Arc extinguishing device

Abstract

The invention discloses an arc extinguishing device. The arc extinguishing device according to one aspect of the present invention comprises: a grid portion located at a position close to an external fixed contact and a movable contact to extinguish an arc generated by separation of the fixed contact and the movable contact; and an arc guide coupled to the grid portion and generating a gas by reacting with the generated arc, the grid portion includes: a grid main body forming a main body of the grid portion, the grid main body being disposed at a distance from the fixed contact and the movable contact; a grid arm which is continuous with the grid main body and extends toward the fixed contact and the movable contact; and an arc extension space formed such that a part thereof is surrounded by the grid body and the grid arm, the movable contact being movably accommodated in the arc extension space; and an arc guide coupled to a portion of the grid arm surrounding the arc extension space to generate a gas using heat of the generated arc.

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 action. Background Art

[0002] The circuit breaker is installed in the power system and can be electrically connected to the power supply and load respectively. If an abnormal current occurs between the power supply and the load, the circuit breaker performs a disconnection action to cut off the power supply and the load. Therefore, the power supply and the load can be prevented from being damaged by the abnormal current.

[0003] Generally, a circuit breaker includes a fixed contact that is fixedly arranged and a movable contact that is movably arranged. The movable contact can be arranged to move in the direction of the fixed contact or in the opposite direction to the fixed contact. When the movable contact is in contact with the fixed contact, the power supply and the load can be energized to each other. When an abnormal current occurs, the movable contact is separated from the fixed contact, so that the energized state of the power supply and the load is released.

[0004] Even at the moment when the movable contact and the fixed contact are separated, the current, i.e., the abnormal current, is still in the energized state through the movable contact and the fixed contact. Therefore, when the movable contact and the fixed contact are separated, the energy of the energized current is converted into a high-temperature, high-pressure electron flow. The converted electron flow is called an arc.

[0005] As mentioned above, an arc is a high-temperature, high-pressure electron flow. Therefore, if the arc is not discharged to the outside of the circuit breaker, but is retained inside the circuit breaker, the heat or pressure of the arc may cause damage to other components of the circuit breaker. Therefore, it is necessary to reduce the temperature and pressure of the generated arc, and to discharge the generated arc to the outside. This process is called the arc extinguishing process.

[0006] In order to extinguish the arc, the arc needs to be sufficiently and quickly extended. In addition, the extended arc also needs to be able to be divided into arcs of shorter lengths (usually, called small arcs) and discharged to the outside. For this reason, the circuit breaker usually has an arc extinguishing device including a plurality of grids.

[0007] In recent years, as renewable energy such as solar energy has attracted much attention, the demand for disconnection of not only large currents but also small currents has increased. Compared with large currents, the energy and pressure of the arc generated by small currents are too small. Therefore, if the arc extinguishing device used in large currents is directly used, it is difficult to generate enough energy to lengthen, split and induce the arc.

[0008] Therefore, in the case of an arc extinguishing device provided in a circuit breaker for interrupting a small current, it is necessary to provide additional energy to elongate and split the generated arc.

[0009] Korean Patent Document No. 10-1031975 discloses an arc extinguishing device for a DC switch, and specifically discloses an arc extinguishing device for a DC switch that can induce an arc by using permanent magnets that are arranged opposite to each other with a fixed contact and a movable contact interposed therebetween.

[0010] However, the arc extinguishing device disclosed in the prior art requires an additional permanent magnet to extinguish the arc. As the circuit breaker is continuously used, the magnetic force may weaken, or the permanent magnet may be damaged due to the generated arc, so that the ability to extinguish the arc may decrease.

[0011] Korean Patent Document No. 10-1986552 discloses an arc extinguishing device for a DC air circuit breaker, and specifically discloses an arc extinguishing device for a DC air circuit breaker that can extinguish an arc generated by using an arc guide and a seal disposed adjacent to each other at the end of a grid.

[0012] However, the arc extinguishing device disclosed in the prior art is only provided with an arc guide in a portion adjacent to the fixed contact. Therefore, although the arc starting from the fixed contact can be partially induced, it is not possible to provide a solution for extinguishing all the arcs that are stretched along with the movement of the movable contact.

[0013] Furthermore, none of the prior arts provides a solution for extinguishing an arc generated when a small current other than a large current is disconnected and providing additional energy.

[0014] Korean Patent No. 10-1031975 (2011.05.09.)

[0015] Korean Patent No. 10-1986552 (2019.06.07.) Summary of the invention

[0016] Problem that the invention aims to solve

[0017] The present invention aims to solve the above-mentioned problem, and its object is to provide an arc extinguishing device with a structure capable of providing the energy required for extinguishing the generated arc.

[0018] Another object of the present invention is to provide an arc extinguishing device that can effectively extinguish an arc even when the energy of a generated arc is too small.

[0019] Another object of the present invention is to provide an arc extinguishing device with a structure capable of inducing a generated arc to a suitable position for extinguishing.

[0020] Another object of the present invention is to provide an arc extinguishing device having a structure that can extinguish a generated arc without requiring excessive design changes.

[0021] Another object of the present invention is to provide an arc extinguishing device with a structure that maximizes the arc extinguishing effect through various deformations.

[0022] The subject matter of the present invention is not limited to the above-mentioned contents, and other subjects not mentioned can be clearly understood by those skilled in the art from the following description.

[0023] Means used to solve problems

[0024] According to one aspect of the present invention, there is provided an arc extinguishing device, comprising: a grid portion, located near an external fixed contact and a movable contact, so as to extinguish an arc generated by the separation of the fixed contact and the movable contact; and an arc guide, combined with the grid portion, reacting with the generated arc to generate gas; the grid portion comprises: a grid body, forming the main body of the grid portion and configured to be separated from the fixed contact and the movable contact; a grid arm, continuous with the grid body and extending toward the fixed contact and the movable contact; and an arc extension space, formed so that a portion of it is surrounded by the grid body and the grid arm, and the movable contact is movably accommodated in the arc extension space; the arc guide is combined with a portion of the grid arm surrounding the arc extension space, so as to generate gas using the heat of the generated arc.

[0025] Here, an arc extinguishing device is provided, wherein the grid body extends in a direction different from that of the grid arm; the grid arm comprises: a first grid arm, located on one side of the extension direction biased toward the grid body; and a second grid arm, located on the other side of the extension direction biased toward the grid body, the second grid arm and the first grid arm being arranged relative to each other with the arc extension space between them.

[0026] In addition, an arc extinguishing device is provided, wherein the arc guide comprises: a first arc guide coupled to the first grid arm; and a second arc guide coupled to the second grid arm, wherein the second arc guide is arranged opposite to the first arc guide with the arc extension space interposed therebetween.

[0027] Here, an arc extinguishing device is provided, wherein the arc guide comprises: an inner arc guide coupled to the grid arm; and an outer arc guide accommodating the inner arc guide and exposed in the arc extension space.

[0028] Furthermore, there is provided an arc extinguishing device, wherein the outer arc guide is formed of a gassing material that generates gas using heat of the generated arc.

[0029] Here, an arc extinguishing device is provided, wherein the external arc guide is formed of any one or more materials selected from the group consisting of nylon, melamine, PA46, PA66, polyamide resin (PA), methyl methacrylate (MMA), polyoxymethylene resin (POM) and polybutylene terephthalate (PBT).

[0030] Furthermore, an arc extinguishing device is provided, wherein the inner arc guide is formed of an arc resistance material.

[0031] Here, an arc extinguishing device is provided, wherein the internal arc guide is formed of a BMC (Bulk Molding Compound) material.

[0032] In addition, an arc extinguishing device is provided, wherein the internal arc guide comprises: a grid receiving portion, which is recessed from a side of the internal arc guide facing the grid portion to receive the grid arm; and a guide rib portion, which surrounds a portion of the grid receiving portion and extends to support the received grid arm.

[0033] Here, an arc extinguishing device is provided, wherein a plurality of grid portions are provided, and the plurality of grid portions are spaced apart from each other and arranged side by side along a direction; a plurality of grid receiving portions and a plurality of guide rib portions are provided, and the plurality of grid receiving portions and the plurality of guide rib portions are alternately arranged with each other along the one direction.

[0034] In addition, an arc extinguishing device is provided, wherein the external arc guide comprises: an external space for accommodating the internal arc guide; and a plurality of external surfaces surrounding the external space from a plurality of directions and being continuous with each other; the external space is open toward one side of the grid arm.

[0035] Here, an arc extinguishing device is provided, wherein the external arc guide comprises: an external space, which accommodates the internal arc guide and extends longer in one direction; a first external surface, which surrounds the external space from one end in one direction; a second external surface, which is continuous with the first external surface and surrounds the external space from one side in the extension direction of the grid arm; and a third external surface, which is continuous with the second external surface and surrounds the external space from the other end in the one direction.

[0036] Furthermore, an arc extinguishing device is provided, wherein the external arc guide includes a fourth external surface that is continuous with the first external surface, the second external surface, and the third external surface, respectively, and surrounds the external space from one side in the width direction of the grid body.

[0037] Here, an arc extinguishing device is provided, wherein a pair of internal arc guides and a pair of external arc guides are respectively provided, and the pair of internal arc guides are respectively accommodated in the external spaces respectively provided in the pair of external arc guides; the pair of internal arc guides are relatively arranged across a pair of the fourth external surfaces respectively provided in the pair of external arc guides.

[0038] In addition, an arc extinguishing device is provided, further comprising a side frame respectively coupled to the grid portion and the arc guide; the side frame is coupled to the grid portion at a plurality of locations.

[0039] Here, an arc extinguishing device is provided, wherein the grid portion comprises: a plurality of grid combining protrusions protruding from each end portion in the width direction of the grid body and the width direction of the grid arm toward the side frame; the side frame comprises: a plurality of grid combining portions formed to penetrate the interior of the side frame and respectively accommodate a plurality of the grid combining protrusions.

[0040] In addition, an arc extinguishing device is provided, wherein the arc guide comprises: an external fastening hole, which is recessed on a side of the arc guide facing the side frame; the side frame comprises: a side fastening hole, which is formed to pass through the interior of the side frame corresponding to the external fastening hole; and a side fastener, which passes through the side fastening hole and is inserted into the external fastening hole.

[0041] Effects of the Invention

[0042] According to the above structure, the arc extinguishing device of the embodiment of the present invention can provide the required energy for extinguishing the generated arc.

[0043] The generated arc is elongated, divided, cooled, and extinguished through a plurality of grid parts. The grid part includes a grid body that actually performs the arc extinguishing process and a grid arm that is continuous with the grid body and extends outward. The grid arm is combined with an arc guide.

[0044] The arc guide includes an inner arc guide directly combined with the grid arm and an outer arc guide surrounding the inner arc guide and exposed to the outside. The outer arc guide is formed of a material that can generate gas using heat, that is, a gassing material. If an arc is generated, the outer arc guide generates gas using the heat generated together with the arc.

[0045] The generated gas is formed in the arc generating area. That is, the arc generating area has a higher pressure than the space where the grid body is located or the outside of the arc extinguishing device due to the generated gas. According to the pressure difference, the generated arc moves to the grid part.

[0046] Therefore, it is possible to provide energy required for the generated arc to extend and advance toward the grid portion.

[0047] Furthermore, according to the above configuration, the arc extinguishing device according to the embodiment of the present invention can effectively extinguish the arc even when the energy of the generated arc is too small.

[0048] As described above, the external arc guide generates gas using heat generated by the arc. The pressure difference generated by the generated gas applies a transfer force to move the generated arc to the grid portion and even to the outside of the arc extinguishing device.

[0049] Therefore, when the energy of the generated arc itself is too small, the pressure applied by the gas can make the arc easily move or extend to the outside of the grid portion and the arc extinguishing device. Therefore, even when the arc extinguishing device and the circuit breaker provided with the arc extinguishing device apply a small current, the generated arc can be effectively extinguished.

[0050] Furthermore, according to the above configuration, the arc extinguishing device according to the embodiment of the present invention can induce the generated arc to a suitable position to extinguish the generated arc.

[0051] The arc tends to move toward the tip. In the grid portion, the grid arm forming the tip is combined with the internal arc guide. The internal arc guide is formed of an arc-resistant material, thereby preventing the arc from moving.

[0052] Therefore, the arc entering the grid part can travel along the grid body formed in the plate shape to the grid part located nearby. Therefore, compared with the case where the arc travels to other grid parts using the grid arms, the arc splitting and cooling effects can be improved.

[0053] As a result, the arc extinguishing effect can be enhanced.

[0054] Furthermore, according to the above configuration, the arc extinguishing device according to the embodiment of the present invention can extinguish the generated arc without requiring excessive design changes.

[0055] The arc runner includes an external arc runner located outside and generating gas by utilizing heat, and an internal arc runner housed in the external arc runner and directly coupled to the grid arm.

[0056] Thus, a single arc guide can simultaneously perform the following functions: provide energy for the arc; insulate between the plurality of grid sections and conduct the arc within the grid body.

[0057] The arc guide is combined with the side frame and the guide arm. A side fastening hole is formed through the inside of the side frame, and an external fastening hole is formed in the arc guide. The side fastener passes through the side fastening hole and is inserted into the external fastening hole. Therefore, the arc guide can be combined with the side frame.

[0058] A grid receiving portion is formed in a recessed manner inside the arc guide, and the grid arm is inserted and coupled to the grid receiving portion, so that the arc guide can be coupled to the grid portion.

[0059] Therefore, there is no need to make excessive design changes in order to install the arc guide. Therefore, the arc guide can also be applied to existing products, thereby improving productivity.

[0060] In addition, according to the above configuration, the arc extinguishing device of the embodiment of the present invention can maximize the arc extinguishing effect through various deformations.

[0061] In one embodiment, the arc guide may be provided with an additional component. The additional component may be formed of a gas generating material like the outer arc guide, using the heat of the arc to generate additional gas. Alternatively, the additional component may be formed of an arc resistant material like the inner arc guide, thereby strengthening the insulation between the plurality of grid parts.

[0062] Therefore, the effect of the arc runner can be further enhanced through various deformations of the arc runner.

[0063] The present invention is not limited to the above-mentioned effects, and 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

[0064] Figure 1 1 is a perspective view showing an arc extinguishing device according to an embodiment of the present invention.

[0065] Figure 2 It is shown Figure 1 AA cross-sectional view of the arc extinguishing device.

[0066] Figure 3 It is shown Figure 1 BB cross-sectional view of the arc extinguishing device.

[0067] Figure 4 It is shown Figure 1 An exploded perspective view of the structure of the arc extinguishing device.

[0068] Figure 5 It is shown Figure 1 A side view of a side frame provided in an arc extinguishing device.

[0069] Figure 6 It is shown Figure 1 A three-dimensional view of a supporting body of a supporting frame provided in an arc extinguishing device.

[0070] Figure 7 It is shown Figure 6 A top view of a support plate arranged in a support frame.

[0071] Figure 8 It is shown Figure 6 A three-dimensional view of a mesh panel set in a support frame.

[0072] Fig. 9 It is shown Figure 1 A top view of a cover frame provided in an arc extinguishing device.

[0073] Fig.10 It is shown Figure 1 A three-dimensional view of a grid portion provided in an arc extinguishing device.

[0074] Fig.11 It is shown Fig.10 Bottom view of the grid portion.

[0075] Fig.12 It is shown Fig.10 Front view of the grid portion.

[0076] Fig.13 It is shown Figure 1 A three-dimensional view of an arc runner provided in an arc extinguishing device.

[0077] Fig.14 It is shown Figure 1 An exploded perspective view of an arc guide (arc guide) provided in an arc extinguishing device.

[0078] Fig.15 It is shown Fig.14 Right side view of the arc guide.

[0079] Fig.16 It is shown Fig.14 Left side view of the arc guide.

[0080] Figures 17 to 19 It is a usage state diagram showing the operation process of the arc extinguishing device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0081] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that a person skilled in the art can easily implement the present invention. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted in the accompanying drawings, and the same reference numerals are used throughout the specification for the same or similar components.

[0082] The words and terms used in this specification and claims should not be limited to the conventional or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical ideas of the present invention based on the principle that the inventor has the right to define terms and concepts in order to best explain his invention.

[0083] Therefore, the embodiments described in this specification and the structures shown in the accompanying drawings only correspond to a preferred embodiment of the present invention and cannot fully represent the technical concept of the present invention. When the present invention is applied for, the structures may have multiple equivalent replacement schemes and variations.

[0084] In the following description, description of some components may be omitted in order to clarify the features of the present invention.

[0085] 1. Definition of terms

[0086] The term "connected" mentioned in the following description means that one or more components are connected in a manner that allows fluid to flow. In one embodiment, the connection can be formed by components such as pipes, ducts, and piping. In the following description, the connection can also be used in the same meaning as one or more components are "fluidically connected" to each other.

[0087] The term "energized" mentioned in the following description means that one or more components are connected in a manner that can transmit current or electrical signals. In one embodiment, energization can be achieved by wired means such as wire components, or by wireless means such as Bluetooth, Wi-Fi, RFID (radio frequency identification), etc. In one embodiment, energization can include the meaning of "communication".

[0088] 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.

[0089] 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.

[0090] 2. Description of the structure of the arc extinguishing device 10 according to the embodiment of the present invention

[0091] Reference Figures 1 to 4 , an arc extinguishing device 10 according to an embodiment of the present invention is shown. The arc extinguishing device 10 of the illustrated embodiment is disposed in a circuit breaker (not shown) energized with an external power source and load. The arc extinguishing device 10 can discharge an arc generated by the separation of a fixed contact and a movable contact to the outside of the circuit breaker (not shown) and extinguish it.

[0092] In one embodiment, the arc extinguishing device 10 can be arranged in a circuit breaker (not shown) with a small current. Therefore, compared with the case where the arc extinguishing device 10 is arranged in a circuit breaker (not shown) with a large current, the arc extinguishing device 10 of the embodiment of the present invention includes a different structure, which will be described later.

[0093] 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, each component of the arc extinguishing device 10 will be described in detail with reference to the drawings, and the arc guide 600 will be described separately.

[0094] (1) Description of the side frame 100

[0095] The side frame 100 constitutes a part of the outer shape of the arc extinguishing device 10. The side frame 100 is combined with other components of the arc extinguishing device 10, namely, the support frame 200, the cover frame 300, the grid portion 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 grid portion 400, the arc flow channel 500, and the arc guide 600.

[0096] The side frame 100 is combined with the support frame 200. In the illustrated embodiment, the upper side end portion of the side frame 100 is combined with the support frame 200.

[0097] The side frame 100 is coupled to the cover frame 300. In the illustrated embodiment, the upper side end portion of the side frame 100 is indirectly coupled to the cover frame 300 using the support frame 200.

[0098] The side frame 100 is combined with the grille part 400. In the illustrated embodiment, the inner portion of the side frame 100 is combined with each end portion of the grille part 400 in the width direction.

[0099] The side frame 100 is combined with the arc flow channel 500. In the illustrated embodiment, the rear side portion of the side frame 100 is combined with the arc flow channel 500.

[0100] 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.

[0101] A plurality of side frames 100 may be provided. The plurality of side frames 100 are spaced apart from each other and may be combined with various components of the arc extinguishing device 10 at different positions. 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, and a total of two side frames 100 are provided.

[0102] The first side frame 100a is coupled to the left side portion of the arc extinguishing device 10. The second side frame 100b is coupled to the right side portion 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.

[0103] 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".

[0104] exist Figures 4 to 5 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 , a side fastening hole 150 , and a side fastener 160 .

[0105] 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.

[0106] The side body 110 may be any shape that can be combined with other components of the arc extinguishing device 10 and support them. In the illustrated embodiment, the side body 110 is configured as a plate having a height in the up-down direction, a width in the front-back direction, and a thickness in the left-right direction.

[0107] One side end portion in the height direction of the side body 110, which is the upper side end portion in the illustrated embodiment, may be formed to have a shorter width than the other side in the height direction of the side body 110, which is the middle side portion and the lower side in the illustrated embodiment. The one side end portion of the side body 110, which is the upper side end portion, is coupled to the support frame 200.

[0108] The other side of the side body 110 in the height direction, which is the middle side portion in the embodiment shown, is combined with the grid portion 400 and the arc flow channel 500. The other side end of the side body 110 in the height direction, which is the lower side end in the embodiment shown, is combined with the arc guide 600.

[0109] A support frame coupling portion 120 , a grid coupling portion 130 , an arc flow channel coupling portion 140 , and a side fastening hole 150 are formed through the inside of the side body 110 .

[0110] The support frame coupling part 120 is a part where the side body 110 is coupled to the support frame 200. The support frame coupling part 120 is formed to penetrate in the thickness direction of the side body 110, which is the left-right direction in the illustrated embodiment. The support frame coupling protrusion 214 coupled with the support frame 200 is inserted into the support frame coupling part 120.

[0111] The support frame coupling portion 120 may be any shape capable of accommodating the support frame coupling protrusion 214. In the illustrated embodiment, the support frame coupling portion 120 is a space having a rectangular cross-section whose length in the front-to-back direction is longer than that in the up-down direction. The shape of the support frame coupling portion 120 may be changed according to the shape of the support frame coupling protrusion 214.

[0112] The support frame coupling part 120 is formed to penetrate the side body 110. Here, the support frame coupling part 120 may be located at a side of the side body 110 toward the support frame 200, and in the illustrated embodiment, is located near an upper end.

[0113] The support frame coupling part 120 may be formed in plurality. The plurality of support frame coupling parts 120 may be arranged at different positions to be coupled with the plurality of support frame coupling protrusions 214 formed at different positions. In the illustrated embodiment, two support frame coupling parts 120 are formed and are respectively located at the front side and the rear side end near the upper side end of the side body 110.

[0114] The number and configuration of the support frame combining portions 120 may vary according to the number and configuration of the support frame combining protrusions 214 .

[0115] A grid coupling part 130 is formed at a lower side of the coupling part 120 .

[0116] The grid joint part 130 is a part where the side body 110 is joined to the grid part 400. The grid joint part 130 is formed to penetrate in the thickness direction of the side body 110, which is the left-right direction in the illustrated embodiment. The grid joint protrusion 450 to which the grid part 400 is joined is inserted into the grid joint part 130.

[0117] The grid joint portion 130 may be any shape that can accommodate the grid joint protrusion 450. In the illustrated embodiment, the grid joint portion 130 is a space having a rectangular cross-section whose length in the up-down direction is longer than that in the front-back direction. The shape of the grid joint portion 130 may be changed according to the shape of the grid joint protrusion 450.

[0118] The grid coupling part 130 is formed to penetrate the side body 110. Here, the grid coupling part 130 may be located at a middle portion among portions of the side body 110.

[0119] The grid combining part 130 may be divided into a plurality of groups. Different grid combining protrusions 450 may be inserted and combined into the plurality of grid combining parts 130. In the illustrated embodiment, the grid combining part 130 includes a first grid combining part 131, a second grid combining part 132, and a third grid combining part 133, which are divided into three groups.

[0120] The first grid joint part 131, the second grid joint part 132 and the third grid joint part 133 may be provided in plural numbers. In the illustrated embodiment, the first grid joint part 131, the second grid joint part 132 and the third grid joint part 133 each include ten through holes spaced apart from each other in the front-rear direction.

[0121] The first grid coupling protrusion 451 is inserted and coupled in the first grid coupling part 131. The first grid coupling part 131 is located at the uppermost side of the plurality of grid coupling parts 130.

[0122] The first grid joint part 131 extends obliquely at a predetermined angle relative to the vertical direction. In the illustrated embodiment, the first grid joint part 131 extends obliquely toward the upper rear side and the lower front side.

[0123] The second grid connection part 132 is disposed below the first grid connection part 131 .

[0124] The second grid coupling protrusion 452 is inserted and coupled to the second grid coupling portion 132. The second grid coupling portion 132 is located between the first grid coupling portion 131 and the third grid coupling portion 133 in the up-down direction of the side body 110.

[0125] The second grid joint portion 132 extends obliquely at a predetermined angle relative to the vertical direction. In the illustrated embodiment, the second grid joint portion 132 extends obliquely toward the upper rear side and the lower front side.

[0126] The third grid connection portion 133 is disposed below the second grid connection portion 132 .

[0127] The third grid coupling protrusion 453 is inserted and coupled in the third grid coupling part 133. The third grid coupling part 133 is located below the second grid coupling part 132 in the up-down direction of the side body 110. In other words, the third grid coupling part 133 is located at the lowest side of the grid coupling part 130.

[0128] The third grid joint portion 133 extends obliquely at a predetermined angle relative to the vertical direction. In the illustrated embodiment, the third grid joint portion 133 extends obliquely toward the upper rear side and the lower front side.

[0129] The number, configuration and shape of the first grid combining parts 131 , the second grid combining parts 132 and the third grid combining parts 133 may be changed according to the number of the grid parts 400 , the configuration and shape of the grid combining protrusions 451 , 452 , 453 .

[0130] In the direction in which the plurality of grid coupling parts 130 are arranged side by side, in the illustrated embodiment, an arc flow channel coupling part 140 is formed on the rear side.

[0131] The arc flow channel joint part 140 is a part where the side body 110 is joined to the arc flow channel 500. The arc flow channel joint part 140 is formed to penetrate in the thickness direction of the side body 110, which is the left-right direction in the illustrated embodiment. The arc flow channel protrusion 520 to which the arc flow channel 500 is joined is inserted into the arc flow channel joint part 140.

[0132] The arc flow channel joint 140 may be any shape that can accommodate the arc flow channel protrusion 520. In the illustrated embodiment, the arc flow channel joint 140 is a space having a rectangular cross-section whose length in the up-down direction is longer than that in the front-back direction. The shape of the arc flow channel joint 140 may be changed according to the shape of the arc flow channel protrusion 520.

[0133] The arc flow channel joint portion 140 is formed to penetrate the side body 110. Here, the arc flow channel joint portion 140 may be located near one side end portion in the length direction of the side body 110, and in the illustrated embodiment, is located near the rear side end portion.

[0134] A plurality of arc flow channel joints 140 may be provided. The plurality of arc flow channel joints 140 may be spaced apart from each other and respectively combined with the plurality of arc flow channel protrusions 520. In the illustrated embodiment, two arc flow channel joints 140 are formed, spaced apart from each other along the height direction of the side body 110, i.e., the up-down direction. The number and arrangement of the arc flow channel joints 140 may be changed according to the number and arrangement of the arc flow channel protrusions 520.

[0135] A side fastening hole 150 is formed at a lower side of the grid coupling part 130 .

[0136] The side fastening hole 150 is a portion where the side body 110 is combined with the support frame 200 and the arc guide 600. The side fastening hole 150 is formed to penetrate in the thickness direction of the side body 110, which is the left-right direction in the illustrated embodiment. The side fastening member 160 is inserted and coupled in the side fastening hole 150, and the side fastening member 160 penetrates the first support fastening hole 271a of the support frame 200 and the outer fastening hole 616 of the arc guide 600.

[0137] In one embodiment, the side fastening hole 150 may be screw-fitted with the side fastening member 160. In the embodiment, a thread may be formed on the inner circumference of the side fastening hole 150.

[0138] The side fastening hole 150 may be divided into a plurality of parts. The first side fastener 161 that combines the support frame 200 and the side frame 100 may be combined with any one of the plurality of side fastening holes 150. The second side fastener 162 that combines the arc guide 600 and the side frame 100 may be combined with another one of the plurality of side fastening holes 150.

[0139] In the illustrated embodiment, the side fastening holes 150 include a first side fastening hole 151 and a second side fastening hole 152 .

[0140] The first side fastener 161 that combines the side body 110 and the support frame 200 is combined with the first side fastening hole 151. The first side fastening hole 151 may be located in a portion of the side body 110 toward a side of the support frame 200, and in the illustrated embodiment, near an upper end.

[0141] The first side fastening hole 151 may be located near the support frame coupling portion 120. In the illustrated embodiment, the first side fastening hole 151 is located between a pair of support frame coupling portions 120.

[0142] The first side fastening hole 151 may be any shape that can be penetrated and coupled with the first side fastening member 161. 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.

[0143] The second side fastener 162 that combines the side body 110 and the arc guide 600 is combined with the second side fastening hole 152. The second side fastening hole 152 is located in the portion of the side body 110 toward the other side of the arc guide 600, and in the illustrated embodiment, is located near the lower end.

[0144] The second side fastening holes 152 may be formed in plurality. The plurality of second side fastening holes 152 may be arranged at different positions to be respectively combined with the plurality of second side fasteners 162. In the illustrated embodiment, the second side fastening holes 152 are provided as a pair, respectively located near the front side end and the rear side end of the side body 110.

[0145] The number and arrangement of the second side fastening holes 152 may vary depending on the number of the external fastening holes 616 and the second side fasteners 162 of the arc guide 600 .

[0146] The side fastener 160 is used to combine the side body 110 with the support frame 200 and the arc guide 600. The side fastener 160 penetrates the side body 110 and is inserted and combined with the support frame 200 and the arc guide 600.

[0147] The side fastener 160 may be configured in any form capable of combining the side body 110 with the support frame 200 and the arc guide 600. In the illustrated embodiment, the side fastener 160 is configured as a screw member that can be threadedly combined with the side body 110, the support frame 200 and the arc guide 600, respectively.

[0148] The side fastener 160 may be provided in plural. Any one of the plural side fasteners 160 may couple the side body 110 and the support frame 200. Another one of the plural side fasteners 160 may couple the side body 110 and the arc guide 600.

[0149] In the illustrated embodiment, the side fasteners 160 include a first side fastener 161 and a second side fastener 162 .

[0150] The first side fastener 161 penetrates the first side fastening hole 151 and is coupled to the first support fastening hole 217a of the support frame 200. The first side fastener 161 couples the side body 110 and the support frame 200.

[0151] The second side fastener 162 penetrates the second side fastening hole 152 and is coupled to the outer fastening hole 616 of the arc guide 600. The second side fastener 162 couples the side body 110 and the arc guide 600.

[0152] The second side fasteners 162 may be provided in plurality. The plurality of second side fasteners 162 may be respectively combined with the plurality of second side fastening holes 152 and the plurality of external fastening holes 616. In the illustrated embodiment, the second side fasteners 162 are provided as a pair, respectively combined with the plurality of second side fastening holes 152 and the plurality of external fastening holes 616.

[0153] (2) Description of the support frame 200

[0154] The support frame 200 combines 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. The space of the support frame 200 may be provided with a member for filtering foreign matter mixed in the extinguished arc.

[0155] The support frame 200 is combined with 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 may be combined with the first side frame 100a and the second side frame 100b, respectively. In the illustrated embodiment, the left and right side portions of the support frame 200 are combined with the upper side portion of the side frame 100.

[0156] The support frame 200 is combined with the cover frame 300. The upper side portion of the support frame 200 and the space are covered by the cover frame 300. Therefore, the components accommodated in the space can be prevented from falling off randomly. The space can communicate with the outside through the cover frame 300.

[0157] exist Figures 6 to 8 In the illustrated embodiment, the support frame 200 includes a support body 210 , a support plate 220 , and a mesh plate 230 .

[0158] The support body 210 constitutes a main body of the support frame 200. The support body 210 is a portion where the support frame 200 is combined 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.

[0159] A space is formed inside the support body 210. The support plate 220 and the mesh plate 230 are arranged in the space. The grid part 400 is arranged at the lower side of the space. The upper side of the space is connected to the outer side of the cover frame 300. Therefore, the space accommodating the grid part 400 is connected to the outer side of the cover frame 300, so that the generated arc can be extinguished and discharged to the outside.

[0160] The support body 210 is combined with the side frame 100 and the cover frame 300, and the support body 210 can be any shape that can connect the internal space of the arc extinguishing device 10 with the outside. In the illustrated embodiment, the support body 210 is a square column shape having a quadrangular cross-section and a height in the up-down direction. Here, a space penetrating along the height direction, i.e., the up-down direction, is formed inside the support body 210.

[0161] In the illustrated embodiment, the support body 210 includes a board receiving portion 211 , a board supporting portion 212 , a buffer space 213 , a support frame coupling protrusion 214 , a grid supporting portion 215 , a cover frame supporting portion 216 , a support fastening hole 217 , and a holding groove 218 .

[0162] The board receiving portion 211 receives the support plate 220 and the mesh plate 230. The board receiving portion 211 constitutes a part of the space formed inside the support body 210. In the illustrated embodiment, the board receiving portion 211 constitutes an upper space in the space formed inside the support body 210.

[0163] 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 a space having a rectangular cross section having a length in the front-rear direction longer than a length in the left-right direction and formed in a square column shape having a height in the up-down direction.

[0164] The plate receiving portion 211 is open at one side, which is the upper side in the illustrated embodiment, toward the cover frame 300. The support plate 220 and the mesh plate 230 are received in the plate receiving portion 211 using the one side.

[0165] The portion of the board receiving portion 211 is open toward the other side of the grid portion 400 , which is the lower side in the illustrated embodiment. The arc generated in the grid portion 400 can travel to the board receiving portion 211 using the other side.

[0166] A board support portion 212 is disposed below the board accommodation portion 211 .

[0167] The board support part 212 supports the support plate 220 and the mesh plate 230 accommodated in the board accommodation part 211. In addition, the board support part 212 extends from the outside to surround the buffer space 213. In other words, the cross-sectional area of ​​the buffer space 213 formed by the board support part 212 is smaller than the cross-sectional area of ​​the board accommodation part 211.

[0168] 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 and do not enter the buffer space 213 at will.

[0169] 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 .

[0170] The plate support portion 212 can be divided into a plurality of parts. In the illustrated embodiment, the plate support portion 212 can be divided into a pair of parts arranged in the front-to-back direction and extending in the left-to-right direction and a pair of other parts arranged in the left-to-right direction and extending in the front-to-back direction. Here, the first support fastening holes 217a are formed through the pair of other parts of the plate support portion 212.

[0171] A space surrounded by the plate support portion 212 is defined as a buffer space 213 .

[0172] The buffer space 213 constitutes another part of the space formed inside the support body 210. In the illustrated embodiment, the buffer space 213 forms a lower side space of the inner space of the support body 210.

[0173] The buffer space 213 is located between the plate receiving portion 211 and the grid portion 400. The buffer space 213 is formed to penetrate the support frame 200 in a height direction, which is a vertical direction in the illustrated embodiment.

[0174] One side of the portion of the buffer space 213 toward the plate receiving portion 211, which is the upper side in the illustrated embodiment, is open and communicates with the plate receiving portion 211. The other side of the portion of the buffer space 213 toward the grid portion 400, which is the lower side in the illustrated embodiment, is open and communicates with the grid portion 400.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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-rear direction, has a width in the left-right direction, and has a height in the up-down direction.

[0179] Here, the support frame combined protrusion 214 can form different cross-sectional areas along its height direction. In the illustrated embodiment, the support frame combined protrusion 214 is formed such that the cross-sectional area of ​​the upper side is larger than the cross-sectional area of ​​the lower side. In other words, one side of the outer side of the support frame combined protrusion 214 extends obliquely toward the inner side of the lower side.

[0180] 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 fall off from the support frame coupling portion 120 at will without external force.

[0181] The supporting frame combining protrusions 214 may be formed in plurality. The plurality of supporting frame combining protrusions 214 may be spaced apart from each other and disposed at different positions to be combined with the plurality of supporting frame combining parts 120 respectively.

[0182] In the illustrated embodiment, a pair of support frame coupling protrusions 214 are provided on the left outer surface and the right outer surface of the support body 210, and a total of four are provided. Here, each pair of support frame coupling protrusions 214 formed on the left outer surface and the right outer surface of the support body 210 are spaced apart from each other in the front-to-back direction.

[0183] The number and configuration of the support frame coupling protrusions 214 may vary according to the number and configuration of the support frame coupling portions 120 .

[0184] The grid support portion 215 is located close to the support frame coupling protrusion 214 .

[0185] The grid support portion 215 supports the grid portion 400 in the arrangement direction of the grid portion 400, in the front-rear direction in the illustrated embodiment. The grid support portion 215 supports the grid portion 400 on one side in the extension direction of the grid portion 400, in the illustrated embodiment, the upper side.

[0186] The grid support portion 215 is provided on the support body 210. The grid support portion 215 is located on one side of the support body 210 that faces the grid portion 400, which is the lower side in the illustrated embodiment.

[0187] A plurality of grid support parts 215 may be provided. The plurality of grid support parts 215 may be located at each end in the direction in which the plurality of grid parts 400 are arranged side by side. In the illustrated embodiment, the grid support part 215 includes a first grid support part 215a located at the front side and a second grid support part 215b located at the rear side.

[0188] The first grid support portion 215a is located at the front side of the support body 210. The first grid support portion 215a forms one side in the length direction of the support body 210, and in the illustrated embodiment, forms the front side.

[0189] The first grid support portion 215a surrounds a portion of the board receiving portion 211 and the buffer space 213. In the illustrated embodiment, the first grid support portion 215a surrounds the front side of the board receiving portion 211 and the buffer space 213. In other words, the first grid support portion 215a forms the front side of the support body 210.

[0190] Here, the first grid support portion 215 a may include a rib (not given a reference numeral) extending toward the board receiving portion 211 or the buffer space 213 . The rib (not given a reference numeral) is configured to support the first grid 400 a provided in the grid portion 400 .

[0191] The first grid support portion 215 a and the second grid support portion 215 b are disposed opposite to each other with the plate receiving portion 211 and the buffer space 213 interposed therebetween.

[0192] The second grid support portion 215b is located at the rear side of the support body 210. The second grid support portion 215b forms the other side in the length direction of the support body 210, and in the illustrated embodiment, forms the rear side.

[0193] The second grid support portion 215b surrounds the board receiving portion 211 and a portion of the buffer space 213. In the illustrated embodiment, the second grid support portion 215b surrounds the rear side of the board receiving portion 211 and the buffer space 213. In other words, the second grid support portion 215b constitutes the rear side of the support body 210.

[0194] The cover frame support part 216 supports the cover frame 300 coupled to the support frame 200. By the cover frame support part 216, the cover frame 300 coupled to the support frame 200 may be prevented from shaking or falling off at will.

[0195] The cover frame support portion 216 is formed on one side of the support body 210 that faces the cover frame 300, which is the upper side in the illustrated embodiment. The cover frame support portion 216 extends in a direction in which the support body 210 extends longer, which is the front-rear direction in the illustrated embodiment. In the illustrated embodiment, the cover frame support portion 216 is formed to protrude from the upper side surface of the support body 210 toward the upper side.

[0196] The cover frame support part 216 may be provided in plural. The plural cover frame support parts 216 may be spaced apart from each other and support the cover frame 300 at different positions. In the illustrated embodiment, the cover frame support parts 216 are provided in a pair, formed on the left and right sides of the support body 210, respectively.

[0197] The pair of cover frame support parts 216 are disposed opposite to each other across the receiving part 211. The pair of cover frame support parts 216 support both sides of the cover frame 300. In the illustrated embodiment, the pair of cover frame support parts 216 support the left and right sides of the cover frame 300.

[0198] The support fastening hole 217 is a portion where the support frame 200 is coupled to other components. The side fasteners 160 and the cover fasteners 350 are coupled to the support fastening hole 217 .

[0199] The support fastening hole 217 is formed to be recessed in the support body 210 or to penetrate the support body 210. The support fastening hole 217 may be formed in any form that can be coupled with the side fastener 160 or the cover fastener 350.

[0200] The support fastening holes 217 may be provided in a plurality of groups. Any one of the plurality of groups of support fastening holes 217 may be combined with the first side fastener 161 that combines the side frame 100 and the support body 210. Another one of the plurality of groups of support fastening holes 217 may be combined with the cover fastener 350 that combines the support body 210 and the cover frame 300.

[0201] In the illustrated embodiment, the support fastening holes 217 include a first support fastening hole 217 a and a second support fastening hole 217 b .

[0202] The first support fastening hole 217a is combined with the first side fastener 161 that combines the side body 110 and the support body 210. The first support fastening hole 217a is formed to penetrate in the thickness direction of a pair of outer circumferences extending relatively longer in the outer circumference of the support body 210, and is formed to penetrate in the thickness direction of the outer circumferences of the left and right sides in the illustrated embodiment.

[0203] The first side fastener 161 is inserted and coupled in the first support fastening hole 217a. In one embodiment, the first support fastening hole 217a may be threadedly coupled to the first side fastener 161. In the embodiment, a thread may be formed on the outer circumference of the first support fastening hole 217a.

[0204] The first support fastening holes 217a may be formed in plural numbers. The plural first support fastening holes 217a may be respectively formed at plural peripheries of the support body 210. In the illustrated embodiment, the first support fastening holes 217a are provided in a pair, and are respectively formed through the left and right peripheries of the support body 210.

[0205] Here, the first support fastening hole 217a may extend to the plate support portion 212 formed inside the support body 210. Therefore, the first support fastening hole 217a may communicate the buffer space 213 with the radially outer side of the support body 210.

[0206] The second support fastening hole 217b is combined with the cover fastener 350 that combines the support body 210 and the cover frame 300. The second support fastening hole 217b is formed to penetrate or be recessed in the surface of the support body 210 toward the cover frame 300, and in the illustrated embodiment, penetrate or be recessed in the upper side surface.

[0207] The cover fastener 350 may be inserted and coupled into the second support fastening hole 217b. In one embodiment, the second support fastening hole 217b and the cover fastener 350 may be threadedly coupled. In the embodiment, a thread may be formed on the outer circumference of the second support fastening hole 217b.

[0208] The second support fastening holes 217b may be formed in plural. The plural second support fastening holes 217b may be formed at different positions on the upper surface of the support body 210. In the illustrated embodiment, four second support fastening holes 217b are provided, which are respectively located near the respective edges of the upper surface of the support body 210.

[0209] The support plate 220 partially connects the space where the grid part 400 is located with the outside of the arc extinguishing device 10. The support plate 220 supports the mesh plate 230 from the lower side.

[0210] The support plate 220 is received in the plate receiving portion 211 . Here, the outer periphery of the support plate 220 is supported by the plate supporting portion 212 so that the support plate 220 does not move to the buffer space 213 .

[0211] 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, one end portion in the extending direction thereof has a cross section formed with a protruding portion, the other end portion in the extending direction thereof has a cross section formed with a recessed portion, and the support plate 220 has a thickness in the up-down direction.

[0212] 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.

[0213] exist Figure 7 In the illustrated embodiment, the support plate 220 includes a support communication hole 221 and a plate groove 222 .

[0214] The supporting connecting hole 221 is formed to penetrate the inside of the supporting plate 220, so that the space where the grid part 400 is located is partially connected to the outside of the arc extinguishing device 10. The arc generated and extinguished in the grid part 400 can be discharged to the outside through the supporting connecting hole 221 and the mesh plate 230 in sequence.

[0215] A plurality of supporting and communicating holes 221 may be formed. The plurality of supporting and communicating holes 221 are separated from each other and may connect the space where the grid portion 400 is located with the outside at different positions. In the illustrated embodiment, the positions of the plurality of supporting and communicating holes 221 are biased toward the front side and are arranged opposite to the arc flow channel 500 located at the rear side. This is to increase the internal pressure of the generated initial arc so that the generated arc can be rapidly elongated and flow into the arc extinguishing device 10.

[0216] Specifically, the fixed contact and the movable contact are located at positions opposite to the arc flow channel 500. Here, the support communication hole 221 is not formed in the portion of the support plate 220 located above the fixed contact and the movable contact. Therefore, the support communication hole 221 is partially sealed from the fixed contact and the movable contact, so that the pressure of the generated initial arc increases rapidly.

[0217] The plate groove 222 is formed concavely at the edge of the other end portion in the extending direction of the support plate 220. The operator inserts a finger or a tool into the plate groove 222, so that the support plate 220 can be easily taken out.

[0218] The mesh plate 230 is used to filter foreign matter remaining in the extinguished and discharged arc. The mesh plate 230 can prevent the foreign matter remaining in the arc from being arbitrarily discharged to the outside of the arc extinguishing device 10. Therefore, it is possible to prevent the arc extinguishing device 10 or other components of the circuit breaker (not shown) from being damaged by the foreign matter.

[0219] The mesh plate 230 is accommodated in the plate accommodation portion 211. Here, the mesh plate 230 is arranged to cover the support plate 220 and is supported by the support plate 220.

[0220] The mesh plate 230 is received in the plate receiving portion 211 and can be provided in any form capable of filtering foreign matter remaining in the arc, etc. In the illustrated embodiment, the mesh plate 230 is formed in a square plate shape corresponding to the support plate 220 .

[0221] A plurality of mesh plates 230 may be provided. The plurality of mesh plates 230 are stacked in the thickness direction thereof, and can filter foreign matter and the like remaining in the arc passing therethrough respectively. In the illustrated embodiment, six mesh plates 230 are provided and stacked in the up-down direction. Therefore, the arc passing through the mesh plates 230 can be discharged to the outside of the arc extinguishing device 10 after being filtered multiple times.

[0222] In the illustrated embodiment, the mesh plate 230 located at the lowermost side is supported by the support plate 220 . The mesh plate 230 located at the uppermost side is covered by the cover frame 300 .

[0223] exist Figure 8 In the illustrated embodiment, the mesh plate 230 includes mesh through holes 231 and mesh ribs 232 .

[0224] The mesh through hole 231 is formed to penetrate the mesh plate 230 in the thickness direction, thereby forming a passage through which the arc can pass. The mesh through hole 231 is defined as being surrounded by the mesh ribs 232 .

[0225] The mesh hole 231 may be in any shape that allows the arc to pass through and blocks the passage of foreign matter remaining in the arc. In the illustrated embodiment, the mesh hole 231 is a square pillar-shaped space having a quadrangular cross section and a height in the vertical direction.

[0226] The mesh through hole 231 is surrounded by the mesh ribs 232. The mesh ribs 232 are provided in plural numbers and extend along the length direction and the width direction of the mesh plate 230. Here, the mesh ribs 232 extending in the same direction are spaced apart from each other to form the mesh through hole 231 therebetween.

[0227] A plurality of mesh through holes 231 and mesh ribs 232 may be formed, and the plurality of mesh through holes 231 and the plurality of mesh ribs 232 may be alternately arranged along the length direction and the width direction of the mesh plate 230 .

[0228] In addition, the plurality of mesh through holes 231 and the plurality of mesh ribs 232 respectively formed in the plurality of stacked mesh plates 230 may be alternately arranged along the stacking direction thereof, and in the illustrated embodiment, are alternately arranged along the up-and-down direction.

[0229] Therefore, the arc that has passed through the mesh holes 231 formed in any one mesh plate 230 can pass through the mesh holes 231 formed in another mesh plate 230 after traveling in the horizontal direction. Therefore, the filtering effect of foreign matter and the like remaining in the arc can be improved.

[0230] (3) Description of Cover Frame 300

[0231] The cover frame 300 covers the support frame 200 and is combined with 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 the upper side. Even if the disconnection operation generates pressure, the cover frame 300 can prevent the support plate 220 and the mesh plate 230 from falling off at will.

[0232] The cover frame 300 is combined with the support frame 200. A plurality of through holes (i.e., cover through holes 320 to be described later) are formed inside the cover frame 300 to connect the inner space of the support body 210 (i.e., the plate receiving portion 211 and the buffer space 213) with the outside. Therefore, the arc that has passed through the grid portion 400 and has been extinguished can be discharged to the outside through the support frame 200 and the cover frame 300 in sequence.

[0233] exist Figure 4 and Fig. 9 In the illustrated embodiment, the cover frame 300 includes a cover body 310 , a cover through hole 320 , a cover rib 330 , a cover fastening hole 340 , and a cover fastener 350 .

[0234] The cover body 310 constitutes a main body of the cover frame 300. The cover body 310 is formed in a shape corresponding to the support body 210 so that it can cover a space formed inside the support body 210 and be combined with the support body 210. In the illustrated embodiment, the cover body 310 is formed to have a polygonal cross-section having a length in the front-rear direction longer than a length in the left-right direction and having a thickness in the up-down direction.

[0235] A cover through hole 320 and a cover rib 330 are provided inside the cover body 310. In addition, a cover fastening hole 340 is arranged at a position close to each edge of the cover body 310.

[0236] The cover through hole 320 is formed to penetrate the inside of the cover body 310 to connect the inner 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.

[0237] The cover through hole 320 is formed to penetrate in the thickness direction of the cover body 310, and is formed to penetrate in the up-down direction in the illustrated embodiment. One end of the cover through hole 320 in the penetration direction, which is the upper side in the illustrated embodiment, is open and communicated with the outside. The other end of the cover through hole 320 in the penetration direction, which is the lower side in the illustrated embodiment, is open and communicated with the internal space of the support body 210.

[0238] The cover through hole 320 is surrounded by the cover rib 330. The cover rib 330 extends in the length direction and the width direction of the cover body 310, and in the illustrated embodiment, extends in the front-rear direction and the left-right direction, and surrounds the cover through hole 320 in the horizontal direction.

[0239] The cover through hole 320 may be any shape that can communicate the inner space of the support body 210 with the outside of the arc extinguishing device 10. In the illustrated embodiment, the cover through hole 320 is formed as a square plate-like space having a quadrangular cross section and a thickness in the up-and-down direction.

[0240] The cover through holes 320 and the cover ribs 330 may be provided in plural numbers, respectively. The plural cover through holes 320 and the plural cover ribs 330 may be alternately arranged with each other along the length direction and the width direction of the cover body 310 .

[0241] In the illustrated embodiment, three cover through holes 320 are formed in the front-rear direction and three in the left-right direction, forming a total of nine. The cover rib 330 may extend between the cover through holes 320 disposed close to each other.

[0242] The cover fastening hole 340 is a portion for fastening the cover frame 300 to other components of the circuit breaker (not shown) and the support frame 200. The cover fastening hole 340 is formed to penetrate the cover body 310 in the thickness direction, and penetrate in the vertical direction in the illustrated embodiment.

[0243] The cover fastening holes 340 may be formed in a plurality. The plurality of cover fastening holes 340 are formed at different positions from each other so that a plurality of fasteners can penetrate the cover body 310. In one embodiment, the cover fastening holes 340 may be threadedly coupled with the fasteners. In the embodiment, the inner circumference of the cover fastening holes 340 may be threaded.

[0244] In the illustrated embodiment, the cover fastening holes 340 include a first cover fastening hole 341 and a second cover fastening hole 342 .

[0245] The first cover fastening hole 341 is connected to a fastener that connects the arc extinguishing device 10 and the circuit breaker (not shown). The first cover fastening hole 341 is formed to penetrate the cover body 310 in the thickness direction, and penetrate in the vertical direction in the illustrated embodiment.

[0246] The first cover fastening holes 341 may be formed in plural. The plural first cover fastening holes 341 may be formed at different positions. In the illustrated embodiment, two first cover fastening holes 341 are formed and are located near each end in the length direction of the cover body 310, that is, near the front side end and the rear side end, respectively.

[0247] The second cover fastening hole 342 is coupled to a cover fastener 350 coupling the cover frame 300 and the support frame 200. The second cover fastening hole 342 is formed to penetrate in the thickness direction of the cover body 310, and in the up-down direction in the illustrated embodiment.

[0248] The second cover fastening holes 342 may be formed in plural. The plural second cover fastening holes 342 may be formed at different positions from each other. In the illustrated embodiment, four second cover fastening holes 342 are formed and located near the respective edges of the cover body 310 .

[0249] The cover fastener 350 combines the cover frame 300 and the support frame 200. The cover fastener 350 is penetrated and coupled to the cover fastening hole 340.

[0250] The cover fastener 350 may be provided in any form capable of combining the cover frame 300 and the support frame 200. In one embodiment, the cover fastener 350 may be provided as a screw member having threads formed on an outer circumference thereof.

[0251] The cover fastener 350 may be provided in plural numbers, and the plural cover fasteners 350 may respectively couple the cover frame 300 and the support frame 200 .

[0252] In the illustrated embodiment, four cover fasteners 350 are provided, each of which is combined with four second cover fastening holes 342 and four second support fastening holes 217 b.

[0253] (4) Description of Grid Section 400

[0254] The grid portion 400 extinguishes the arc formed when the fixed contact and the movable contact are separated when the current is energized. The generated arc is cooled, elongated, moved, and split along the grid portion 400, and discharged to the outside of the arc extinguishing device 10. Therefore, it can be said that the grid portion 400 substantially performs the function of extinguishing the arc.

[0255] The grid portion 400 is coupled to the side frame 100. Each end portion of the grid portion 400 in the width direction is supported by a pair of side frames 100a and 100b.

[0256] A portion of the grid portion 400 is received in the support frame 200 . In the illustrated embodiment, a portion of the upper side of the grid portion 400 is received in the buffer space 213 of the support frame 200 .

[0257] The grid part 400 is combined with the arc guide 600. With the arc guide 600, the generated arc can obtain sufficient energy so that the space formed between the plurality of grid parts 400 is elongated, divided, and extinguished.

[0258] A plurality of grid parts 400 may be provided. The plurality of grid parts 400 may be arranged side by side and spaced apart from each other along the moving direction of the movable contact, and in the illustrated embodiment, are arranged side by side and spaced apart from each other along the front-rear direction. The generated arc may pass through the spaces formed between the plurality of grid parts 400, respectively, so as to be divided, cooled, and extinguished.

[0259] The grid portion 400 may be divided into a plurality of grid portions according to their shapes. The plurality of grid portions 400 may be arranged to be spaced apart from each other along the aforementioned direction, ie, along the front-rear direction.

[0260] exist Figures 10 to 12 In the illustrated embodiment, the grid portion 400 includes three grids, namely a first grid 400a, a second grid 400b, and a third grid 400c.

[0261] The first grid 400a is located at one end in the direction in which the plurality of grid parts 400 are arranged side by side, and in the illustrated embodiment, is located at the front end. The first grid 400a is arranged closest to the fixed contact.

[0262] The second grid 400b and the third grid 400c are located behind the first grid 400b. Here, the second grid 400b and the third grid 400c are alternately arranged along the direction in which the plurality of grid parts 400 are arranged side by side, and in the illustrated embodiment, they are alternately arranged from the front side to the rear side.

[0263] That is, one first grid 400a is provided, and a plurality of second grids 400b and a plurality of third grids 400c are provided, and they are alternately arranged along the arrangement direction thereof.

[0264] The practical benefit brought about by the difference between the first grid 400a, the second grid 400b and the third grid 400c lies in the difference in the shape of the grid arms 420 which will be described later.

[0265] That is, Fig.12 As shown, the grid arms 420 of the first grid 400a are formed to be smaller than the grid arms 420 of the second grid 400b and the third grid 400c. Specifically, the width (i.e., the length in the left-right direction) and the extended length (i.e., the length in the up-down direction) of the grid arms 420 of the first grid 400a are formed to be shorter than those of the second grid 400b and the third grid 400c.

[0266] Therefore, a sufficient space can be secured for the movement of the movable contact and the movable contact holder MR, and a sufficient space can be secured for the coupling of the arc guide 600 .

[0267] The first grid 400a, the second grid 400b and the third grid 400c differ only in the shape of the grid arm 420, and have the same other structures and functions. Therefore, in the following description, the same description is collectively referred to as the grid part 400.

[0268] exist Figures 10 to 12 In the illustrated embodiment, the grid portion 400 includes a grid body 410 , grid arms 420 , arc inducing spaces 430 , arc extending spaces 440 , and grid combining protrusions 450 .

[0269] The grid body 410 constitutes a main body of the grid portion 400. The grid body 410 actually performs the functions of dividing, cooling, and thus extinguishing the arc.

[0270] The grid body 410 may be provided in a plate shape. In the illustrated embodiment, the grid body 410 is provided in a square plate shape having a length in the left-right direction longer than a length in the up-down direction.

[0271] The grid body 410 is continuous with the grid arms 420. In the illustrated embodiment, the lower side of the grid body 410 is continuous with the upper side of the grid arms 420.

[0272] The grid body 410 surrounds a portion of the arc induction space 430 and the arc extension space 440. Specifically, in the illustrated embodiment, the grid body 410 of the first grid 400a surrounds the upper side of the arc extension space 440. The grid bodies 410 of the second grid 400b and the third grid 400c surround the upper sides of the arc induction space 430 and the arc extension space 440.

[0273] A first grid coupling protrusion 451 of the grid coupling protrusion 450 and a second grid protrusion 452 are provided at each end portion of the grid body 410 in the width direction.

[0274] 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.

[0275] 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.

[0276] The grid arm 420 may be formed in plurality. The plurality of grid arms 420 may be spaced apart from each other and may be respectively combined with the grid body 410 at other positions. In the illustrated embodiment, a pair of grid arms 420 are provided, including a first grid arm 421 located on the left and a second grid arm 422 located on the right.

[0277] The first grid arm 421 and the second grid arm 422 are arranged to be spaced apart in the width direction of the grid body 410, that is, in the left-right direction. In other words, the first grid arm 421 and the second grid arm 422 are arranged to face each other with the arc induction space 430 or the arc extension space 440 interposed therebetween.

[0278] As described above, the pair of grid arms 420 provided at the first grid 400 a is formed to have a shorter width and an extended length than the pair of grid arms 420 provided at the second grid 400 b and the third grid 400 c .

[0279] The pair of grid arms 420 provided in the first grid 400a are arranged to face each other with the arc extension space 440 interposed therebetween. The pair of grid arms 420 provided in the second grid 400b and the third grid 400c are arranged to face each other with the arc induction space 430 and the arc extension space 440 interposed therebetween.

[0280] A third grid coupling protrusion 453 of the grid coupling protrusion 450 is formed at an outer edge of the grid arm 420 .

[0281] The arc induction space 430 induces an arc generated when the fixed contact and the movable contact are separated to the grid bodies 410 or a space between the grid bodies 410 .

[0282] 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.

[0283] Reference Fig.12The arc induction space 430 is formed in the second grid 400b and the third grid 400c. The arc induction space 430 is recessed in the edge of the grid body 410 on the side opposite to the support frame 200 or the cover frame 300, and in the illustrated embodiment, is recessed in the lower side edge.

[0284] Here, the arc induction spaces 430 formed at the second grid 400 b and the third grid 400 c may be formed at different positions from each other.

[0285] That is, Fig.12 As shown, the first arc induction space 431 formed in the second grid 400b is located at a position biased toward the first grid arm 421. In other words, the first arc induction space 431 formed in the second grid 400b is located at a position biased toward the left side.

[0286] In addition, the second arc induction space 432 formed in the third grid 400c is located at a position biased toward the second grid arm 422. In other words, the second arc induction space 432 formed in the third grid 400c is located at a position biased toward the right side.

[0287] Therefore, the generated arc may be alternately induced in the width direction of the grid part 400 and induced to the grid bodies 410 or the space between the grid bodies 410. Therefore, the process of extinguishing the generated arc may be effectively performed.

[0288] The arc extension space 440 is a space where the movable contact holder MR moves. The arc generated between the movable contact and the fixed contact may be elongated along the moving movable contact holder MR and induced to the grid body 410 or the space between the grid bodies 410 .

[0289] A portion of arc extension space 440 is surrounded by grid body 410 and grid arms 420. In the illustrated embodiment, arc extension space 440 is surrounded by grid body 410 at its upper side and grid arms 420 at its left and right sides in its width direction.

[0290] The arc extension space 440 communicates with the arc induction space 430. The arc extending from the arc extension space 440 may be induced to the grid bodies 410 or the space between the grid bodies 410 using the arc induction space 430.

[0291] The grid coupling protrusion 450 is a portion where the grid part 400 is coupled to the side frame 100. The grid coupling protrusion 450 is inserted and coupled to the grid coupling part 130 formed in the side frame 100.

[0292] The grid coupling protrusion 450 is continuous with the grid body 410 and the grid arm 420. The grid coupling protrusion 450 protrudes outward from each end portion in the width direction of the grid body 410 and the grid arm 420, and in the illustrated embodiment, protrudes outward from the left and right edges.

[0293] There may be a plurality of grid combining protrusions 450. The plurality of grid combining protrusions 450 may be respectively combined with the plurality of grid combining parts 130. In the illustrated embodiment, there are three grid combining protrusions 450, including a first grid combining protrusion 451, a second grid combining protrusion 452, and a third grid combining protrusion 453.

[0294] The first grid coupling protrusion 451 is inserted and coupled to the first grid coupling portion 131. The first grid coupling protrusion 451 is located at the uppermost side of the plurality of grid coupling protrusions 450. The first grid coupling protrusion 451 protrudes outward from both side edges of the grid body 410.

[0295] The second grid coupling protrusion 452 is inserted and coupled to the second grid coupling portion 132. The second grid coupling protrusion 452 is located at the middle side of the plurality of grid coupling protrusions 450. The second grid coupling protrusion 452 protrudes outward from both side edges of the upper side of the grid arm 420.

[0296] The third grid coupling protrusion 453 is inserted and coupled to the third grid coupling portion 133. The third grid coupling protrusion 453 is located at the lowermost side of the plurality of grid coupling protrusions 450. The third grid coupling protrusion 453 protrudes outward from both side edges of the lower side of the grid arm 420.

[0297] The number, shape, and arrangement of the grid combining protrusions 450 may vary according to the number, shape, and arrangement of the grid combining parts 130 .

[0298] (5) Description of the arc flow channel 500

[0299] The arc flow channel 500 can induce the arc generated by the separation of the fixed contact and the movable contact to the arc induction space 430. The arc flow channel 500 is located at the downstream side of the generated arc, that is, the position farthest from the fixed contact. In the illustrated embodiment, the arc flow channel 500 is located at the rear side of the arc extinguishing device 10, and is located near the rearmost grid portion 400 among the plurality of grid portions 400.

[0300] The arc flow channel 500 is coupled to the side frame 100. Both sides of the arc flow channel 500 in the width direction are supported by a pair of side frames 100a and 100b.

[0301] exist Fig.13In the illustrated embodiment, the arc runner 500 includes an arc runner body 510 , an arc runner protrusion 520 , and an arc inducing member 530 .

[0302] The arc flow channel body 510 constitutes a main body of the arc flow channel 500. The arc flow channel body 510 is continuous with other components of the arc flow channel 500. The arc flow channel body 510 partially overlaps with the grid portion 400 located at the rearmost side among the plurality of grid portions 400.

[0303] The arc flow channel body 510 is continuous with other components of the arc flow channel 500 and may be any shape capable of inducing an arc. In the illustrated embodiment, the arc flow channel body 510 is configured as a square plate having a length in the left-right direction longer than in the up-down direction.

[0304] The arc flow channel body 510 has arc flow channel protrusions 520 formed at each end in the length direction, ie, the left end and the right end.

[0305] The arc flow channel protrusion 520 is inserted into the arc flow channel coupling portion 140 coupled to the side frame 100. Through the coupling manner, the arc flow channel 500 can be coupled to the side frame 100 and supported by the side frame 100.

[0306] The arc runner protrusion 520 is continuous with the arc runner body 510. The arc runner protrusion 520 protrudes outward from each end portion in the length direction of the arc runner body 510, and in the illustrated embodiment, protrudes outward from the left end portion and the right end portion.

[0307] A plurality of arc flow path protrusions 520 may be provided. The plurality of arc flow path protrusions 520 may be continuous with the arc flow path body 510 at different positions from each other. In addition, the plurality of arc flow path protrusions 520 may be respectively combined with the plurality of arc flow path combining parts 140 .

[0308] In the embodiment shown, a pair of arc channel protrusions 520 are provided on the left side and a pair on the right side, forming a total of four. Here, each pair of arc channel protrusions 520 is spaced apart in the height direction of the arc channel body 510, and in the embodiment shown, is spaced apart in the vertical direction.

[0309] The number and arrangement of the arc flow path protrusions 520 may be changed according to the number and arrangement of the arc flow path combining portions 140 .

[0310] 3. Description of the Arc Guide 600 of the Embodiment of the Present Invention

[0311] Refer again Figures 1 to 4 The arc extinguishing device 10 according to the embodiment of the present invention includes an arc guide 600 .

[0312] When a circuit breaker (not shown) is connected to a small current, the arc generated by the separation of the fixed contact and the movable contact has less energy than that of a large current. Therefore, for the arc generated when a small current is connected, energy must be provided to help the arc move and lengthen.

[0313] Therefore, the arc guide 600 of the embodiment of the present invention is configured to provide energy to the generated arc to help the arc to extend and move. In addition, the arc guide 600 can prevent the grid part 400 from being damaged by the generated arc, and can extend, cool, split and extinguish the induced arc along the plurality of grid parts 400.

[0314] The arc guide 600 is combined with the side frame 100. Specifically, the second side fasteners 162 penetrate the second side fastening holes 152 and the outer fastening holes 616 of the arc guide 600, respectively, thereby combining the arc guide 600 with the side frame 100.

[0315] Arc guide 600 is combined with grid part 400. Specifically, grid arm 420 is inserted into arc guide 620 combined inside arc guide 600. Therefore, grid arm 420 is prevented from being damaged by the arc, and the induced arc flows along grid body 410 and is effectively extinguished.

[0316] 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. Figures 14 to 16 In the illustrated embodiment, two arc guides 600 are provided, including a first arc guide 600 a located on the left and a second arc guide 600 b located on the right.

[0317] 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.

[0318] The first arc guide 600a and the second arc guide 600b may be formed symmetrically with respect to the vertical direction. Although the first arc guide 600a and the second arc guide 600b have some differences in configuration position and directionality, their structures and functions are the same. Therefore, in the following description, the first arc guide 600a and the second arc guide 600b are collectively referred to as arc guides 600.

[0319] The arc guide 600 may be divided into a plurality of structures. A portion of the plurality of structures constituting the arc guide 600 may provide energy to the generated arc. Another portion of the plurality of structures constituting the arc guide 600 may protect the plurality of grid parts 400 and maintain the insulation state between the plurality of grid parts 400.

[0320] exist Figures 14 to 16 In the illustrated embodiment, an outer arc guide 610 and an inner arc guide 620 are included.

[0321] The outer arc runner 610 constitutes a structure of the arc runner 600. The outer arc runner 610 surrounds the inner arc runner 620 from the outside and is coupled to the inner arc runner 620. That is, the outer arc runner 610 is a portion of the arc runner 600 exposed to the outside.

[0322] The external arc guide 610 provides energy to help the arc move and elongate. Specifically, the external arc guide 610 is made of a material that can generate gas using the heat of the generated arc. The gas generated by the external arc guide 610 forms pressure, providing a transfer force for the generated arc to move toward the grid portion 400.

[0323] The external arc guide 610 may be formed of any material that can generate gas using heat or pressure. In one embodiment, the external arc guide 610 may be formed of any gas generating material such as nylon, melamine, PA46 (Polyamide46), PA66 (Polyamide 66), polyamide resin (Polyamide, PA), methyl methacrylate (MethylMethacrylate, MMA), polyoxymethylene resin (Polyoxymethylene, POM) or polybutyleneterephthalate (Polybutyleneterephthalate, PBT).

[0324] A portion of each side of the outer arc guide 610 may be open. In the illustrated embodiment, the upper side of the outer arc guide 610 is open as a passage for receiving the inner arc guide 620. In addition, the outer side of the outer arc guide 610 is open and is configured to be covered by the side frame 100.

[0325] In the illustrated embodiment, the outer arc guide 610 includes a first outer face 611 , a second outer face 612 , a third outer face 613 , a fourth outer face 614 , an outer space 615 , and an outer fastening hole 616 .

[0326] The first outer surface 611 constitutes one side of the outer arc guide 610. In the illustrated embodiment, the first outer surface 611 constitutes the rear side of the outer arc guide 610. The first outer surface 611 extends obliquely relative to the vertical direction. The first outer surface 611 surrounds the outer space 615 from the rear side. The first outer surface 611 supports the inner arc guide 620 accommodated in the outer space 615 from the rear side.

[0327] The second outer surface 612 constitutes another surface of the outer arc guide 610. In the illustrated embodiment, the second outer surface 612 constitutes the lower side of the outer arc guide 610. The second outer surface 612 supports the inner arc guide 620 received in the outer space 615 from the lower side. The second outer surface 612 surrounds the outer space 615 from the lower side.

[0328] The second outer surface 612 extends at a predetermined angle to the first outer surface 611. In one embodiment, the second outer surface 612 may extend horizontally. The second outer surface 612 may extend along the length direction of the outer arc guide 610, and in the embodiment shown, along the front-to-back direction.

[0329] In one embodiment, the second outer surface 612 extends to a length sufficient to accommodate a plurality of grid portions 400 .

[0330] The third outer surface 613 constitutes another surface of the outer arc guide 610. In the illustrated embodiment, the third outer surface 613 constitutes the front side of the outer arc guide 610. The third outer surface 613 surrounds the outer space 615 from the front side. The third outer surface 613 supports the inner arc guide 620 accommodated in the outer space 615 from the front side.

[0331] The third outer surface 613 extends at a predetermined angle to the second outer surface 612. In one embodiment, the third outer surface 613 may extend vertically.

[0332] The fourth outer surface 614 constitutes another further surface of the outer arc runner 610. In the illustrated embodiment, the fourth outer surface 614 constitutes an inner side surface of the outer arc runner 610. The fourth outer surface 614 surrounds an outer space 615. The fourth outer surface 614 supports the inner arc runner 620 received in the outer space 615.

[0333] Therefore, the inner arc guide 620 accommodated in the outer space 615 is surrounded by the fourth outer surface 614 on the inner side and the side frame 100 on the outer side.

[0334] The fourth outer surface 614 is respectively continuous with the first outer surface 611, the second outer surface 612 and the third outer surface 613. In one embodiment, the fourth outer surface 614 may be vertically continuous with respect to the first outer surface 611, the second outer surface 612 and the third outer surface 613.

[0335] The external space 615 is a space defined and surrounded by the first external surface 611 , the second external surface 612 , the third external surface 613 , and the fourth external surface 614 . The external space 615 accommodates the internal arc guide 620 .

[0336] A portion of each side of the external space 615 may be open. In the illustrated embodiment, the upper side and the side (ie, the outer side) of the external space 615 toward the side frame 100 are open.

[0337] The outer space 615 may be physically separated from the space where the arc is generated. That is, the outer space 615 and the inner arc guide 620 accommodated in the outer space 615 are physically separated by the first outer surface 611 , the second outer surface 612 , the third outer surface 613 , the fourth outer surface 614 and the side frame 100 .

[0338] Therefore, the generated arc can be prevented from entering the external space 615 or directly conducted to the internal arc guide 620 accommodated in the external space 615 .

[0339] The outer fastening holes 616 are combined with the second side fasteners 162 that combine the outer arc guide 610 and the side frame 100. The outer fastening holes 616 are recessed in each side of the outer arc guide 610 toward one side of the side frame 100, and in the illustrated embodiment, are recessed at the outer edge.

[0340] In one embodiment, the external fastening hole 616 may be threadedly coupled to the second side fastener 162. In the embodiment, the outer circumference of the external fastening hole 616 may be threaded.

[0341] A plurality of external fastening holes 616 may be formed. The plurality of external fastening holes 616 may be located near each end in the extension direction of the external arc guide 610. In the illustrated embodiment, the external fastening holes 616 are provided in a pair, and are located near the first external surface 611 and the third external surface 613, respectively.

[0342] The inner arc guide 620 constitutes another component of the arc guide 600. The inner arc guide 620 is accommodated in the outer arc guide 610 so that the inner arc guide 620 is not exposed to the outside at will. Therefore, the inner arc guide 620 can be prevented from being damaged by the generated arc.

[0343] The inner arc guide 620 may be formed of an insulating material or an arc resistance material. This is to allow the arc induced into the arc induction space 430 to move along the grid body 410 to the nearby grid portion 400 .

[0344] Specifically, the arc tends to move toward a peak. Therefore, if the internal arc guide 620 is not provided or the internal arc guide 620 is formed of an arc-friendly material, the arc may move to other grid parts 400 through the grid arms 420 formed at a peak compared to the grid body 410 .

[0345] In this case, there is a risk that the arc cooling and segmentation effects are reduced compared to the case where the arc travels to other grid parts 400 using the grid body 410. Therefore, an internal arc guide 620 formed of an arc-resistant material is provided so that the arc induced to the grid arm 420 can be minimized. Therefore, the arc can travel to other grid parts 400 using the grid body 410, so that the arc cooling, segmentation and extinguishing effects can be maximized.

[0346] The internal arc guide 620 may be formed of any material that is resistant to arcing. In one embodiment, the internal arc guide 620 may be formed of a BMC (Bulk Molding Compound) material.

[0347] In the illustrated embodiment, the inner arc guide 620 includes a first inner face 621 , a second inner face 622 , a third inner face 623 , a grid receptacle 624 , and guide ribs 625 .

[0348] The first inner surface 621 constitutes one side of the inner arc guide 620. In the illustrated embodiment, the first inner surface 621 constitutes the rear side of the inner arc guide 620. The first inner surface 621 extends obliquely relative to the vertical direction. The first inner surface 621 may be formed to correspond to the shape of the first outer surface 611 and the outer fastening hole 616 formed near the first outer surface 611. The first inner surface 621 is supported by the first outer surface 611.

[0349] The second inner surface 622 constitutes another surface of the internal arc guide 620. In the embodiment shown, the second inner surface 622 constitutes the lower side of the internal arc guide 620. The second inner surface 622 forms a predetermined angle with the first inner surface 621 and is continuous. In one embodiment, the second inner surface 622 can extend horizontally. The second inner surface 622 extends along the length direction of the internal arc guide 620, and in the embodiment shown, extends along the front-to-back direction.

[0350] The second inner surface 622 is supported by the second outer surface 612. The second inner surface 622 may be formed to correspond to the shape of the second outer surface 612. In one embodiment, the second inner surface 622 may extend for a length greater than the length of the plurality of grid portions 400 arranged side by side.

[0351] The third interior face 623 can constitute another face of the inner arc guide 620. In the illustrated embodiment, the third interior face 623 constitutes a front side of the inner arc guide 620. In an embodiment, the third interior face 623 can extend vertically.

[0352] The third inner face 623 may be formed to correspond to the shape of the third outer face 613 and the outer fastening hole 616 formed adjacent to the third outer face 613. The third inner face 623 is supported by the third outer face 613.

[0353] The grid receiving portion 624 is a space for receiving the grid arm 420 of the grid portion 400. The grid receiving portion 624 is formed concavely on one side of the inner arc guide 620 facing the grid portion 400, and in the illustrated embodiment, is formed concavely on the upper side.

[0354] The grid receiving portion 624 may extend obliquely relative to the vertical direction. In the illustrated embodiment, the grid receiving portion 624 extends obliquely toward the lower side in the front and the upper side in the rear. The extending direction of the grid receiving portion 624 may be changed according to the extending angle of the grid arm 420.

[0355] The grille receiving portion 624 may be open on one side toward the grille portion 400 and on the other side toward the side frame 100. In the illustrated embodiment, the grille receiving portion 624 is open on the upper side and toward the outer side of the side frame 100.

[0356] A plurality of grid receiving parts 624 may be formed. The plurality of grid receiving parts 624 are spaced apart from each other along the direction in which the internal arc guide 620 extends, and in the illustrated embodiment, are spaced apart from each other along the front-rear direction. In the illustrated embodiment, a total of ten grid receiving parts 624 are formed, and are spaced apart from each other. The number and arrangement of the grid receiving parts 624 may be changed according to the number and arrangement of the grid parts 400.

[0357] The grid receiving portion 624 may be divided into a plurality of parts. In the illustrated embodiment, the grid receiving portion 624 includes a first grid receiving portion 624a located at the front side and a plurality of second grid receiving portions 624b located at the rear side of the first grid receiving portion 624a.

[0358] The first grid receiving portion 624a receives the grid arm 420 of the first grid 400a, and the second grid receiving portion 624b receives the grid arms 420 of the second grid 400b and the third grid 400c.

[0359] Guide ribs 625 are arranged between the plurality of grid housing portions 624 .

[0360] The guide ribs 625 are formed between the plurality of grid receiving portions 624 to physically separate the grid receiving portions 624 that are disposed close to each other. Therefore, it is possible to prevent the plurality of grid portions 400 received in each grid receiving portion 624 from directly contacting each other.

[0361] The guide rib 625 may be formed to correspond to the shape of the grid receiving portion 624 or the grid arm 420. In the illustrated embodiment, the guide rib 625 extends obliquely toward the lower side of the front and the upper side of the rear.

[0362] The plurality of grid receiving portions 624 and the plurality of guide ribs 625 are alternately arranged along the extending direction of the inner arc guide 620 , and in the illustrated embodiment, are alternately arranged along the front-to-rear direction.

[0363] In the illustrated embodiment, the first arc guide 600a and the second arc guide 600b are respectively provided with an outer arc guide 610 formed of a gas generating material and an inner arc guide 620 formed of an arc resistant material. Therefore, it can be understood that the arc guide 600 including the first arc guide 600a and the second arc guide 600b is respectively configured with a pair of outer arc guides 610 and a pair of inner arc guides 620.

[0364] As an alternative, an additional structure formed of a gas generating material or an arc-resistant material may be disposed between the outer arc guide 610 and the inner arc guide 620 .

[0365] 4. Description of the operation process of the arc extinguishing device 10 according to the embodiment of the present invention

[0366] The arc extinguishing device 10 of the embodiment of the present invention can provide energy for the generated arc. With the energy, the arc can be elongated, moved and extinguished toward the grid portion 400. Therefore, even if a small current is passed through the arc extinguishing device 10 of the embodiment of the present invention, resulting in a low energy of the arc itself, the generated arc can be effectively extinguished.

[0367] Furthermore, the arc extinguishing device 10 can prevent the generated arc from traveling to the grid arms 420 of the grid parts 400. Therefore, the generated arc can move toward other grid parts 400 along the grid bodies 410 of the grid parts 400. Therefore, the arc can be quickly cooled, split, and extinguished.

[0368] Below, refer to Figures 17 to 19 , a process of extinguishing the arc generated in the arc extinguishing device 10 of an embodiment of the present invention is described in detail.

[0369] Reference Fig.17 , showing a state where an arc extinguishing device 10 according to an embodiment of the present invention is provided.

[0370] In this state, the contact point C is located between the pair of grid arms 420 and the pair of arc guides 600 coupled to the pair of grid arms 420. On the upper side of the contact point C, the arc flow channel 500 and the grid portion 400 are arranged.

[0371] Reference Fig.18 , exemplarily showing a path Arc of an arc extending along the contact C of the movable contact holder MR and advancing toward the plurality of grid portions 400 .

[0372] As the movable contact holder MR and the contact C disposed therein separate from the fixed contact holder FR and the contact C disposed therein, an arc is generated and elongated between the contacts C. The elongated arc is divided into the space formed between the plurality of grid portions 400, travels, and is extinguished.

[0373] Here, the external arc guide 610 coupled to the grid arm 420 generates gas using heat generated by the arc. The pressure generated by the generated gas provides a transfer force for the arc to move to the space formed between the plurality of grid parts 400 .

[0374] Therefore, even in the case where an arc generated by a small current does not have sufficient energy, the arc is quickly extinguished through the grid portion 400 and discharged to the outside.

[0375] Reference Fig.19 , which exemplarily shows the process in which the generated arc travels on one grid portion 400 .

[0376] As described above, the arc has a tendency to travel toward the tip. Here, the grid arm 420 corresponding to the tip of the grid portion 400 is combined with the arc guide 600 to prevent the generated arc from traveling. In addition, the internal arc guide 620 combined with the grid arm 420 is formed of an arc-resistant material, thereby preventing the arc from traveling or being damaged by the arc.

[0377] Therefore, the arc entering the grid portion 400 travels along the grid body 410 but does not travel toward the grid arm 420. The arc traveling along the grid body 410 moves to the grid body 410 of the adjacent grid portion 400 to be cooled, split, and extinguished.

[0378] Although the embodiments of the present invention have been described, the technical concept of the present invention is not limited to the embodiments described in this specification. Those skilled in the art who understand the technical concept 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.

[0379] 10: Arc extinguishing device 100: Side frame

[0380] 100a: first side frame 100b: second side frame

[0381] 110: side body 120: support frame joint

[0382] 130: grid joint part 131: first grid joint part

[0383] 132: second grid joint part 133: third grid joint part

[0384] 140: arc flow channel joint 150: side fastening hole

[0385] 151: First side fastening hole 152: Second side fastening hole

[0386] 160: Side fastener 161: First side fastener

[0387] 162: Second side fastener 200: Support frame

[0388] 210: Support body 211: Plate storage part

[0389] 212: Plate support 213: Buffer space

[0390] 214: Support frame combined protrusion 215: Grid support part

[0391] 215a: first grid support portion 215b: second grid support portion

[0392] 216: Cover frame support portion 217: Support fastening hole

[0393] 217a: first support fastening hole 217b: second support fastening hole

[0394] 220: Support plate 221: Support communication hole

[0395] 222: Plate slot 230: Screen plate

[0396] 231: Net through hole 232: Net rib

[0397] 300: Cover frame 310: Cover body

[0398] 320: cover through hole 330: cover rib

[0399] 340: Cover fastening hole 341: First cover fastening hole

[0400] 342: Second cover fastening hole 350: Cover fastener

[0401] 400: grid portion 400a: first grid

[0402] 400b: second grid 400c: third grid

[0403] 410: Grid body 420: Grid arm

[0404] 421: first grid arm 422: second grid arm

[0405] 430: arc induction space 431: first arc induction space

[0406] 432: Second arc induction space 440: Arc extension space

[0407] 450: grid combination protrusion 451: first grid combination protrusion

[0408] 452: Second grid combination protrusion 453: Third grid combination protrusion

[0409] 500: arc flow channel 510: arc flow channel body

[0410] 520: Arc flow channel protrusion 530: Arc induction component

[0411] 600: Arc guide 600a: First arc guide

[0412] 600b: Second arc guide 610: External arc guide

[0413] 611: first outer surface 612: second outer surface

[0414] 613: third outer surface 614: fourth outer surface

[0415] 615: External space 616: External fastening hole

[0416] 620: internal arc guide 621: first internal surface

[0417] 622: Second inner surface 623: Third inner surface

[0418] 624: grid storage part 624a: first grid storage part

[0419] 624b: Second grid receiving portion 625: Guide rib

[0420] FR: Fixed contact seat MR: Movable contact seat

[0421] C: Contact Arc: The path of the arc

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 by separation of the fixed contact and the movable contact; as well as an arc guide, coupled to the grid portion, reacting with the generated arc to generate gas; The grid portion comprises: A grid body, forming a main body of the grid portion, and arranged to be separated from the fixed contact and the movable contact; a grid arm continuous with the grid body and extending toward the fixed contact and the movable contact; and an arc extension space formed so that a portion thereof is surrounded by the grid body and the grid arm, and the movable contact is movably accommodated in the arc extension space; The arc guide is coupled to a portion of the grid arm surrounding the arc extension space to generate gas using heat of the generated arc.

2. The arc extinguishing device according to claim 1, wherein: The grid body extends in a different direction than the grid arms; The grid arm comprises: A first grid arm, located on one side biased toward the extension direction of the grid body; and The second grid arm is located on the other side of the extension direction of the grid body, and the second grid arm is arranged opposite to the first grid arm with the arc extension space interposed therebetween.

3. The arc extinguishing device according to claim 2, wherein: The arc guide comprises: a first arc guide coupled to the first grid arm; and The second arc guide is coupled to the second grid arm, and the second arc guide is disposed opposite to the first arc guide with the arc extending space interposed therebetween.

4. The arc extinguishing device according to claim 1, wherein: The arc guide comprises: an internal arc guide coupled to the grid arm; and The external arc guide accommodates the internal arc guide and is exposed in the arc extension space.

5. The arc extinguishing device according to claim 4, wherein: The outer arc guide is formed of a material that generates gas using heat of the generated arc.

6. The arc extinguishing device according to claim 5, wherein: The external arc guide is formed of any one or more materials selected from the group consisting of nylon, melamine, PA46, PA66, polyamide resin, methyl methacrylate, polyoxymethylene resin, and polybutylene terephthalate.

7. The arc extinguishing device according to claim 4, wherein: The inner arc guide is formed of an arc resistant material.

8. The arc extinguishing device according to claim 7, wherein: The inner arc guide is formed from a bulk molding compound material.

9. The arc extinguishing device according to claim 4, wherein: The internal arc guide comprises: a grid receiving portion formed by being recessed from a side of the internal arc guide member facing the grid portion to receive the grid arm; and The guide rib surrounds a portion of the grid receiving portion and extends to support the received grid arm.

10. The arc extinguishing device according to claim 9, wherein: The grid parts are provided in plurality, and the grid parts are arranged side by side and spaced from each other along a direction; A plurality of the grid receiving portions and a plurality of the guide ribs are provided, and the plurality of the grid receiving portions and the plurality of the guide ribs are alternately arranged along the one direction.

11. The arc extinguishing device according to claim 4, wherein: The external arc guide comprises: an external space accommodating the internal arc guide; and A plurality of external surfaces, surrounding the external space from a plurality of directions and being continuous with each other; The external space is open on one side facing the grid arm.

12. The arc extinguishing device according to claim 4, wherein: The external arc guide comprises: The external space accommodates the internal arc guide and extends long in one direction; A first outer surface surrounds the outer space from one end in one direction; a second outer surface, continuous with the first outer surface and surrounding the outer space from one side in the extending direction of the grid arm; and The third outer surface is continuous with the second outer surface and surrounds the outer space from the other end in the one direction.

13. The arc extinguishing device according to claim 12, wherein: The external arc guide also includes: The fourth outer surface is continuous with the first outer surface, the second outer surface, and the third outer surface, respectively, and surrounds the outer space from one side in the width direction of the grid body.

14. The arc extinguishing device according to claim 13, wherein: The inner arc guide and the outer arc guide are provided in pairs, respectively, and the pair of the inner arc guides are respectively accommodated in the outer spaces provided in the pair of the outer arc guides; The pair of inner arc guides are disposed to face each other via the pair of fourth outer surfaces provided on the pair of outer arc guides, respectively.

15. The arc extinguishing device according to claim 1, wherein: Also included are side frames respectively combined with the grid portion and the arc guide; The side frame is coupled to the grille portion at a plurality of locations.

16. The arc extinguishing device according to claim 15, wherein: The grid portion comprises: A plurality of grid coupling protrusions protruding from each end in the width direction of the grid body and the width direction of the grid arm toward the side frame; The side frame comprises: A plurality of grid coupling parts are formed to penetrate the interior of the side frame and respectively receive a plurality of the grid coupling protrusions.

17. The arc extinguishing device according to claim 15, wherein: The arc guide comprises: an external fastening hole, recessed and formed on a side of the arc guide member facing the side frame; The side frame comprises: a side fastening hole formed to penetrate the interior of the side frame corresponding to the outer fastening hole; and The side fastener passes through the side fastening hole and is inserted into the external fastening hole.

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