support portion 212 is defined as a buffer space 213 .

[0162] The buffer space 213 forms another part of the space formed inside the support body 210. In the illustrated embodiment, the buffer space 213 forms a lower space in the inner space of the support body 210.

[0163] The buffer space 213 is located between the plate receiving portion 211 and the grille portion 400. The buffer space 213 is formed through the support frame 200 in a height direction, which is a vertical direction in the illustrated embodiment.

[0164] The portion of the buffer space 213 is open to one side of the plate receiving portion 211, which is the upper side in the illustrated embodiment, and is communicated with the plate receiving portion 211. The portion of the buffer space 213 is open to the other side of the grille portion 400, which is the lower side in the illustrated embodiment, and is communicated with the grille portion 400.

[0165] Therefore, the arc that passes through the grid part 400 and is extinguished may be discharged to the outside through the buffer space 213 and the board receiving part 211 in sequence.

[0166] The support frame coupling protrusion 214 is a portion where the support body 210 is coupled to the side body 110. The support frame coupling protrusion 214 is inserted and coupled to the support frame coupling portion 120 of the side frame 100.

[0167] The support frame coupling protrusion 214 is located on the outer peripheral surface of the support body 210. The support frame coupling protrusion 214 protrudes toward the outer side of the support body 210.

[0168] The support frame coupling protrusion 214 may be any shape that can be inserted into the support frame coupling portion 120. In the illustrated embodiment, the support frame coupling protrusion 214 is formed to extend in the front-to-rear direction, has a width in the left-to-right direction, and has a height in the upper-lower direction.

[0169] At this time, the support frame coupling protrusion 214 can have different cross-sectional areas along its height direction. In the illustrated embodiment, the support frame coupling protrusion 214 is formed so that the cross-sectional area on the upper side is larger than the cross-sectional area on the lower side. In other words, the outer side of the support frame coupling protrusion 214 extends obliquely toward the inner side of the lower side.

[0170] Therefore, the support frame coupling protrusion 214 can be easily inserted and coupled to the support frame coupling portion 120. In addition, the support frame coupling protrusion 214 inserted into the support frame coupling portion 120 will not be arbitrarily separated from the support frame coupling portion 120 without external force.

[0171] The supporting frame coupling protrusions 214 may be formed in a plurality and may be spaced apart and disposed at different positions to be coupled with the plurality of supporting frame coupling portions 120 respectively.

[0172] In the illustrated embodiment, a pair of support frame engaging protrusions 214 are provided on each of the left and right outer surfaces of the support body 210, for a total of four. The pairs of support frame engaging protrusions 214 formed on the left and right outer surfaces of the support body 210 are spaced apart from each other in the front-to-back direction.

[0173] The number and arrangement of the support frame coupling protrusions 214 may vary depending on the number and arrangement of the support frame coupling portions 120 .

[0174] The support plate 220 partially connects the space where the grid portion 400 is located and the outside of the arc extinguishing device 10. The support plate 220 supports the mesh plate 230 from the lower side.

[0175] The support plate 220 is accommodated in the plate accommodation portion 211 . At this time, the outer periphery of the support plate 220 is supported by the plate support portion 212 , so that the support plate 220 does not move to the buffer space 213 .

[0176] The support plate 220 may be formed in a shape corresponding to the cross-sectional shape of the plate receiving portion 211. In the illustrated embodiment, the support plate 220 is formed in a square plate shape and has a cross-section with a protrusion formed at one end portion in the extending direction thereof and a recessed portion formed at the other end portion in the extending direction thereof, and the support plate 220 has a thickness in the up-down direction.

[0177] The support plate 220 supports the mesh plate 230 from the lower side. With the support plate 220, the mesh plate 230 does not enter the buffer space 213.

[0178] exist Figure 6 In the illustrated embodiment, the support plate 220 includes a support communication hole 221 and a plate body 222 .

[0179] The support holes 221 are formed through the support plate 220, partially connecting the space where the grid portion 400 is located with the outside of the arc extinguishing device 10. The arc generated and extinguished in the grid portion 400 can be discharged to the outside through the support holes 221 and the mesh plate 230.

[0180] A plurality of supporting and connecting holes 221 may be formed. The plurality of supporting and connecting holes 221 are spaced apart from one another and may connect the space within the grid portion 400 and the outside at different locations. In the illustrated embodiment, the plurality of supporting and connecting holes 221 are offset toward the front, opposite the arc flow path 500 located at the rear. This is to increase the internal pressure of the generated initial arc, causing the generated arc to rapidly extend and flow into the arc extinguishing device 10.

[0181] Specifically, the fixed contact and the movable contact are located opposite the arc flow path 500. In this case, the portion of the support plate 220 located above the fixed contact and the movable contact does not have the support hole 221 formed therein. As a result, the support hole 221 is partially sealed from the fixed contact and the movable contact, allowing the pressure of the generated initial arc to increase rapidly.

[0182] The plate body 222 may be defined as the remaining portion of the support plate 220 where the plate communication holes 221 are not formed. That is, the plate body 222 is configured to block the communication between the space where the grid portion 400 is located and the outside of the arc extinguishing device 10 .

[0183] As described later, a portion of the generated arc may flow out of the arc extinguishing device 10 through the support communication hole 221. Conversely, another portion of the generated arc may travel in a direction opposite to the support plate 220 after colliding with the plate body 222.

[0184] At this time, a circulation space 540 is formed in the arc flow channel 500 to form a channel for the returned arc (Arc) to move back to the grid portion 400. Thus, the arc (Arc) that collides with the plate body 222 can be extinguished again and discharged to the outside.

[0185] The mesh plate 230 is configured to filter foreign matter and the like remaining in the extinguished and discharged arc. The mesh plate 230 prevents foreign matter remaining in the arc from being arbitrarily discharged outside the arc extinguishing device 10. This prevents damage to the arc extinguishing device 10 or other components of the circuit breaker (not shown) caused by such foreign matter and the like.

[0186] The mesh plate 230 is accommodated in the plate accommodation portion 211. At this time, the mesh plate 230 is arranged to cover the support plate 220 and is supported by the support plate 220.

[0187] The mesh plate 230 can be configured in any shape that can be accommodated in the plate accommodation portion 211 and can filter foreign matter remaining in the arc. In the illustrated embodiment, the mesh plate 230 is formed in a quadrilateral plate shape corresponding to the support plate 220 .

[0188] A plurality of mesh plates 230 may be provided. The mesh plates 230 are stacked along their thickness and can each filter foreign matter and other particles remaining in the arc passing therethrough. In the illustrated embodiment, six mesh plates 230 are provided and stacked vertically. Thus, the arc passing through the mesh plates 230 can be filtered multiple times before being discharged outside the arc extinguishing device 10.

[0189] In the illustrated embodiment, the mesh panel 230 located at the lowermost side is supported by the support plate 220 , and the mesh panel 230 located at the uppermost side is covered by the cover frame 300 .

[0190] In one embodiment, the mesh plate 230 may include mesh through holes (not shown) and mesh ribs (not shown).

[0191] In the described embodiment, mesh holes (not shown) are formed throughout the thickness of the mesh plate 230, forming a passage for the arc to pass through. The mesh holes (not shown) are defined by mesh ribs (not shown). The mesh holes (not shown) can be of any shape that allows the arc to pass through while blocking the passage of foreign matter remaining in the arc.

[0192] The mesh holes (not shown) are surrounded by mesh ribs (not shown). A plurality of mesh ribs (not shown) are provided, extending along the length and width of the mesh plate 230. Ribs (not shown) extending in the same direction are spaced apart from each other to form mesh holes (not shown) therebetween.

[0193] A plurality of mesh through holes (not shown) and mesh ribs (not shown) may be formed, and the plurality of mesh through holes (not shown) and mesh ribs (not shown) may be alternately arranged along the length and width of the mesh plate 230 .

[0194] In addition, the plurality of mesh through holes (not shown) and the plurality of mesh ribs (not shown) respectively formed in the stacked plurality of mesh plates 230 may be alternately arranged along the stacking direction thereof, that is, in the vertical direction in the illustrated embodiment.

[0195] Therefore, the arc passing through the mesh holes (not shown) formed in any one mesh plate 230 can pass through the mesh holes (not shown) formed in the other mesh plate 230 after traveling in the horizontal direction. This can improve the filtering effect of foreign matter remaining in the arc.

[0196] (3) Description of the Cover Frame 300

[0197] The cover frame 300 covers the support frame 200 and is coupled to the support frame 200. The cover frame 300 supports the support plate 220 and the mesh plate 230 provided on the support frame 200 from above. Even if pressure is generated during a disconnection operation, the cover frame 300 prevents the support plate 220 and the mesh plate 230 from being detached.

[0198] The cover frame 300 is coupled to the support frame 200. A plurality of through-holes (i.e., cover through-holes 320, described below) are formed within the cover frame 300, connecting the interior of the support body 210 (i.e., the plate receiving portion 211 and the buffer space 213) with the outside. This allows the arc, which has passed through the grille portion 400 and been extinguished, to pass through the support frame 200 and the cover frame 300 and be discharged to the outside.

[0199] exist Figure 4 and Figure 5 In the illustrated embodiment, the cover frame 300 includes a cover body 310 , a cover through-hole 320 , and a cover rib 330 .

[0200] The cover body 310 forms the main body of the cover frame 300. The cover body 310 is formed in a shape corresponding to the support body 210 so as to cover the space formed inside the support body 210 and be coupled to the support body 210. In the illustrated embodiment, the cover body 310 is formed to have a polygonal cross-section with a length in the front-to-back direction longer than a length in the left-to-right direction and has a thickness in the top-to-bottom direction.

[0201] A cover through-hole 320 and a cover rib 330 are provided inside the cover body 310 .

[0202] The cover through hole 320 is formed through the interior of the cover body 310, connecting the interior space of the support body 210 with the outside. The arc passing through the support plate 220 and the mesh plate 230 accommodated in the support body 210 can be discharged to the outside of the arc extinguishing device 10 through the cover through hole 320.

[0203] The cover through-hole 320 is formed through the thickness of the cover body 310, extending vertically in the illustrated embodiment. One end of the cover through-hole 320 is open and communicates with the outside, which is the upper side in the illustrated embodiment. The other end of the cover through-hole 320 is open and communicates with the interior space of the support body 210, which is the lower side in the illustrated embodiment.

[0204] The cover through hole 320 is surrounded by a cover rib 330. The cover rib 330 extends in the length and width directions of the cover body 310, which are the front-to-back direction and the left-to-right direction in the illustrated embodiment, and surrounds the cover rib 330 in the horizontal direction.

[0205] The cover through hole 320 may be any shape that can connect the interior space of the support body 210 and the exterior of the arc extinguishing device 10. In the illustrated embodiment, the cover through hole 320 is formed as a quadrilateral plate-shaped space having a quadrilateral cross section and a thickness in the vertical direction.

[0206] The cover through-holes 320 and the cover ribs 330 may be provided in plural numbers, and the plural cover through-holes 320 and the plural cover ribs 330 may be alternately arranged along the length direction and the width direction of the cover body 310 .

[0207] In the illustrated embodiment, four cover through-holes 320 are formed in the front-to-back direction and three in the left-to-right direction, for a total of twelve. The cover ribs 330 may extend between the cover through-holes 320 that are disposed adjacent to each other.

[0208] (4) Description of the Grille 400

[0209] The grid section 400 extinguishes the arc formed when the fixed and movable contacts separate when current is flowing. The arc cools, stretches, moves, and splits along the grid section 400, and is discharged outside the arc extinguishing device 10. Therefore, it can be said that the grid section 400 essentially performs the function of extinguishing the arc.

[0210] The grille portion 400 is coupled to the side frame 100. Each end portion of the grille portion 400 in the width direction is supported by a pair of side frames 100a and 100b.

[0211] A portion of the grille portion 400 is received in the support frame 200. In the illustrated embodiment, a portion of the upper side of the grille portion 400 is received in the buffer space 213 of the support frame 200.

[0212] The grid portion 400 is disposed adjacent to the arc flow channel 500 . A generated arc (Arc) may flow toward the grid portion 400 through the arc flow channel 500 .

[0213] The grid portion 400 is combined with the arc runner 600. With the arc runner 600, the generated arc can obtain sufficient energy so that the space formed between the plurality of grid portions 400 can be elongated, divided, and extinguished.

[0214] A plurality of grid sections 400 may be provided. The grid sections 400 may be spaced apart and arranged side by side along the direction of movement of the movable contact, which in the illustrated embodiment is the front-to-back direction. The generated arc may pass through the spaces formed between the grid sections 400, thereby being divided, cooled, and extinguished.

[0215] The plurality of grille parts 400 may be divided into a plurality of groups according to their shapes. The plurality of groups of grille parts 400 may be spaced apart from each other along the aforementioned direction, ie, the front-rear direction.

[0216] exist Figure 7 and Figure 8 In the illustrated embodiment, the grille portion 400 includes a first grille 400a and a second grille 400b, which can be divided into two groups of grilles.

[0217] The first grid 400a is located at one end of the direction in which the plurality of grid portions 400 are arranged side by side, and in the illustrated embodiment, is the front end. The first grid 400a is arranged closest to the fixed contact.

[0218] The second grilles 400b are located behind the first grilles 400b. The second grilles 400b are alternately arranged along the direction in which the plurality of grille portions 400 are arranged side by side, and in the illustrated embodiment, are alternately arranged from the front side to the rear side.

[0219] That is, the first grille 400a constitutes a portion of the front side of the plurality of grille sections 400, and the second grille 400b constitutes the remaining portion of the rear side of the plurality of grille sections 400. In the illustrated embodiment, the first grille 400a is composed of eight (or nine) grilles located on the front side, and the second grille 400b is composed of ten grilles located on the rear side of the first grille 400a.

[0220] The first grille 400a and the second grille 400b are essentially distinguished from each other in terms of their heights. That is, in the illustrated embodiment, there is a difference in length in the vertical direction.

[0221] That is, Figure 8 As shown, the first height H1 of the first grille 400a is greater than the second height H2 of the second grille 400b. In other words, the first grille 400a extends longer in the vertical direction than the second grille 400b.

[0222] Therefore, if the upper ends of the first grille 400a and the second grille 400b are located at the same height, the lower end of the second grille 400b is located upward compared to the lower end of the first grille 400a.

[0223] Thus, a space partially surrounded by the side frame 100 and the first grid 400a is formed below the second grid 400b. The arc flow path extension 530 of the arc flow path 500 can be accommodated in the space. Therefore, an arc traveling into the space can extend along the flow path extension 530 toward the grid portion 400.

[0224] The first grille 400a and the second grille 400b differ only in the height (ie, length in the vertical direction) of the grille arms 420, while the other structures and functions are the same. Therefore, in the following description, the same descriptions are collectively referred to as the grille portion 400.

[0225] exist Figure 7 and Figure 8 In the illustrated embodiment, the grid portion 400 includes a grid body 410 , grid arms 420 , an arc induction space 430 , an arc extension space 440 , a grid coupling protrusion 450 , and a frame coupling protrusion 460 .

[0226] The grid body 410 forms a main body of the grid portion 400. The grid body 410 substantially performs the functions of dividing, cooling, and thus extinguishing the arc.

[0227] The grille body 410 may be in the shape of a plate. In the illustrated embodiment, the grille body 410 is in the shape of a quadrilateral plate, the left-right length of which is longer than the up-down length.

[0228] The grille body 410 is continuous with the grille arms 420. In the illustrated embodiment, the lower side of the grille body 410 is continuous with the upper side of the grille arms 420.

[0229] The grid body 410 partially surrounds the arc induction space 430 and the arc extension space 440. In the illustrated embodiment, the grid body 410 surrounds upper sides of the arc induction space 430 and the arc extension space 440.

[0230] The first and second grille coupling protrusions 451 and 452 of the grille coupling protrusions 450 are provided at respective widthwise ends of the grille body 410. A frame coupling protrusion 460 is provided at one heightwise end of the grille body 410, which is the upper end in the illustrated embodiment.

[0231] The grid arm 420 is continuous with the grid body 410 . The grid arm 420 extends from a lower end portion of the grid body 410 and surrounds a portion of the arc induction space 430 or the arc extension space 440 .

[0232] The grid arm 420 is combined with the arc guide 600. The arc guide 600 combined with the grid arm 420 may be combined with the side frame 100 and supported.

[0233] A plurality of grille arms 420 may be formed. The plurality of grille arms 420 may be spaced apart from each other and may be coupled to the grille body 410 at different locations. In the illustrated embodiment, a pair of grille arms 420 are provided, including a first grille arm 421 located on the left and a second grille arm 422 located on the right.

[0234] The first and second grid arms 421 and 422 are spaced apart from each other in the width direction, ie, the left-right direction, of the grid body 410. In other words, the first and second grid arms 421 and 422 face each other across the arc induction space 430 or the arc extension space 440.

[0235] As described above, the pair of grille arms 420 provided at the first grille 400 a may extend longer than the pair of grille arms 420 provided at the second grille 400 b .

[0236] The third grille coupling protrusion 453 of the grille coupling protrusion 450 is formed at an outer corner of the grille arm 420 .

[0237] The arc induction space 430 guides an arc generated when the fixed contact and the movable contact are separated toward the grid bodies 410 or a space between the grid bodies 410 .

[0238] A portion of arc induction space 430 is surrounded by grid body 410 and grid arms 420. In the illustrated embodiment, a portion of the upper side of arc induction space 430 is surrounded by grid body 410, and a portion of the left and right sides of arc induction space 430 are surrounded by a pair of grid arms 420.

[0239] The arc inducing spaces 430 can be arranged so that their offset positions alternate along the arrangement direction of the plurality of grille sections 400. Specifically, in the illustrated embodiment, the arc inducing spaces 430 of the frontmost grille section 400 are offset to the right. In this case, the arc inducing spaces 430 of the other grille section 400 closest to the frontmost grille section 400 can be offset to the left.

[0240] Therefore, the generated arc may be alternately induced along the width direction of the grid portion 400 and induced to the grid bodies 410 or the spaces between the grid bodies 410. Thus, the process of extinguishing the generated arc may be effectively performed.

[0241] The arc extension space 440 is a space where the movable contact seat (not shown) moves. The arc generated between the movable contact and the fixed contact can be extended along the moving movable contact seat (not shown) and guided to the grid body 410 or the space between the grid bodies 410.

[0242] A portion of the arc extension space 440 is surrounded by the grid body 410 and the grid arms 420. In the illustrated embodiment, the arc extension space 440 is surrounded by the grid body 410 on its upper side and by the grid arms 420 on its left and right sides in its width direction.

[0243] The arc extension space 440 communicates with the arc induction space 430. The arc extending in the arc extension space 440 can be induced to the grid bodies 410 or the space between the grid bodies 410 by the arc induction space 430.

[0244] The grille coupling protrusion 450 is a portion where the grille portion 400 is coupled to the side frame 100. The grille coupling protrusion 450 is inserted and coupled to the grille coupling portion 130 formed in the side frame 100.

[0245] The grille coupling protrusions 450 are continuous with the grille body 410 and the grille arms 420. The grille coupling protrusions 450 protrude outward from respective widthwise ends of the grille body 410 and the grille arms 420, and in the illustrated embodiment, protrude outward from left and right corners.

[0246] A plurality of grille coupling protrusions 450 may be provided. The plurality of grille coupling protrusions 450 may be coupled to the plurality of grille coupling portions 130, respectively. In the illustrated embodiment, three grille coupling protrusions 450 are provided, including a first grille coupling protrusion 451, a second grille coupling protrusion 452, and a third grille coupling protrusion 453.

[0247] The first grille coupling protrusion 451 is inserted and coupled to the first grille coupling portion 131. The first grille coupling protrusion 451 is located at the uppermost side of the plurality of grille coupling protrusions 450. The first grille coupling protrusion 451 protrudes outward from both side corners of the grille body 410.

[0248] The second grille coupling protrusion 452 is inserted and coupled to the second grille coupling portion 132. The second grille coupling protrusion 452 is located in the middle of the plurality of grille coupling protrusions 450. The second grille coupling protrusion 452 protrudes outward from both side corners of the upper side of the grille arm 420.

[0249] The third grille coupling protrusion 453 is inserted and coupled to the third grille coupling portion 133. The third grille coupling protrusion 453 is located at the bottom of the plurality of grille coupling protrusions 450. The third grille coupling protrusion 453 protrudes outward from both side corners of the bottom side of the grille arm 420.

[0250] The number, shape, and arrangement of the grille coupling protrusions 450 may vary according to the number, shape, and arrangement of the grille coupling portions 130 .

[0251] (5) Description of the Arc Flow Channel 500

[0252] The arc flow channel 500 guides the arc generated by the separation of the fixed and movable contacts toward the arc induction space 430. The arc flow channel 500 is located downstream of the generated arc, i.e., at a position farthest from the fixed contacts. In the illustrated embodiment, the arc flow channel 500 is located at the rear of the arc extinguishing device 10, adjacent to the rearmost grid section 400 among the plurality of grid sections 400.

[0253] In other words, the arc flow path 500 is away from the first grid 400a on the front side and close to the second grid 400b on the rear side. In the illustrated embodiment, the arc flow path 500 extends on the rear side and lower side of the second grid 400b.

[0254] The arc runner 500 is coupled to the side frame 100. Both sides of the arc runner 500 in the width direction are supported by a pair of side frames 100a and 100b.

[0255] exist Figure 9 and Figure 10 In the illustrated embodiment, the arc runner 500 includes a runner body 510 , a runner arm 520 , a runner extension 530 , a circulation space 540 , a runner junction 550 , and a runner space 560 .

[0256] The flow channel body 510 forms the main body of the arc flow channel 500. The flow channel body 510 is continuous with the other components of the arc flow channel 500. The flow channel body 510 partially overlaps with the rearmost grid portion 400 among the plurality of grid portions 400 in the front-to-back direction.

[0257] The flow channel body 510 may be any shape that is continuous with other components of the arc flow channel 500 and capable of inducing an arc. In the illustrated embodiment, the flow channel body 510 is configured as a quadrilateral plate having a length in the left-right direction longer than in the up-down direction.

[0258] The flow channel body 510 may be positioned further forward than the rear end portion of each corner of the side body 110 , so that the flow channel body 510 is not exposed to the rear side of the side body 110 .

[0259] One end of the flow channel body 510 in the height direction is continuous with the flow channel arm 520 , which is the upper end in the illustrated embodiment. The upper end of the flow channel body 510 and the flow channel arm 520 together surround a portion of the circulation space 540 .

[0260] The other end of the flow channel body 510 in the height direction is continuous with the flow channel extension 530. In addition, a flow channel joint 550 is formed at each end of the flow channel body 510 in the length direction, that is, the left end and the right end.

[0261] The runner arm 520 forms part of the other components of the arc runner 500. The runner arm 520 is continuous with the runner body 510. The runner arm 520 extends along the height of the runner body 510, which in the illustrated embodiment is the vertical direction.

[0262] One end of the runner arm 520 in the extending direction can be accommodated in the buffer space 213 of the support frame 200, which is the upper end in the illustrated embodiment. The other end of the runner arm 520 in the extending direction is continuous with the runner body 510, which is the lower end in the illustrated embodiment.

[0263] The runner arm 520 is coupled to the side frame 100. Specifically, a first runner coupling portion 551 and a second runner coupling portion 552 of the runner coupling portion 550 are formed protruding from the outer corners of the runner arm 520. The first runner coupling portion 551 and the second runner coupling portion 552 can be inserted and coupled to the first arc runner coupling portion 141 and the second arc runner coupling portion 142.

[0264] The flow channel arm 520, together with the flow channel body 510, surrounds a portion of the circulation space 540. In the illustrated embodiment, the flow channel arm 520 surrounds the circulation space 540 in the width direction, ie, left and right sides.

[0265] A plurality of flow channel arms 520 may be provided. Each of the plurality of flow channel arms 520 is continuous with the flow channel body 510 and may be spaced apart from one another. In the illustrated embodiment, two flow channel arms 520 are provided, including a first flow channel arm 521 positioned to the left and a second flow channel arm 522 positioned to the right. The first flow channel arm 521 and the second flow channel arm 522 are positioned facing each other across the circulation space 540.

[0266] The flow channel extension 530 may be defined as another portion of the arc flow channel 500. The flow channel extension 530 substantially performs the function of inducing the generated arc. The flow channel extension 530 extends to the lower side of the grid portion 400 so as to be disposed adjacent to the fixed contact.

[0267] The flow channel extension portion 530 is continuous with the flow channel body 510. The flow channel extension portion 530 extends between the flow channel body 510 and the lower side of the grille portion 400.

[0268] One end of the flow channel extension 530 in the extension direction may be located below the second grille 400b, which extends to the second height H2. In the illustrated embodiment, this is the front end. As described above, because the second height H2 is less than the first height H1 of the first grille 400a, the flow channel extension 530 may extend below the second grille 400b.

[0269] The other end portion of the flow channel extension portion 530 in the extending direction may be continuous with the lower end portion of the flow channel body 510 , and in the illustrated embodiment, is the rear end portion.

[0270] The flow channel extension 530 is disposed opposite the flow channel arm 520. In other words, the flow channel extension 530 is disposed facing the flow channel arm 520 across the flow channel body 510. In the illustrated embodiment, the flow channel extension 530 is continuous with the lower end of the flow channel body 510 and is thus disposed facing the flow channel arm 520, which is continuous with the upper end of the flow channel body 510.

[0271] The flow channel extension 530 can be formed to correspond to the shape of the flow channel body 510. In the illustrated embodiment, the flow channel extension 530 is formed in a plate shape having a width in the left-right direction. A fourth flow channel junction 554 is disposed at each end of the flow channel extension 530 in the width direction, in the illustrated embodiment, at the left and right corners.

[0272] The flow channel extension 530 can be divided into a plurality of sections. The plurality of sections can form a predetermined angle with each other and be continuous. In the illustrated embodiment, the flow channel extension 530 includes a first flow channel extension 531 , a second flow channel extension 532 , and a third flow channel extension 533 .

[0273] The first flow channel extension 531 is a portion of the flow channel extension 530 that is continuous with the flow channel body 510. The first flow channel extension 531 forms a predetermined angle with the flow channel body 510 and is continuous therewith. In one embodiment, the predetermined angle may be a right angle. In this embodiment, the first flow channel extension 531 may extend horizontally.

[0274] The first flow channel extension portion 531 may be located at the same height as the corner of the side body 110 that surrounds the side space 160 from the upper side, or higher (see Figure 14 Thus, the first flow channel extension portion 531 does not protrude outside the side body 110 .

[0275] One end portion of the first flow channel extension portion 531 in the extending direction is continuous with the second flow channel extension portion 532 , and in the illustrated embodiment, is the front end portion.

[0276] The second flow channel extension 532 is continuous with the first flow channel extension 531 and the third flow channel extension 533. The second flow channel extension 532 forms a predetermined angle with the first flow channel extension 531 and is continuous with the first flow channel extension 531. In one embodiment, the predetermined angle may be an obtuse angle. In this embodiment, the second flow channel extension 532 may extend obliquely toward the lower front side and the upper rear side.

[0277] A fourth flow channel junction 554 is disposed at each end portion in the width direction of the second flow channel extension portion 532 , which is the left end portion and the right end portion in the illustrated embodiment.

[0278] One end of the second flow channel extension 532 in the extending direction is continuous with the third flow channel extension 533, which is the front end in the illustrated embodiment. As shown in the figure, the other end of the second flow channel extension 532 in the extending direction is continuous with the first flow channel extension 531, which is the rear end in the illustrated embodiment.

[0279] The third flow channel extension 533 is continuous with the second flow channel extension 532. The third flow channel extension 533 forms a predetermined angle with the second flow channel extension 532 and is continuous. In one embodiment, the predetermined angle may be an obtuse angle. In this embodiment, the third flow channel extension 533 may extend horizontally.

[0280] Each vertex at one end of the third flow channel extension 533 in its extension direction may be chamfered (in the illustrated embodiment, this is the front end). This can enhance the arc inducing effect of the third flow channel extension 533. The other end of the third flow channel extension 533 in its extension direction is continuous with the second flow channel extension 532, in the illustrated embodiment, this is the rear end.

[0281] The position of the one end of the third flow channel extension 533 can be determined according to the movement position of the movable contact seat. That is, the third flow channel extension 533 can be located near the movable contact seat that has moved to its maximum position in the direction opposite to the fixed contact seat.

[0282] The circulation space 540 forms a passage for the remaining arc (Arc) that fails to flow out after entering the arc extinguishing device 10 to circulate and advance toward the grid portion 400. The circulation space 540 is formed inside the arc flow channel 500 and connects the arc extinguishing device 10 to the outside.

[0283] At this time, the circulation space 540 connects the interior of the arc extinguishing device 10 with the exterior in a direction different from that of the support frame 200 or the cover frame 300. In the illustrated embodiment, the support frame 200 or the cover frame 300 connects the upper side of the arc extinguishing device 10 with the exterior. The circulation space 540 connects the rear side of the arc extinguishing device 10 with the exterior.

[0284] The circulation space 540 can be defined as a space surrounded by the flow channel body 510 and the flow channel arms 520. In the illustrated embodiment, the lower side of the circulation space 540 is surrounded by the flow channel body 510, and the left and right sides of the circulation space 540 are surrounded by a pair of flow channel arms 520. The front side, the rear side, and the upper side of the circulation space 540 are open and communicate with the outside.

[0285] The process in which the arc circulates through the circulation space 540 and re-enters the arc extinguishing device 10 will be described in detail later.

[0286] The flow channel joint 550 is a portion where the arc flow channel 500 is joined to the side frame 100. The flow channel joint 550 is inserted into the arc flow channel joint 140 joined to the side frame 100. By this joining method, the arc flow channel 500 can be joined to the side frame 100 and supported by the side frame 100.

[0287] The flow channel joint 550 is continuous with the flow channel body 510, the flow channel arm 520 and the flow channel extension 530. The flow channel joint 550 protrudes outward from each end of the flow channel body 510, the flow channel arm 520 and the flow channel extension 530 in the width direction, which is the left end and the right end in the embodiment shown.

[0288] A plurality of flow channel joints 550 may be provided. The plurality of flow channel joints 550 may be continuous with the flow channel body 510, the flow channel arm 520, or the flow channel extension 530 at different positions. In addition, the plurality of flow channel joints 550 may be respectively combined with the plurality of arc flow channel joints 140.

[0289] In the illustrated embodiment, the flow channel junction 550 includes a first flow channel junction 551 , a second flow channel junction 552 , a third flow channel junction 553 , and a fourth flow channel junction 554 .

[0290] The first flow channel joint portion 551 is located at the uppermost side of the plurality of flow channel joint portions 550. A pair of first flow channel joint portions 551 are provided, and are respectively located at the outer corners of the flow channel arm 520, namely, the left corner of the first flow channel arm 521 and the right corner of the second flow channel arm 522 in the illustrated embodiment.

[0291] The first flow channel joint portion 551 is disposed adjacent to one end portion of the flow channel arm 520 in the extending direction, which is the upper end portion in the illustrated embodiment. The first flow channel joint portion 551 is joined to the first arc flow channel joint portion 141 .

[0292] The second flow channel junction 552 is located between the first flow channel junction 551 and the third flow channel junction 553. A pair of second flow channel junctions 552 are provided, each located at the outer corner of the flow channel arm 520. The second flow channel junction 552 is positioned adjacent to the middle portion of the flow channel arm 520 in the extending direction. The second flow channel junction 552 is coupled to the second arc flow channel junction 142.

[0293] The third flow channel junction 553 is located below the second flow channel junction 552 and above the fourth flow channel junction 554. A pair of third flow channel junctions 553 are provided, located at the outer corners of the flow channel body 510, respectively, in the illustrated embodiment, at the left and right corners. The third flow channel junctions 553 are coupled to the third arc flow channel junction 143.

[0294] The fourth flow channel junction 554 is located below the third flow channel junction 553. A pair of fourth flow channel junctions 554 are provided, located at the outer corners of the second flow channel extension 532 in the width direction, respectively, on the left and right corners in the illustrated embodiment. The fourth flow channel junctions 554 are coupled to the fourth arc flow channel junction 144.

[0295] Since the runner body 510, the runner arm 520, and the runner extension 530 are supported by the fourth runner coupling portion 554, the arc runner 500 and the side frame 100 can be stably coupled. This prevents the runner extension 530 from shaking, and effectively induces the generated arc.

[0296] In the illustrated embodiment, the first to third flow channel junctions 551, 552, and 553 extend in the vertical direction. Furthermore, the fourth flow channel junction 554 extends obliquely toward the lower front side and the upper rear side. In this case, the first flow channel junction 551 and the second flow channel junction 552 extend for a shorter length than the third flow channel junction 553.

[0297] The shapes and configurations of the first to fourth flow channel combining portions 551 , 552 , 553 , and 554 may be changed according to the shapes and configurations of the first to fourth arc flow channel combining portions 141 , 142 , 143 , and 144 .

[0298] The flow channel space 560 is a space partially surrounded and defined by the flow channel extension portion 530. The flow channel space 560 and the side space 160 are arranged to overlap in the width direction, which is the left-right direction in the illustrated embodiment.

[0299] The flow channel space 560 is surrounded by the flow channel extension 530. In the illustrated embodiment, the upper side of the flow channel space 560 is surrounded by the first flow channel extension 531, and the front side of the flow channel space 560 is surrounded by the second flow channel extension 532. The other side of the flow channel space 560 is open, which is the lower side and the rear side in the illustrated embodiment.

[0300] 3. Description of the Arc Guide 600 of the Embodiment of the Present Invention

[0301] Refer again Figure 1 and Figure 2 The arc extinguishing device 10 according to the embodiment of the present invention includes an arc guide 600 .

[0302] The arc guide 600 of the embodiment of the present invention can prevent damage to other components caused by heat or pressure generated by the arc. In addition, the arc guide 600 allows the induced arc to be extended, cooled, split, and extinguished along the plurality of grid portions 400.

[0303] The arc guide 600 is coupled to the side frame 100 . Specifically, fastening members (not labeled) penetrate the second side fastening holes 152 and fastening holes (not labeled) of the arc guide 600 , respectively, so that the arc guide 600 is coupled to the side frame 100 .

[0304] Arc guide 600 is coupled to grid portion 400. Specifically, a portion of grid arm 420 is accommodated in guide space 620 of arc guide 600. This prevents damage to grid arm 420 caused by arcs and allows the induced arc to flow along grid body 410 and be effectively extinguished.

[0305] A plurality of arc guides 600 may be provided. The plurality of arc guides 600 may be respectively combined with the plurality of side frames 100 and the plurality of grid arms 420. Figure 11 In the illustrated embodiment, two arc runners 600 are provided, including a first arc runner 600 a located on the left and a second arc runner 600 b located on the right.

[0306] The first arc guide 600a is combined with the first side frame 100a and the first grid arm 421. The second arc guide 600b is combined with the second side frame 100b and the second grid arm 422.

[0307] The first arc runner 600a and the second arc runner 600b can be symmetrically formed with respect to the vertical direction. Although the first arc runner 600a and the second arc runner 600b have some differences in their placement and directionality, their structures and functions are identical. Therefore, in the following description, the first arc runner 600a and the second arc runner 600b are collectively referred to as arc runners 600.

[0308] In the illustrated embodiment, only the guide space 620 is formed inside the first arc guide 600a, while the second arc guide 600b is further provided with a grid support member 630. This is for ease of understanding and explanation, and it should be understood that the grid support member 630 may also be provided in the guide space 620 of the first arc guide 600a to support the grid arm 420.

[0309] exist Figure 11 and Figure 12 In the illustrated embodiment, the arc guide 600 includes a guide body 610 , a guide space 620 , a grid support member 630 , and a flow channel accommodating space 640 .

[0310] The guide body 610 forms a main body of the arc guide 600. The guide body 610 is a portion of the arc guide 600 that is exposed to the outside. The guide body 610 may directly contact the generated arc (Arc).

[0311] In one embodiment, the guide body 610 can be formed of any material that can generate gas using heat or pressure. In one embodiment, the guide body 610 can be formed of any gas-generating material, such as nylon, melamine, polyamide 46 (PA46), polyamide 66 (PA66), polyamide (PA), methyl methacrylate (MMA), polyoxymethylene (POM), or polybutylene terephthalate (PBT).

[0312] In the embodiment, the guide body 610 can react with the generated arc to generate gas, thereby rapidly extinguishing the arc and moving it outside the arc extinguishing device 10 due to the pressure of the generated gas.

[0313] In another embodiment, the guide body 610 may be formed of any material that is arc resistant. In one embodiment, the guide body 610 may be formed of a BMC (Bulk Molding Compound) material.

[0314] In the embodiment, the guide body 610 can minimize damage caused by the generated arc, thereby minimizing damage to the arc guide 600 and the side frame 100 or the grid portion 400 coupled thereto.

[0315] The guide body 610 is coupled to each of the plurality of grid sections 400. The guide body 610 is coupled to and covers the grid arms 420 of the plurality of grid sections 400. This minimizes the contact area between the grid arms 420 and the generated arc, thereby preventing damage to the grid arms 420.

[0316] The guide body 610 may be formed in a shape corresponding to the arrangement of the plurality of grille portions 400. In the illustrated embodiment, the guide body 610 is formed to extend in the front-rear direction.

[0317] In the illustrated embodiment, the guide body 610 includes a first guide body 611 and a second guide body 612 .

[0318] The first guide body 611 forms a portion of the guide body 610. The first guide body 611 is coupled to either the first grille 400a or the second grille 400b of the grille portion 400.

[0319] In the illustrated embodiment, the first guide body 611 forms the front side of the guide body 610. The first guide body 611 is coupled to the grille arm 420 of the first grille 400a disposed toward the front side.

[0320] The first guide body 611 may be shaped corresponding to the grille arm 420 of the first grille 400a. In the illustrated embodiment, the first guide body 611 is shaped like a polygonal column having a triangular cross-section and extending in the front-rear direction.

[0321] A first guide space 621 of the guide spaces 620 is formed inside the first guide body 611 . The grille arms 420 of the first grille 400 a are received in the first guide space 621 .

[0322] At this time, the extension length of the first guide body 611 can be determined according to the arrangement length of the plurality of grille sections 400 included in the first grille 400a. In other words, the first guide body 611 can be extended by an amount corresponding to the distance between the grille section 400 located at the frontmost side and the grille section 400 located at the rearmost side in the first grille 400a.

[0323] The height of the first guide body 611 can be determined corresponding to the length of the grille arm 420 of the first grille 400a, and in the illustrated embodiment, the length is determined in the vertical direction. In this case, the height of the first guide body 611 and the height of the second guide body 612 can form a size relationship corresponding to the size relationship between the first height H1 and the second height H2.

[0324] That is, Figure 8 and Figure 12 As shown, the third height H3, which is the height of the first guide body 611, is greater than the fourth height H4, which is the height of the second guide body 612. It can be understood that this size relationship corresponds to the size relationship between the grille arms 420 of the first grille 400a coupled to the first guide body 611 and the grille arms 420 of the second grille 400b coupled to the second guide body 612.

[0325] In one embodiment, a difference between the third height H3 , which is the height of the first guide body 611 , and the fourth height H4 , which is the height of the second guide body 612 , may be greater than a difference between the first height H1 and the second height H2 .

[0326] The second guide body 612 forms another portion of the guide body 610. The second guide body 612 is coupled to the other of the first grille 400a and the second grille 400b of the grille portion 400.

[0327] In the illustrated embodiment, the second guide body 612 forms a rear side of the guide body 610. The second guide body 612 is combined with the grille arm 420 of the second grille 400b located at the rear side.

[0328] The second guide body 612 may be shaped to correspond to the grille arms 420 of the second grille 400b. In the illustrated embodiment, the second guide body 612 is shaped like a polygonal column having a triangular cross-section and extending in the front-rear direction.

[0329] A second guide space 622 of the guide space 620 is formed inside the second guide body 612. The grille arm 420 of the second grille 400b is accommodated in the second guide space 622.

[0330] At this time, the extension length of the second guide body 612 can be determined according to the arrangement length of the plurality of grille sections 400 included in the second grille 400b. That is, the second guide body 612 can extend by an amount corresponding to the distance between the grille section 400 located at the frontmost side and the grille section 400 located at the rearmost side of the second grille 400b.

[0331] The height of the second guide body 612 can be determined corresponding to the length of the grille arm 420 of the second grille 400b, and in the illustrated embodiment, the length in the vertical direction. As described above, the height of the second guide body 612 and the height of the first guide body 611 can form a size relationship corresponding to the size relationship between the first height H1 and the second height H2.

[0332] In one embodiment, a difference between the fourth height H4 , which is the height of the second guide body 612 , and the third height H3 of the first guide body 611 may be greater than a difference between the first height H1 and the second height H2 .

[0333] The guide space 620 is a space formed inside the guide body 610. A portion of the guide space 620 is surrounded by the guide body 610. Another portion of the guide body 610 is open and can accommodate at least a portion of the grille arm 420 of the grille portion 400.

[0334] In the illustrated embodiment, the guide space 620 is open at its upper side and outer side in the width direction. Furthermore, the guide space 620 is surrounded by the guide body 610 at its front, rear, bottom, and inner sides. The grille arm 420 accommodated in the guide space 620 can be supported by the guide body 610 and the grille support member 630.

[0335] The guide space 620 may be shaped corresponding to the shape of the guide body 610. In the illustrated embodiment, the guide space 620 is formed as a polygonal column-shaped space having a triangular cross-section and a height in the front-rear direction.

[0336] The guide space 620 can be divided into a plurality of spaces. A portion of the plurality of guide spaces 620 is formed inside the first guide body 611 and can accommodate the grille arms 420 of the first grille 400a. Another portion of the plurality of guide spaces 620 is formed inside the second guide body 612 and can accommodate the grille arms 420 of the second grille 400b.

[0337] In the illustrated embodiment, the guide space 620 includes a first guide space 621 formed in the first guide body 611 and a second guide space 622 formed in the second guide body 612 .

[0338] The first guide space 621 accommodates the grille arm 420 of the first grille 400a. The upper side and the outer side of each side of the first guide space 621 are open, and the grille arm 420 can be introduced into or out of the first guide space 621 through the upper side and the outer side.

[0339] The first guide space 621 is communicated with the second guide space 622 .

[0340] The second guide space 622 accommodates the grille arms 420 of the second grille 400b. The upper and outer sides of the second guide space 622 are open, and the grille arms 420 can be introduced into or out of the second guide space 622 via the upper and outer sides.

[0341] A grille support member 630 is disposed in the guide space 620 .

[0342] The grid support member 630 supports the grid arms 420 accommodated in the guide space 620. The grid arms 420 are maintained in a state of being spaced apart from each other by the grid support member 630 and may be combined with the arc guide 600.

[0343] The grille support member 630 divides the guide space 620 into a plurality of small spaces and is formed in a shape corresponding to the guide body 610. In the illustrated embodiment, the grille support member 630 is formed in a polygonal plate shape having a triangular cross section and a thickness in the front-to-rear direction.

[0344] A plurality of grille support members 630 may be provided. The plurality of grille support members 630 may be spaced apart from each other and arranged side by side along the extending direction of the guide body 610. In the illustrated embodiment, the plurality of grille support members 630 are spaced apart from each other and arranged side by side along the front-to-rear direction.

[0345] The grille support members 630 may be located in the first guide space 621 and the second guide space 622. At this time, the grille support members 630 located in the first guide space 621 may be formed to have a height greater than that of the grille support members 630 located in the second guide space 622.

[0346] Thus, the grill arms 420 respectively received in the first guide space 621 and the second guide space 622 may be stably supported.

[0347] In one embodiment, the grid arms 420 can be inserted and coupled to a plurality of spaces partitioned by the grid support members 630. In this embodiment, the portion of the guide space 620 that is open toward the arc generation direction (i.e., the inner side of the pair of grid arms 420) is eliminated. This prevents insulation breakdown of various components of the arc extinguishing device 10, such as the side frame 100, the grid portion 400, and the arc guide 600.

[0348] The flow channel accommodating space 640 is a space formed at the lower side of the guide body 610. The flow channel accommodating space 640 accommodates the flow channel extending portion 530 of the arc flow channel 500.

[0349] A portion of the flow channel accommodating space 640 is surrounded and defined by the guide body 610. In the illustrated embodiment, the front and upper sides of the flow channel accommodating space 640 are respectively surrounded by the first guide body 611 and the second guide body 612. The rear and lower sides of the flow channel accommodating space 640 are open to accommodate the arc flow channel 500.

[0350] The flow channel accommodating space 640 may be formed to have a predetermined height. In the illustrated embodiment, the height of the flow channel accommodating space 640 is defined as a fourth height H4. The difference between the third height H3 and the fourth height H4 may be defined as the height of the second guide body 612.

[0351] 4. Description of the Operation Process of the Arc Extinguishing Device 10 According to the Embodiment of the Present Invention

[0352] The arc extinguishing device 10 of the embodiment of the present invention can prevent the generated arc from moving toward the grid arms 420 of the grid portion 400. Therefore, the generated arc can move along the grid body 410 of the grid portion 400 toward other grid portions 400. As a result, the arc can be quickly cooled, split, and extinguished.

[0353] In addition, the arc extinguishing device 10 according to the embodiment of the present invention can allow the arc (Arc) that has not flowed out to the outside after passing through the grid portion 400 to circulate and move back to the grid portion 400 without stagnation.

[0354] Furthermore, a portion of the grid portion 400 disposed close to the generated arc (Arc) may be protected by the arc guide 600. In this case, the arc guide 600 surrounds the portion of the grid portion 400, thereby minimizing insulation breakdown.

[0355] Below, refer to Figure 13 and Figure 14 , a detailed description is given of the process of extinguishing the arc generated in the arc extinguishing device 10 according to an embodiment of the present invention.

[0356] Reference Figure 13 and Figure 14, as an example, shows the progress of the arc (Arc) generated when the movable contact and the fixed contact are separated.

[0357] As the movable contact moves toward the arc flow path 500, an arc extends from the front to the rear. The extended arc travels toward the space between the plurality of grid portions 400, is extinguished, passes through the support frame 200 and the cover frame 300, and is discharged to the outside.

[0358] At this time, the end of the arc channel extension portion 530 of the arc channel 500 extends to a position adjacent to the fully moved movable contact seat, thereby allowing the arc extending along the movable contact seat to be guided toward the grid portion 400 by the arc channel 500 .

[0359] In addition, a portion of the arc (Arc) that has passed through the grid portion 400 collides with the plate body 222 and cannot flow outward, and instead moves back into the arc extinguishing device 10. The returning arc (Arc) can move back into the grid portion 400 through the circulation space 540 of the arc flow channel 500.

[0360] Although the embodiments of the present invention have been described, the technical ideas of the present invention are not limited to the embodiments described in this specification. Those skilled in the art who understand the technical ideas of the present invention can easily propose other implementation plans within the scope of the same idea by adding, modifying, deleting or supplementing constituent elements, and these modified plans should also be regarded as belonging to the scope of protection of the present invention.

[0361] Description of Reference Numerals

[0362] 10: Arc extinguishing device 100: Side frame

[0363] 100a: First side frame 100b: Second side frame

[0364] 110: Side body 120: Support frame connection part

[0365] 130: Grille joint 131: First grille joint

[0366] 132: Second grille joint 133: Third grille joint

[0367] 140: Arc channel joint 141: First arc channel joint

[0368] 142: Second arc channel joint 143: Third arc channel joint

[0369] 144: Fourth arc flow channel joint 150: Side fastening hole

[0370] 151: First side fastening hole 152: Second side fastening hole

[0371] 160: Side space 200: Support frame

[0372] 210: Support body 211: Board storage part

[0373] 212: Plate support 213: Buffer space

[0374] 214: Support frame combined with protrusion 220: Support plate

[0375] 221: Plate connecting hole 222: Plate body

[0376] 230: Screen plate 300: Cover frame

[0377] 310: Cover body 320: Cover through hole

[0378] 330: Cover rib 400: Grille

[0379] 400a: First grid 400b: Second grid

[0380] 410: Grille body 420: Grille arm

[0381] 421: First grille arm 422: Second grille arm

[0382] 430: Arc induction space 440: Arc extension space

[0383] 450: Grille joint protrusion 451: First grille joint protrusion

[0384] 452: Second grille joint protrusion 453: Third grille joint protrusion

[0385] 460: frame joint protrusion 500: arc flow channel

[0386] 510: Runner body 520: Runner arm

[0387] 521: First flow channel arm 522: Second flow channel arm

[0388] 530: Flow channel extension 531: First flow channel extension

[0389] 532: Second flow channel extension 533: Third flow channel extension

[0390] 540: Circulation space 550: Flow channel junction

[0391] 551: First flow channel junction 552: Second flow channel junction

[0392] 553: Third flow channel junction 554: Fourth flow channel junction

[0393] 560: Flow channel space 600: Arc guide

[0394] 600a: First arc runner 600b: Second arc runner

[0395] 610: Guiding body 611: First guiding body

[0396] 612: Second guide body 620: Guide space

[0397] 621: First guide space 622: Second guide space

[0398] 630: Grid support member 640: Flow channel accommodation space

[0399] Arc: Arc H1: First Height

[0400] H2: second height H3: third height

[0401] H4: fourth height

Claims

1. An arc extinguishing device, wherein: include: a grid portion located near an external fixed contact and a movable contact to extinguish an arc generated when the fixed contact and the movable contact are separated; an arc guide, coupled to the grid portion and extending in a direction to react with the generated arc to generate gas; as well as an arc flow channel located close to the grid portion and the arc guide, respectively, to guide the generated arc toward the grid portion; The grille portion includes: A plurality of first grids extending at a predetermined height and spaced apart along the one direction; as well as a plurality of second grilles, located close to the plurality of first grilles, extending at a height lower than the predetermined height, and spaced apart along the one direction; The arc flow channel is located in a space surrounded by a plurality of the second grids and a plurality of the first grids.

2. The arc extinguishing device according to claim 1, wherein: The arc guide comprises: a guide body surrounding at least a portion of the first grille and the second grille; and A guide space is formed inside the guide body and accommodates at least a portion of the first grille and the second grille.

3. The arc extinguishing device according to claim 2, wherein: The guiding body comprises: a first guide body formed to surround at least a portion of the first grille and having a predetermined height; and The second guide body is formed to be continuous with the first guide body, surrounds at least a portion of the second grille, and has a height lower than the predetermined height.

4. The arc extinguishing device according to claim 2, wherein: The guide space includes: a first guide space accommodating at least a portion of the first grille; and a second guide space communicating with the first guide space and accommodating at least a portion of the second grille; A height of the first guide space is greater than a height of the second guide space.

5. The arc extinguishing device according to claim 2, wherein: The arc guide includes a plurality of grid support members. The plurality of grid support members are located in the guide space and are spaced apart from each other along the one direction to divide the guide space into a plurality of small spaces.

6. The arc extinguishing device according to claim 1, wherein: The arc flow channel comprises: a flow channel body arranged facing the plurality of first grids with the plurality of second grids interposed therebetween along the one direction; and The flow channel extension portion is continuous with one end portion of the flow channel body and extends toward the first grid.

7. The arc extinguishing device according to claim 6, wherein: The flow channel extension portion includes: a first flow channel extension portion, forming a predetermined angle with the flow channel main body and being continuous with the flow channel main body; a second flow channel extension portion, forming a predetermined angle with the first flow channel extension portion and being continuous with the first flow channel extension portion; and The third flow channel extension portion forms a predetermined angle with the second flow channel extension portion and is continuous with the second flow channel extension portion.

8. The arc extinguishing device according to claim 7, wherein: The first flow channel extension portion extends perpendicularly to the flow channel body; The second flow channel extension portion extends at an obtuse angle to the first flow channel extension portion; The third flow channel extension portion extends at an obtuse angle to the second flow channel extension portion; The third flow passage extension is closer to the arc guide than the first flow passage extension.

9. The arc extinguishing device according to claim 7, wherein: The edge corners in the width direction of the end portion in the extending direction of the third flow channel extension portion are chamfered.

10. The arc extinguishing device according to claim 6, wherein: The arc flow channel includes a flow channel arm that is continuous with the other end of the flow channel body and extends outward.

11. The arc extinguishing device according to claim 10, wherein: The flow channel arms are provided in plurality, and the plurality of flow channel arms are spaced apart from each other along the width direction of the flow channel body; The arc flow channel includes a circulation space surrounded and defined by the flow channel body and the plurality of flow channel arms, and the circulation space is open so that the space where the plurality of grid portions are located communicates with the outside.

12. The arc extinguishing device according to claim 10, wherein: including side frames respectively combined with the arc flow channel and the arc guide; The arc runner includes a runner coupling portion that protrudes outward from an end portion in a width direction of the arc runner and is coupled to the side frame.

13. The arc extinguishing device according to claim 12, wherein: The flow channel junction includes: A first flow channel joint portion and a second flow channel joint portion protrude outward from an end portion in the width direction of the flow channel arm; a third flow channel joint portion protruding outward from an end portion in the width direction of the flow channel body; and The fourth flow channel joint portion protrudes outward from an end portion in the width direction of the flow channel extension portion.

14. The arc extinguishing device according to claim 12, wherein: The side frame includes an arc flow channel coupling portion, which is formed through the side frame in a thickness direction and coupled to the flow channel coupling portion.

15. The arc extinguishing device according to claim 1, wherein: The arc flow path extends to any one of the plurality of second grids that is closest to the first grid.

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