KR20230011113A - Arc extinguish part and circuit breaker part and air circuit breaker include the same - Google Patents

Abstract

Disclosed are an arc extinguishing part, a blocking part, and an air circuit breaker including the same. The present invention provides an arc extinguishing part, a blocking part, and an air circuit breaker, the arc extinguishing part comprising a side plate, a grid, and a grid cover. The grid includes a grid leg, and has a first protection part disposed in a lower part of the grid leg and formed to cover at least a part of the grid leg, and a second protection part disposed in a lower part of the first protection part and formed to cover at least a part of the area where the first protection part is exposed to the outside.

Description

Arc extinguishing part, blocking part and air breaker including the same {Arc extinguish part and circuit breaker part and air circuit breaker include the same}

The present invention relates to an arc extinguishing unit, a blocking unit, and an air circuit breaker including the same, and more particularly, to an arc extinguishing unit, a blocking unit, and an air circuit breaker including the same, which can effectively extinguish an arc generated when a current is interrupted. will be.

A circuit breaker refers to a device capable of allowing or blocking current to the outside by contacting and separating fixed contacts and movable contacts. A fixed contact and a movable contact provided in the circuit breaker are respectively energized and connected to an external power source or load.

The movable contact is movably provided in the circuit breaker. The movable contact can be moved towards or away from the stationary contact. When the movable contact and the fixed contact contact each other, the circuit breaker can be energized with an external power source or load.

When an overcurrent or abnormal current flows in the circuit breaker, the movable contact and the fixed contact in contact are spaced apart from each other. At this time, the current energized between the movable contact and the fixed contact does not immediately disappear, but changes into an arc form and extends along the movable contact.

An arc can be defined as a flow of electrons at high temperature and high pressure. Therefore, when the generated arc stays in the internal space of the circuit breaker for a long time, there is a concern that each component of the circuit breaker may be damaged. In addition, when the arc is discharged to the outside of the circuit breaker without a separate treatment process, there is a risk of injury to the user.

Accordingly, circuit breakers are generally provided with an extinguishing device for extinguishing and discharging an arc. The generated arc passes through the extinguishing device, the arc pressure is increased, the moving speed is increased, and it is cooled at the same time and can be discharged to the outside.

Therefore, the generated arc must be quickly guided to an arc extinguishing device.

However, in the case of a direct current air circuit breaker in which a small current flows among DC air circuit breakers, the power of the generated arc is relatively weak. In addition, since there is no zero point in the current in the case of direct current, arc extinguishing is more difficult than that of alternating current.

In particular, when a small current is cut off in a DC air circuit breaker, since the power of the arc generated inside is relatively weak, a problem occurs in that the arc generated after the cutoff cannot be moved to the grid of the arc extinguishing unit. The arc that has not been extinguished in this way stays adjacent to the movable contact and the fixed contact, causing problems such as melting the contact.

Therefore, it is necessary to consider effectively extinguishing the arc generated when the small current is cut off in the DC air circuit breaker.

An object of the present invention is to provide an air circuit breaker having a structure capable of solving the above problems.

First, an object of the present invention is to provide an air circuit breaker having a structure capable of quickly extinguishing and moving a generated arc.

In addition, an object of the present invention is to provide an air circuit breaker having a structure in which an arc generated when a small current is cut off in a direct current air circuit breaker can quickly move to a grid and be extinguished.

Another object of the present invention is to provide an air circuit breaker having a structure in which a part that forms a magnetic field associated with an arc movement path can be reduced from being damaged by an arc.

In addition, an object of the present invention is to provide an air circuit breaker having a structure in which damage to a grid leg in relation to a moving path of an arc can be reduced.

Another object of the present invention is to provide an air circuit breaker having a structure capable of increasing the pressure generated when an arc is generated by reducing a space in which an arc is generated in relation to a moving path of the arc.

In order to achieve the above object, the present invention provides side plates spaced apart from each other and arranged to face each other, a grid disposed between the side plates, provided in plurality, spaced apart from each other and coupled to the side plates, and an upper side of the grid. and a grid cover that is located and covers the grid, the grid includes grid legs extending downward so as to surround the protruding contacts extending and disposed above the movable contacts from both sides, A first protection part disposed on the lower part and formed to surround at least a part of the grig leg, a first protection part disposed on the lower part of the first protection part, and formed to cover at least a part of an area exposed to the outside of the first protection part. An arc extinguishing unit including the second protection unit is provided.

In addition, the first protection part may be formed long along the longitudinal direction of the side plate.

In addition, the first protector may be provided in plurality and disposed on the side plates disposed to face each other so as to face each other.

In addition, the second protector may be formed long along the longitudinal direction of the side plate, surrounding the first protector.

In addition, the second protector may be provided in plurality, and may be formed to surround each of the first protectors formed to face each other by being coupled to the side plates.

In addition, the first protector may include a first surface surrounding the lower surface of the grid leg, and a first surface extending at a predetermined angle with the first surface, and covering a side surface of the grid leg facing the grid leg disposed on the other side. May contain 2 sides.

In addition, the first protector may include insertion grooves disposed spaced apart from each other along a lengthwise direction so that the grid legs respectively formed in the plurality of grids are inserted, and into which the grid legs can be inserted. there is.

Also, the outermost grid closest to the fixed contact among the grids may have a narrower leg leg width than the rest of the grids.

In addition, the outermost insertion groove for accommodating the grid leg of the outermost grid of the first protection unit is formed to correspond to the width of the grid leg of the outermost grid, and the first protection unit has a fixed contact. A concave region may be formed by being recessed in a direction toward the protruding contact point of the outermost insertion groove disposed in a direction toward.

In addition, the second protection unit includes a first portion formed to cover the first surface of the first protection unit, and a second portion formed to cover the second surface of the first protection unit and extended by being bent with the first portion. can include

In addition, the second protection part is bent with the first part, extends between the first protection part and the side plate, and is bent and extended with a third part coupled to the first protection part and the side plate, and bent with the second part. a fourth part formed to cover a direction away from the fixed contact of the first protection part, and bent and extended with the fourth part, and extending between the first protection part and the side plate, and extending between the first protection part and the side plate. A fifth portion coupled to the side plate may be included.

In addition, a recess region concave inwardly is formed in the first protection part so that the third part and the fifth part can be inserted between the side plate and the first protection part, and the third part And a coupling hole may be formed in the fifth portion so that a coupling member inserted from the outside of the side plate is inserted.

In addition, the second protector may include a gassing material that generates molecules that extinguish the arc when heat generated by the arc generated when the movable contact and the fixed contact are spaced apart is applied.

In addition, an air gap may be formed between the second protection unit and the protruding contact.

In addition, in order to achieve the above object, the present invention includes a movable contact, and the movable contact is configured to move in a direction toward the fixed contact or in a direction away from the fixed contact, to an upper side of the fixed contact. A low runner extending and disposed, one end coupled to the fixed contact point and the other end formed to be spaced apart from the fixed contact point, and disposed extending upward of the movable contact point and contacting the low runner or the row It includes a protruding contact formed to be spaced apart from the runner, wherein the protruding contact provides a blocking portion disposed adjacent to the first protection unit and the second protection unit surrounding grid legs extending downward on both sides of the grid of the arc extinguishing unit. .

The U assembly may include a U assembly disposed between the row runner and the fixed contact bar, away from the fixed contact bar, extending toward the movable contact, and surrounding a side surface of the grid leg.

In addition, the first protector is formed to surround the grid leg and extends in a section corresponding to a section in which the movable contact bar is moved, and the second protector is formed between the first protector and the protruding contact. can be placed in

In addition, the U assembly may be provided in plurality and may extend between the second protection parts formed to be spaced apart from each other.

In addition, in order to achieve the above object, the present invention includes a fixed contact base, a movable contact in which a fixed contact is disposed at the lower end and extends upward, and wherein the movable contact is directed toward the fixed contact or the fixed contact A movable contact point formed to move in a direction away from the movable contact point, a low runner extending upwardly from the fixed contact point, one end coupled to the fixed contact point, and the other end formed to be spaced apart from the fixed contact point, and the movable contact point A protruding contact is disposed extending upwardly and is in contact with the low runner or is formed to be spaced apart from the low runner, and is positioned adjacent to the fixed contact and the movable contact, so that the fixed contact and the movable contact are spaced apart And an arc extinguishing unit configured to extinguish the generated arc, wherein the arc extinguishing unit is spaced apart from each other, disposed to face each other, and disposed between the side plates, provided in plurality, spaced apart from each other, and coupled to the side plates, respectively. a grid, and a grid cover positioned above the grid and covering the grid, wherein the grid extends downward from both sides of the movable contact to surround the protruding contact disposed above the movable contact; Including, a first protection part disposed under the grig leg and formed to surround at least a part of the grig leg, disposed under the first protection part, and exposing the first protection part to the outside. An air circuit breaker including the second protection part formed to cover at least a portion of an area is provided.

According to an embodiment of the present invention, the following effects can be achieved.

According to one embodiment of the present invention, since the electromagnetic force received by the arc due to the magnetic field formed by the grid legs is applied to the arc in a direction toward the grid of the arc extinguishing unit regardless of the current flow direction of the arc, it is independent of the current flow direction of the arc. It has the advantage of being able to quickly extinguish the arc.

In addition, the present invention provides a protruding contact and a low runner contacted in a state in which the fixed contact and the movable contact are spaced apart in the first trip state and a protruding contact and low runner in the second state, so that a small current in the DC air circuit breaker For arcs that occur when breakage occurs, they occur closer to the grid. Accordingly, there is an advantage in that the generated arc is more easily applied and extinguished through the grid.

In addition, since the first protection unit surrounds the plurality of grid legs, and the second protection unit surrounds the first protection unit and is coupled to the side plate, the second protection unit may protect the grid legs and the first protection unit from an arc.

In addition, since the first protection unit and the second protection unit are disposed enclosing the grid, it is possible to reduce separation of the grid from the side plate when an arc is applied to the grid.

In addition, since the second protection unit is disposed below the first protection unit to surround the two bent surfaces of the second protection unit, an area of the first protection unit exposed to the outside from inside the arc extinguishing unit can be minimized. Accordingly, since the direct contact between the first protection unit and the arc is reduced, deterioration of the first protection unit by the arc or impact caused by the arc can be reduced.

In addition, the second protection unit forms an air gap between the protruding contact and the second protection unit, thereby increasing the pressure in the space in which the arc is generated, thereby increasing the lifting force of the generated arc.

Coupling holes are formed in the third and fifth parts of the second protection unit, and a coupling member coupled from the outside of the side plate of the arc extinguishing unit passes through the coupling hole, and the through coupling member passes through the coupling groove formed in the first protection unit. By being coupled to, there is an effect that the side plate of the arc extinguishing unit, the second protection unit and the first protection unit can be firmly coupled to each other.

In addition, the present invention forms an air gap (A.G) between the protruding contact and the grid leg, the second protection unit, or the U assembly, so that the pressure applied to the arc generated between the protruding contact and the low runner increases, thereby generating A force to rise may be applied to the arc.

A relatively narrow air gap (A.G) is formed in the area where the arc is generated, thereby reducing the space of the arc generation area, and thus increasing the pressure applied to the generated arc, so that the generated arc can receive a rising force. there is. Accordingly, the arc can be more easily applied to the grid or the grid legs and extinguished quickly.

1 is a perspective view showing an air circuit breaker according to an embodiment of the present invention.
FIG. 2 is a perspective view illustrating a state in which a rear cover is removed from the air circuit breaker of FIG. 1 .
3 is a front view illustrating a state in which a rear cover is removed from the air circuit breaker of FIG. 1;
FIG. 4 is a plan view illustrating a state in which a rear cover is removed from the air circuit breaker of FIG. 1 .
5 is a cross-sectional view illustrating a state in which a rear cover is removed from an air circuit breaker in which a first protection unit and a second protection unit are disposed according to an embodiment of the present invention.
6 and 7 are perspective views illustrating an arc extinguishing unit provided in the air circuit breaker of FIG. 5 .
FIG. 8 is a front view illustrating an embodiment of an arc extinguishing unit shown in FIG. 5 .
9 is a side view illustrating an embodiment of an arc extinguishing unit shown in FIG. 5 .
FIG. 10 is a bottom view illustrating an embodiment of an arc extinguishing unit shown in FIG. 5 .
FIG. 11 is a conceptual diagram of a magnetic field induced in a grid leg in the air circuit breaker shown in FIG. 5 and a path along which an arc is induced accordingly.
12 is a perspective view illustrating an embodiment of the movable contact band shown in FIG. 5;
FIG. 13 is a perspective view illustrating a blocking unit and an arc extinguishing unit shown in FIG. 5 .
FIG. 14 is a partially enlarged view showing a state in which the protruding contact, low runner, fixed contact, and movable contact of the blocking part and the arc extinguishing part shown in FIG. 13 are contacted or separated in a first trip state.
FIG. 15 is a perspective view illustrating a state in which the blocking unit and the arc extinguishing unit shown in FIG. 13 are disposed in a tripped state.
FIG. 16 is a perspective view of the blocking portion and the arc extinguishing portion shown in FIG. 15 viewed from another direction.
FIG. 17 is a front view illustrating a blocking portion and an arc extinguishing portion shown in FIG. 16 .
18 and 19 are conceptual diagrams of a magnetic field induced in a grid leg and an arc induction path (AP) of an arc according to an embodiment of the present invention.
20 is a cross-sectional view showing a state in which a rear cover is removed from an air circuit breaker to which a U assembly is additionally disposed according to another embodiment of the present invention.
21 and 22 are perspective views illustrating an arc extinguishing unit provided in the air circuit breaker of FIG. 20 .
23 is an exploded perspective view illustrating the U assembly of FIG. 20;
FIG. 24 is a front view illustrating a blocking portion and an arc extinguishing portion shown in FIG. 20 .
FIG. 25 is a side view illustrating the arc extinguishing unit and U assembly shown in FIG. 20 .
FIG. 26 is a bottom view illustrating the arc extinguishing unit shown in FIG. 20;
FIG. 27 is a conceptual diagram of a magnetic field induced in a grid leg and an arc induction path (AP) of an arc in the air circuit breaker shown in FIG. 20 .

Hereinafter, a blocking unit according to an embodiment of the present invention and an air circuit breaker including the same will be described in detail with reference to the accompanying drawings.

In the following description, descriptions of some components may be omitted to clarify the characteristics of the present invention.

1. Definition of terms

The term "conductivity" used in the following description means that a current or an electrical signal is transmitted between one or more members.

The term "magnet" used in the following description refers to any object capable of magnetizing a magnetic body or generating a magnetic field. In one embodiment, the magnet may be provided as a permanent magnet or an electromagnet.

The term "air circuit breaker" used in the following description means a circuit breaker configured to extinguish an arc using air or compressed air. It is assumed that each configuration described below is applied to an air circuit breaker.

However, each configuration described below may be applied to an air circuit breaker, a compressed air circuit breaker, a gas circuit breaker, an oil circuit breaker, and a vacuum circuit breaker.

The term "magnetic field (MF)" used in the following description means a magnetic field formed by a magnet. Or, it means a magnetic field formed by a plurality of magnets disposed adjacent to each other. That is, the magnetic field M.F. means a magnetic field formed by one or a plurality of magnets.

The term "Magnetic Field Area (MFA)" means an area of a magnetic field formed by a magnet or the like. In particular, it means a place where a magnetic field formed by a magnet or a magnetized magnetic body affects a section where an arc is generated.

“Arc-generation Area (A.A)” means an area where an arc is generated. Means an area where the movable contact and the fixed contact 311 are spaced apart and an arc is likely to occur. In particular, when there is a protruding contact 322, the protruding contact 322 and the low runner are spaced apart and the possibility of an arc occurring I mean this high area.

"Arc-guided Path (A.P)" refers to the direction of the electromagnetic force received by the Lorentz force on the arc generated by the grid as the grid according to an embodiment of the present invention is magnetized. The path of the arc may be induced by the electromagnetic force generated by the Lorentz force.

The terms “upper side”, “lower side”, “right side”, “left side”, “front side” and “rear side” used in the following description will be understood through the coordinate system shown in FIG. 1 .

2. Description of the configuration of the air circuit breaker 10 according to the embodiment of the present invention

1 to 5 , an air circuit breaker 10 according to an embodiment of the present invention includes a cover part 100, a driving part 200, a blocking part 300, and an arc extinguishing part 600.

(1) Description of the cover part 100

1 to 5 , an air circuit breaker 10 according to an embodiment of the present invention includes a cover part 100.

The cover part 100 forms the outer shape of the air circuit breaker 10 . In addition, a space is formed inside the cover part 100, and each component for operating the air circuit breaker 10 can be mounted. That is, the cover part 100 functions as a kind of housing.

The cover part 100 may be formed of a material with high heat resistance and high rigidity. This is to prevent damage to each component mounted inside and to prevent damage caused by an arc generated inside. In one embodiment, the cover part 100 may be formed of synthetic resin or reinforced plastic.

In the illustrated embodiment, the cover portion 100 has a rectangular pillar shape having a height in the vertical direction. The shape of the cover unit 100 may be provided in any shape capable of mounting components for operating the air circuit breaker 10 therein.

The inner space of the cover part 100 is electrically connected to the outside. Each component mounted inside the cover unit 100 may be electrically connected to an external power source or load.

In the illustrated embodiment, the cover part 100 includes an upper cover 110 and a lower cover 120 .

The upper cover 110 forms the upper side of the cover part 100 . The upper cover 110 is positioned above the lower cover 120 . In one embodiment, the upper cover 110 and the lower cover 120 may be integrally formed.

A space is formed inside the upper cover 110 . Various components provided in the air circuit breaker 10 are mounted in the space. In one embodiment, the blocking unit 300 and the arc extinguishing unit 600 may be mounted in the inner space of the upper cover 110 .

The inner space of the upper cover 110 communicates with the inner space of the lower cover 120 . Components such as the blocking portion 300 may be accommodated throughout the inner space of the upper cover 110 and the inner space of the lower cover 120 .

An arc extinguishing unit 600 is located on one side of the upper cover 110, on the upper side in the illustrated embodiment. The arc extinguishing unit 600 may be partially exposed on the upper surface of the upper cover 110 . The arc generated in the inner space of the upper cover 110 passes through the arc extinguishing unit 600 and is extinguished to be discharged to the outside of the air circuit breaker 10 .

On the other side of the upper cover 110, the front side in the illustrated embodiment, the fixed contact point 310 of the blocking unit 300 is exposed. The fixed contact point 310 may be electrically connected to an external power source or load through the exposed portion.

In the illustrated embodiment, the top cover 110 includes a first top cover 111 and a second top cover 112 .

The first upper cover 111 is configured to cover one side of the upper side of the air circuit breaker 10, the front side in the illustrated embodiment. The first upper cover 111 is coupled to the second upper cover 112 by any fastening means.

An opening is formed in the first upper cover 111 . The fixed contact point 310 may be exposed to the outside through the opening. In the illustrated embodiment, three openings are formed in the left and right directions.

The second upper cover 112 is configured to cover the other side of the upper side of the air circuit breaker 10, the rear side in the illustrated embodiment. The second upper cover 112 is coupled to the first upper cover 111 by any fastening means.

The lower cover 120 forms the lower side of the cover part 100 . The lower cover 120 is located below the upper cover 110 .

A space is formed inside the lower cover 120 . Various components provided in the air circuit breaker 10 are mounted in the space. In one embodiment, the driving unit 200 and the blocking unit 300 may be mounted in the inner space of the lower cover 120 .

The inner space of the lower cover 120 communicates with the inner space of the upper cover 110 . Components such as the blocking unit 300 may be accommodated throughout the inner space of the lower cover 120 and the inner space of the upper cover 110 .

On one side of the lower cover 120, in the illustrated embodiment, the movable contact band 320 of the blocking unit 300 is located on the front side. The movable contact stand 320 may be exposed to the outside through an opening formed in the lower cover 120 . The movable contact bar 320 may be electrically connected to an external power source or load through the exposed portion.

(2) Description of the drive unit 200

1 to 5 , an air circuit breaker 10 according to an embodiment of the present invention includes a driving unit 200.

The driving unit 200 is rotated as the fixed contact 311 and the movable contact 321 of the blocking unit 300 are spaced apart, thereby performing a trip mechanism. Accordingly, the air circuit breaker 10 can be cut off from energization to the outside, and the user can recognize that an operation to cut off the energization has been performed.

The driving unit 200 is accommodated inside the air circuit breaker 10 . Specifically, the driving unit 200 is partially accommodated in a space inside the cover unit 100 . In addition, the remaining parts of the driving unit 200 are accommodated inside a case provided on one side (rear side in the illustrated embodiment) of the cover unit 100, which is not given reference numerals.

The driving unit 200 is connected to the blocking unit 300 . Specifically, the crossbar 220 of the driving unit 200 is configured to rotate together with the rotation of the movable contact bar 320 of the blocking unit 300 .

Therefore, when the movable contact bar 320 of the blocking unit 300 is rotated and moved, the driving unit 200 can be rotated together. The driving unit 200 is rotatably accommodated inside the air circuit breaker 10 .

In the illustrated embodiment, the driving unit 200 includes a shooter 210, a crossbar 220 and a lever 230.

The shooter 210 rotates as the movable contact point 320 of the blocking unit 300 rotates in a direction away from the fixed contact point 310. The shooter 210 is connected to the crossbar 220 and the lever 230.

Specifically, one end of the shooter 210 is constrained by the crossbar 220 . An elastic member is provided at the other end of the shooter 210 . Accordingly, in a state in which the fixed contact 311 and the movable contact 321 are in contact, the shooter 210 presses the elastic member and stores restoring force. The external force for the pressing may be provided by a state in which the crossbar 220 is rotated toward the fixed contact point 310 .

When the movable contact 321 is separated from the fixed contact 311, the movable contact 320 is rotated in a direction away from the fixed contact 310. Accordingly, the crossbar 220 is also rotated, and one end of the shooter 210 is released and rotated by the restoring force provided by the elastic member.

The shooter 210 is connected to the lever 230. As the shooter 210 rotates and strikes the lever 230, the lever 230 also rotates and a trip operation may be performed.

The crossbar 220 is connected to the movable contact bar 320 and rotates as the movable contact bar 320 rotates. Accordingly, the shooter 210 restrained by the crossbar 220 may be released and a trip operation may be performed.

The crossbar 220 may extend between the plurality of blocking parts 300 . In the illustrated embodiment, a total of three movable contact points 320 of the blocking unit 300 are provided and disposed in the left and right directions. The crossbar 220 may be connected by penetrating the plurality of movable contact points 320 disposed in the left and right directions.

The crossbar 220 contacts the one end of the shooter 210 and restrains the shooter 210 . When the crossbar 220 is rotated together with the movable contact bar 320, the crossbar 220 releases the one end of the shooter 210.

The lever 230 may be rotated by hitting the rotating shooter 210 . The lever 230 may be partially exposed to the outside of the air circuit breaker 10 . When the trip operation is performed by the blocking unit 300, the lever 230 is rotated in a preset direction.

Accordingly, the user can easily recognize that the trip operation has been performed. In addition, the user can rotate the lever 230 to adjust the air circuit breaker 10 to a state in which electricity can be re-energized.

Since the process of performing the tripping operation by the driving unit 200 is a well-known technique, a detailed description thereof will be omitted.

(3) Description of the blocking unit 300

Referring to FIGS. 1 to 5 , the air circuit breaker 10 according to an embodiment of the present invention includes a blocking unit 300 .

The blocking unit 300 includes a fixed contact point 310 and a movable contact point 320 that are spaced apart from or in contact with each other.

When the fixed contact point 310 and the movable contact point 320 come into contact with each other, the air circuit breaker 10 can be energized with an external power source or load. When the fixed contact point 310 and the movable contact point 320 are spaced apart, the air circuit breaker 10 is disconnected from an external power supply or load. At this time, the external power applied to the air circuit breaker 10 may be DC power. In addition, the external power applied to the air circuit breaker 10 may be a small current.

The blocking unit 300 is accommodated inside the air circuit breaker 10 . Specifically, the blocking part 300 is rotatably accommodated in the inner space of the cover part 100 .

The blocking unit 300 may be electrically connected to the outside. In one embodiment, current from an external power source or load may flow into any one of the fixed contact point 310 and the movable contact point 320. In addition, current may flow from the other one of the fixed contact point 310 and the movable contact point 320 to an external power source or load.

The blocking part 300 may be partially exposed to the outside of the air circuit breaker 10 . Accordingly, the blocking unit 300 may be electrically connected to an external power source or load through a member such as a conducting wire (not shown).

A plurality of blocking units 300 may be provided. A plurality of blocking parts 300 may be disposed spaced apart from each other in one direction. Between each blocking unit 300 , a barrier rib for preventing interference between currents flowing through each blocking unit 300 may be provided.

In the illustrated embodiment, the blocking unit 300 is provided with three. In addition, the three blocking parts 300 are spaced apart from each other in the left and right directions of the air circuit breaker 10 . The number of blocking units 300 may be changed according to the amount of current flowing through the air circuit breaker 10 .

In the illustrated embodiment, the blocking unit 300 includes a fixed contact unit 310 and a movable contact unit 320.

fixed contact strip

The fixed contact point 310 may be in contact with or spaced apart from the movable contact point 320 . When the movable contact point 320 contacts the fixed contact point 310, the air circuit breaker 10 can be energized with an external power source or load. When the fixed contact point 310 and the movable contact point 320 are spaced apart, the air circuit breaker 10 is disconnected from an external power supply or load.

The fixed contact point 310 extends upward and may extend toward the row runner 330 at a predetermined angle.

As can be seen from the name, the fixed contact point 310 is fixedly installed on the cover part 100 . Therefore, contact and separation between the fixed contact band 310 and the movable contact band 320 are achieved by the rotation of the movable contact band 320 .

In the illustrated embodiment, the fixed contact strip 310 is accommodated in the inner space of the upper cover 110 .

The fixed contact point 310 may be partially exposed to the outside of the air circuit breaker 10 . Through the exposed portion, the fixed contact point 310 can be electrically connected to an external power source or load.

In the illustrated embodiment, the fixed contact point 310 is exposed to the outside through an opening formed on the front side of the upper cover 110 .

The fixed contact point 310 may be formed of a material having electrical conductivity. In one embodiment, the fixed contact band 310 may be formed of copper (Cu) or iron (Fe) and an alloy material including these.

In the illustrated embodiment, a fixed contact 311 is disposed at the lower end of the fixed contact stand 310 . Also, the stationary contact stand 310 extends upward.

The fixed contact 311 may be in contact with or separated from the movable contact 321 . The fixed contact 311 is located on one side of the fixed contact strip 310 facing the movable contact strip 320, the rear side in the illustrated embodiment.

The stationary contact 311 is electrically connected to the stationary contact band 310 . In the illustrated embodiment, the fixed contact 311 is located on the rear side of the fixed contact strip 310 . In one embodiment, the fixed contact point 311 may be integrally formed with the fixed contact point 310 .

When the fixed contact 311 and the movable contact 321 come into contact, the air circuit breaker 10 is energized with an external power source or load. In addition, when the fixed contact point 311 is spaced apart from the movable contact point 321, the air circuit breaker 10 is disconnected from an external power source or load.

low runner

The row runner 330 may extend and protrude upward from the fixed contact point 311 . The row runner 330 may extend upward toward the arc extinguishing unit 600 . One end of the row runner 330 is coupled to the fixed contact point 310 and the other end is formed to be spaced apart from the fixed contact point 310 . That is, the distance the row runner 330 is separated from the fixed contact point 310 may increase as it goes upward.

The row runner 330 is electrically connected to the fixed contact point 310 . In the illustrated embodiment, the row runner 330 is located on the rear side of the stationary contact strip 310 . In one embodiment, the row runner 330 may be integrally formed with the fixed contact point 310 .

When the fixed contact point 311 and the movable contact point 320 contact each other, the row runner 330 may contact a protruding contact point 322 to be described later and conduct electricity.

The low runner 330 may serve to induce an arc generated when the fixed contact 311 and the movable contact 320 are separated from each other and transfer it to the grid 620 . To this end, the row runner 330 may be formed of a magnetic material having magnetism. This is to apply an attractive force to the arc, which is the flow of electrons.

In addition, while the low runner 330 and the protruding contact 322 are in contact with each other, an arc may occur between the low runner 330 and the protruding contact 322 . This will be described later in detail.

movable contact strip

The movable contact point 320 may be in contact with or separated from the fixed contact point 310 . As described above, the air circuit breaker 10 can be energized or cut off from an external power source or load by contact and separation between the movable contact point 320 and the fixed contact point 310.

The movable contact stand 320 may include an extension 320a in which the movable contact 321 is disposed and at least a portion of the area extends upward. Specifically, referring to the drawings, at least a portion of the movable contact bar 320 may extend upward. A protruding contact point 322 may be disposed on the extension portion 320a.

The movable contact stand 320 is rotatably installed in the inner space of the cover unit 100 . The movable contact band 320 may be rotated in a direction toward the fixed contact band 310 and in a direction away from the fixed contact band 310 .

In the illustrated embodiment, the movable contact bar 320 is accommodated in the inner space of the upper cover 110 and the lower cover 120 . It is as described above that each inner space of the upper cover 110 and the lower cover 120 may communicate with each other.

The movable contact point 320 may be partially exposed to the outside of the air circuit breaker 10 . Through the exposed portion, the movable contact point 320 can be electrically connected to an external power source or load.

In the illustrated embodiment, the movable contact bar 320 is exposed to the outside through an opening formed on the front side of the lower cover 120 .

The movable contact point 320 may be formed of a material having electrical conductivity. In one embodiment, the movable contact bar 320 may be formed of copper or iron and an alloy material including these.

The movable contact point 320 is connected to the driving unit 200 . Specifically, the movable contact bar 320 is connected to the crossbar 220 of the drive unit 200 . In one embodiment, the crossbar 220 may be coupled through the movable contact bar 320 .

When the movable contact bar 320 is rotated, the crossbar 220 may also be rotated. Accordingly, it is as described above that the driving unit 200 is operated to perform the trip operation.

In the illustrated embodiment, the movable contact base 320 includes a movable contact 321 and a rotation shaft 328 .

The movable contact 321 may contact or be separated from the fixed contact 311 . The movable contact 321 is located on one side of the movable contact 320 facing the fixed contact 310, the front side in the illustrated embodiment.

The movable contact 321 may rotate together with the movable contact stand 320 . When the movable contact bar 320 rotates toward the stationary contact bar 310, the movable contact 321 also rotates toward the stationary contact 311 and can come into contact with the stationary contact 311.

In addition, when the movable contact point 320 is rotated in a direction away from the fixed contact point 310, the movable contact 321 may also be spaced apart from the fixed contact 311.

The movable contact 321 is energized with the movable contact band 320 . In the illustrated embodiment, the movable contact 321 is located on the front side of the movable contact bar 320. In one embodiment, the movable contact 321 may be integrally formed with the movable contact stand 320 .

As described above, the air circuit breaker 10 is energized or cut off from an external power source or load by contact and separation between the movable contact 321 and the fixed contact 311 .

An arc is generated when the fixed contact 311 and the movable contact 321 are separated from each other while being in contact with each other and being energized. The air circuit breaker 10 according to the embodiment of the present invention includes various components for effectively forming the path of the generated arc. A detailed description thereof will be described later.

The rotating shaft 328 is a part where the movable contact bar 320 is rotatably coupled to the cover part 100 . The movable contact band 320 may be rotated in a direction toward the fixed contact band 310 or away from the fixed contact band 310 about the rotation shaft 328 .

The rotating shaft 328 is located on the other side of the movable contact bar 320 opposite to the fixed contact bar 310, the rear side in the illustrated embodiment.

(4) Description of arc extinguishing unit 600

Referring to the drawings, an air circuit breaker 10 according to an embodiment of the present invention includes an arc extinguishing unit 600.

The arc extinguishing unit 600 is configured to extinguish an arc generated when the fixed contact 311 and the movable contact 321 are spaced apart. The generated arc passes through the arc extinguishing unit 600 and may be discharged to the outside of the air circuit breaker 10 after being extinguished and cooled.

The arc extinguishing unit 600 is coupled to the cover unit 100 . One side of the arc extinguishing unit 600 for arc discharge may be exposed to the outside of the cover unit 100 . In the illustrated embodiment, the upper side of the arc extinguishing unit 600 is exposed to the outside of the cover unit 100 .

The arc extinguishing unit 600 is partially accommodated in the cover unit 100 . A portion of the arc extinguishing unit 600 except for a portion exposed to the outside may be accommodated in the inner space of the cover unit 100 . In the illustrated embodiment, the arc extinguishing unit 600 is partially accommodated on the upper side of the upper cover 110 .

The arrangement may be changed according to the positions of the fixed contact 311 and the movable contact 312 . That is, the arc extinguishing unit 600 may be located adjacent to the fixed contact 311 and the movable contact 312 . Accordingly, an arc extending along the movable contact 312 rotated away from the fixed contact 311 can easily enter the arc extinguishing unit 600 .

A plurality of arc extinguishing units 600 may be provided. The plurality of arc extinguishing units 600 may be physically and electrically spaced apart from each other. In the illustrated embodiment, the arc extinguishing unit 600 is provided with three.

That is, each arc extinguishing unit 600 is located adjacent to each fixed contact 311 and each movable contact 321 . In the illustrated embodiment, each arc extinguishing unit 600 is located adjacent to the upper side of each of the fixed contact 311 and the movable contact 321 .

The arc extinguishing units 600 may be disposed adjacent to each other. In the illustrated embodiment, three arc extinguishing units 600 are arranged side by side in the left and right directions of the air circuit breaker 10 .

In the illustrated embodiment, the arc extinguishing unit 600 includes a side plate 610 , a grid 620 , a grid cover 630 and an arc runner 650 .

Side plates 610 form both sides of arc extinguishing section 600, right and left in the illustrated embodiment. The side plate 610 is coupled to each component of the arc extinguishing unit 600 and supports the components.

Specifically, the side plate 610 is combined with the grid 620 , the grid cover 630 and the arc runner 650 .

A plurality of side plates 610 are provided. The plurality of side plates 610 may be spaced apart from each other and disposed to face each other. In the illustrated embodiment, two side plates 610 are provided, forming the right and left sides of the arc extinguishing unit 600, respectively.

The side plate 610 may be formed of an insulating material. This is to prevent the generated arc from flowing toward the side plate 610 .

The side plate 610 may be formed of a heat-resistant material. This is to prevent damage or shape deformation by the generated arc.

A plurality of through holes are formed in the side plate 610 . A grid 620 and an arc runner 650 may be inserted and coupled to some of the through holes. In addition, a fastening member for fastening the grid cover 630 to the side plate 610 may be penetrated into another part of the through hole.

In the illustrated embodiment, the side plate 610 is provided in the form of a plate having a plurality of corners formed at vertices. The side plates 610 form both sides of the arc extinguishing unit 600 and may be provided in any shape capable of supporting each component of the arc extinguishing unit 600 .

The side plate 610 is coupled with the grid 620 . Specifically, insertion protrusions provided on both sides of the grid 620, in the illustrated embodiment, the right end and the left end are inserted and coupled to some of the through holes of the side plate 610.

Side plate 610 is coupled to the grid cover (630). Specifically, the grid cover 630 is coupled to the upper side of the side plate 610 . The coupling may be achieved by a fitting coupling between the side plate 610 and the grid cover 630 or by a separate fastening member.

The side plate 610 is coupled to the arc runner 650. Specifically, the arc runner 650 is coupled to the rear side of the side plate 610, that is, to one side opposite to the fixed contact point 311. The coupling may be achieved by a separate fastening member.

The grid 620 guides an arc generated when the fixed contact 311 and the movable contact 321 are spaced apart to the arc extinguishing unit 600 .

The grid 620 may be formed of a material having magnetism. This is to apply an attractive force to the arc, which is the flow of electrons.

A plurality of grids 620 may be provided. A plurality of grids 620 may be spaced apart from each other and stacked. In the illustrated embodiment, a plurality of grids 620 are provided and stacked in the front-back direction.

The number of grids 620 may vary. Specifically, the number of grids 620 may be changed according to the size and performance of the arc extinguishing unit 600 or the rated capacity of the air circuit breaker 10 in which the arc extinguishing unit 600 is provided.

An introduced arc may be subdivided and flowed through a space in which the plurality of grids 620 are spaced apart from each other. Accordingly, the pressure of the arc may be increased, and the moving speed and arc extinguishing speed of the arc may be increased.

The arc runner 650 is positioned adjacent to the grid 620 furthest from the fixed contact point 311 among the plurality of grids 620, the grid 620 on the rear side in the illustrated embodiment.

The grid 620 may protrude downward in a direction toward the fixed contact point 311 , that is, at an end of the grid 620 in the width direction, in the illustrated embodiment, in the left and right direction. That is, the grid 620 is formed in a peak shape with left and right ends pointing downward.

Accordingly, the generated arc effectively proceeds toward the end of the grid 620 in the left-right direction, and can easily flow to the arc extinguishing unit 600 .

Grid 620 is coupled to side plate 610 . Specifically, a plurality of coupling protrusions are formed at the corners of the grid 620 in the width direction, left and right direction in the illustrated embodiment, in the extension direction, in the vertical direction in the illustrated embodiment. The coupling protrusions of the grid 620 are inserted into and coupled to through holes formed in the side plate 610 .

One side of the grid 620 facing the grid cover 630, the upper end in the illustrated embodiment, may be positioned adjacent to the grid cover 630. The arc flowing along the grid 620 may pass through the grid cover 630 and be discharged to the outside.

The grid cover 630 forms an upper side of the arc extinguishing unit 600 . The grid cover 630 is configured to cover an upper end of the grid 620 . An arc passing through a space in which the plurality of grids 620 are spaced apart from each other may be discharged to the outside of the air circuit breaker 10 through the grid cover 630 .

The grid cover 630 is coupled to the side plate 610 . Protrusions inserted into the through-holes of the side plate 610 may be formed at the corners of the grid cover 630 in the width direction and in the left-right direction in the illustrated embodiment. In addition, the grid cover 630 and the side plate 610 may be coupled by a separate fastening member.

The grid cover 630 extends in one direction, in the front-rear direction in the illustrated embodiment. It will be understood that the direction is the same as the direction in which the plurality of grids 620 are stacked.

The length of the grid cover 630 in the other direction, the width direction in the illustrated embodiment, may be determined according to the length of the plurality of grids 620 in the width direction.

In the illustrated embodiment, the grid cover 630 includes a cover body 631, an upper frame 632, a mesh portion 633, and a blocking plate (not shown).

The cover body 631 forms the outer shape of the grid cover 630 . The cover body 631 is coupled to the side plate 610 . In addition, the upper frame 632 is coupled to the cover body 631 .

A predetermined space is formed inside the cover body 631 . The space may be covered by an upper frame 632 . The mesh portion 633 and the blocking plate are accommodated in the space. Accordingly, the space may be referred to as an “accommodating space”.

The receiving space communicates with a space formed by spacing the grids 620 apart. As a result, the receiving space communicates with the inner space of the cover part 100 . Accordingly, the generated arc may flow into the accommodation space of the cover body 631 by passing through the space formed by the separation of the grids 620 .

An upper end of the grid 620 may be in contact with one side of the cover body 631 facing the grid 620, the lower side in the illustrated embodiment. In one embodiment, cover body 631 may support the top end of grid 620 .

The cover body 631 may be formed of an insulating material. This is to prevent distortion of the magnetic field for forming the arc induction path A.P.

The cover body 631 may be formed of a heat-resistant material. This is to prevent damage or shape deformation by the generated arc.

In the illustrated embodiment, the length of the cover body 631 in the front-back direction is longer than the length in the left-right direction. The shape of the cover body 631 may be changed according to the shape of the side plate 610 and the shape and number of the grid 620 .

One side of the cover body 631 opposite to the grid 620, the upper frame 632 is coupled to the upper side in the illustrated embodiment.

The upper frame 632 is coupled to the upper side of the cover body 631 . The upper frame 632 is configured to cover the accommodating space formed in the cover body 631, the mesh portion 633 accommodated in the accommodating space, and the blocking plate.

In the illustrated embodiment, the length of the upper frame 632 in the front-back direction is longer than the length in the left-right direction. The upper frame 632 is stably coupled to the upper side of the cover body 631 and may be provided in an arbitrary shape capable of covering the accommodation space and components accommodated in the accommodation space.

A plurality of through holes are formed in the upper frame 632 . Through the through hole, an arc passing between the grids 620 and extinguished may be discharged. In the illustrated embodiment, the through-holes are provided in three lines in the front and rear directions, three in the left and right directions, so that a total of nine is formed. The number of through holes may vary.

The through holes are spaced apart from each other. A kind of rib is formed between the through holes. The rib may press the mesh portion 633 accommodated in the space of the cover body 631 and the blocking plate from the upper side.

Accordingly, even if an arc is generated, the mesh portion 633 and the blocking plate are not arbitrarily separated from the accommodation space of the cover body 631 .

The upper frame 632 may be fixedly coupled to the upper side of the cover body 631 . In the illustrated embodiment, the upper frame 632 is fixedly coupled to the upper side of the cover body 631 by a fastening member.

The mesh portion 633 and the blocking plate are positioned in the receiving space of the cover body 631 between the upper frame 632 and the cover body 631, that is, on the lower side of the upper frame 632. In other words, the mesh portion 633 and the blocking plate are stacked from top to bottom in the accommodation space of the cover body 631 .

The mesh portion 633 passes through the space formed between the grids 620 and serves to filter out impurities remaining in the extinguished arc. The extinguished arc passes through the mesh portion 633 and may be discharged to the outside after remaining impurities are removed. That is, the mesh unit 633 functions as a kind of filter.

The mesh portion 633 includes a plurality of through holes. It is preferable that the size, that is, the diameter of the through hole is smaller than the diameter of the impurity particles remaining in the arc. In addition, it is preferable that the diameter of the through hole is sufficiently large so that the gas included in the arc can pass through.

A plurality of mesh units 633 may be provided. The plurality of mesh parts 633 may be stacked in a vertical direction. Accordingly, impurities remaining in the arc passing through the mesh portion 633 can be effectively removed.

The mesh portion 633 is accommodated in the accommodation space formed inside the cover body 631 . The shape of the mesh part 633 may be determined according to the shape of the accommodation space.

The mesh part 633 is located on the lower side of the upper frame 632 . The plurality of through holes formed in the mesh portion 633 communicate with the plurality of through holes formed in the upper frame 632 . Accordingly, the arc passing through the mesh portion 633 may pass through the upper frame 632 and be discharged to the outside.

A plurality of through-holes formed in the mesh portion 633 communicate with a space in which the grid 620 is spaced apart. As a result, the plurality of through holes formed in the mesh part 633 communicate with the inner space of the cover part 100 .

A blocking plate is positioned below the mesh portion 633 . The blocking plate provides a passage for the arc passing through the space formed between the grids 620 to flow toward the mesh portion 633 . The blocking plate is accommodated in the accommodation space of the cover body 631. The blocking plate is located at the lowermost side of the accommodating space of the cover body 631 .

In the illustrated embodiment, the blocking plate is formed to have a rectangular cross section in which the length in the front-back direction is longer than the length in the left-right direction. The shape of the blocking plate can be changed according to the shape of the cross section of the accommodation space of the cover body 631 .

A grid 620 is positioned below the blocking plate. In one embodiment, the upper end of the grid 620, ie one end of the grid 620 facing the blocking plate, may contact the blocking plate. The blocking plate includes a through hole (not shown).

The through hole is a passage through which an arc passing through a space formed by spacing a plurality of grids 620 from each other flows into the accommodation space of the cover body 631 . Through-holes are formed through in a direction perpendicular to the blocking plate, in a vertical direction in the illustrated embodiment.

A plurality of through holes may be formed. A plurality of through holes may be spaced apart from each other.

The arc runner 650 is located on one side of the side plate 610 facing the fixed contact 311 and the movable contact 321 . In the illustrated embodiment, the arc runner 650 is located on the underside of the side plate 610 .

The arc runner 650 is located on the other side of the side plate 610 opposite to the fixed contact point 311 . Specifically, the arc runner 650 is located on the rear side from the lower side of the side plate 610 so as to be opposite to the fixed contact 311 located on the front side of the side plate 610 .

The arc runner 650 is coupled to the side plate 610 . The coupling may be formed by inserting a protrusion formed at an end portion of the arc runner 650 in a left-right direction into a through-hole formed in the side plate 610 .

The arc runner 650 may be formed of a conductive material. This is to induce the arc effectively by applying a suction force to the flowing arc. In one embodiment, the arc runner 650 may be formed of copper, iron, or an alloy including these.

The arc runner 650 extends toward the grid 620 by a predetermined length. In one embodiment, the arc runner 650 may be arranged to cover from the rear side the grid 620 located furthest from the stationary contact 311, the grid 620 located at the rearmost side in the illustrated embodiment. can

Accordingly, since the arc does not extend beyond the grid 620 located at the rearmost side, damage to the cover unit 100 can be prevented. Also, the generated arc can be effectively directed toward the grid 620 .

3. Description of the protruding contact 322

The blocking unit 300 according to an embodiment of the present invention may further include a protruding contact point 322 .

The protruding contact 322 may be spaced apart from the movable contact 321 and disposed on the extension 320a. That is, the protruding contact 322 is spaced apart from the movable contact 321 along the extension 320a and disposed above the movable contact 321 . In this case, the protruding contact 322 may be disposed to contact the low runner 330 in a state in which the movable contact 321 is in contact with the fixed contact 311 .

When the protruding contact point 322 and the row runner 330 come into contact with each other, current may be applied between the protruding contact point 322 and the row runner 330 .

Also, when the movable contact stand 320 is tripped, the protruding contact 322 and the low runner 330 are also separated, and an arc may be generated between the protruding contact 322 and the low runner 330 in this process.

The protruding contact 322 is disposed extending from at least one of the plurality of movable contacts 321 .

For example, the protruding contact 322 is formed by protruding three of the five movable contacts 321, the first, third, and fifth movable contacts 321 protruding, or the second and fourth movable contacts 321. The movable contact 321 may protrude. Alternatively, in a case different from the case described above, the protruding contact 322 may be formed extending from at least one of the movable contacts 321 .

In one embodiment of the present invention, as shown in FIG. 12 , the protruding contact 322 may protrude from an upper side of the centrally disposed movable contact 321 among the plurality of movable contacts 321 .

The protruding contact point 322 may extend upward so as to overlap at least a portion of the side plate 610 of the arc extinguishing unit 600 disposed above the protruding contact point 322 .

Specifically, as shown in FIG. 16 , the protruding contact 322 may extend so that an upper portion of the protruding contact 322 overlaps the side plate 610 of the arc extinguishing unit 600 . Through this, the generated arc can be more quickly applied to the grid 620 and extinguished.

The width of the protruding contact 322 may correspond to the width of the movable contact 321 to which the protruding contact 322 extends.

Specifically, referring to FIG. 12 , the width of the protruding contact 322 corresponds to the width of the movable contact 321 from which the protruding contact 322 extends. In other words, the width of the protruding contact 322 may be the same as or similar to the width of the movable contact 321 from which the protruding contact 322 extends. Through this, interference with adjacent movable contacts 321 or interference between adjacent protruding contacts 322 when a plurality of protruding contacts 322 are formed can be reduced.

4. Trip operation of the movable contact bar 320 and movement of the arc generation area (A.A)

In this embodiment, the arc generating region includes a first arc generating region A.A1 and a second arc generating region A.A2.

The first arc generating region A.A1 is formed between the fixed contact 311 and the movable contact 321 . The second arc generating region A.A2 is formed between the protruding contact 322 and the low runner 330 .

The low runner 330 may play the same role as the fixed contact point 311 in relation to the protruding contact point 322 . Thus, the second arc generating region A.A2 may be formed between the protruding contact point 322 and the low runner 330 .

The protruding contact 322 is disposed above the movable contact 321 on the movable contact stand 320 . At this time, the protruding contact 322 and the low runner 330 are separated later than when the movable contact 321 and the fixed contact 311 are separated for a very short moment.

Specifically, referring to FIG. 14, when the trip operation of the movable contact stand 320 is generated to separate the movable contact 321 from the fixed contact 311, the movable contact 321 and the fixed contact are separated with a very short time difference. 311 may be spaced apart first, and then protruding contact 322 and low runner 330 may be spaced apart.

That is, when the blocking unit 300 performs a tripping operation, the protruding contact 322 and the low runner 330 are spaced later than the movable contact 321 and the fixed contact 311, so that the movable contact 321 and Even after energization is interrupted between the fixed contacts 311, energization occurs between the protruding contact 322 and the low runner 330 for a short time.

This will be described in relation to the trip state.

The movable contact stand 320 is in an energized state in which the movable contact 321 and the fixed contact 311 are in contact, and the low runner 330 and the protruding contact 322 are in contact, and the movable contact 321 and the fixed contact ( 311) is spaced apart, and the low runner 330 and protruding contact 322 are made movable between spaced trip states.

Specifically, FIG. 13 is a diagram showing an energized state. The movable contact 321 and the protruding contact 322 contact the fixed contact 311 and the low runner 330, respectively, and are energized.

At this time, since DC power is applied as described above, current may flow from the fixed contact 311 and the low runner 330 to the movable contact 321 and the protruding contact 322 or vice versa.

The trip state of the movable contact stand 320 is a first state in which the movable contact 321 and the fixed contact 311 are spaced apart and contact between the low runner 330 and the protruding contact 322 is maintained, and the movable contact ( 321) and the fixed contact 311 are spaced apart, and the low runner 330 and the protruding contact 322 are spaced apart. And, the trip state of the movable contact bar 320 may be sequentially changed to the first state and the second state.

Specifically, FIG. 13 shows an energized state, FIG. 14 shows a first state, and FIG. 15 shows a second state.

Referring to FIG. 14 , in the first state, the movable contact 321 and the fixed contact 311 are spaced apart from each other. And, in the first state, contact is maintained between the low runner 330 and the protruding contact point 322 . Therefore, in the first state, a complete trip has not yet occurred, and current is applied through the low runner 330 and the protruding contact 322 .

Also, referring to FIG. 15 , the second state is formed when the protruding contact 322 and the low runner 330 are spaced apart. An arc is generated at the final separation site.

In a state where the protruding contact 322 is not provided, an arc is generated through the first arc generating region A.A1. However, in the first state of the trip state, the protruding contact 322 maintains contact with the low runner 330 and the movable contact 321 and the fixed contact 311 are spaced apart, so the first state changes to the second state When doing so, the final separation part becomes the low runner 330 and the protruding contact point 322.

Therefore, when the protruding contact point 322 is not provided, the arc generated in the first arc generating region A.A1 is a second arc by the protruding contact point 322 and the low runner 330 having the above-described features. It is generated in the generation area (A.A2).

An embodiment of the present invention has an effect of moving an arc generation position upward by providing the low runner 330 and the protruding contact point 322 . That is, according to an embodiment of the present invention, an area where an arc is generated is moved upward by a distance at which the protruding contact 322 protrudes upward from the movable contact 321 .

In other words, in the blocking unit having the protruding contact 322 and the low runner 330 according to an embodiment of the present invention, the arc generating region is between the movable contact 321 and the fixed contact 311 (first arc generating region). area A.A1) between the protruding contact 322 and the low runner 330 (the first arc generating area A.A2), so that the arc extinguishing part 600, that is, close to the grid 620 are moved

The present invention is a protruding contact 322 and a low runner 330 contacted in a state in which the fixed contact 311 and the movable contact 321 are spaced apart in the trip state first state and the protruding contact 322 spaced apart in the second state And by having the low runner 330, the arc generated when the small current interruption occurs in the DC air circuit breaker is generated closer to the grid 620. Since the distance between the generated arc and the grid 620 is shortened, the time for the arc to be applied to the grid 620 is shortened, so the arc can be quickly extinguished.

5. U assembly (400)

An air circuit breaker according to an embodiment of the present invention further includes a U assembly 400.

Referring to FIG. 22 and the like, the U assembly 400 is disposed between the low runner 330 and the fixed contact point 310 .

Referring to FIG. 23 , the fixed contact stand 310 includes a base 310a on which the fixed contact 311 is disposed, and a vertical portion 310b extending upward from the base 310a. A row runner 330 may be disposed on the base 310a. A coupling hole 331 through which a coupling member coupling the fixing portion 430 and the fixed contact point 310 can pass may be formed at an end side of the row runner 330 . A plurality of opening holes 310b1 communicating with the outside may be formed in the vertical portion 310b.

The U assembly 400 extends between the arc extinguishing portion 600 and the protruding contact 322 . That is, the U assembly 400 moves away from the fixed contact point 310 side and extends toward the movable contact point 321 side. The U assembly 400 may extend between the second protection units 690 that are spaced apart from each other.

Specifically, the U assembly 400 extends between the arc extinguishing unit 600 and the movable contact stand 320 or between the arc extinguishing unit 600 and the protruding contact 322 in the trip state. That is, the U assembly 400 extends between the arc extinguishing unit 600 and the protruding contact point 322 on both sides of the row runner 330 . The U assembly 400 may extend to surround a side surface of the protruding contact 322 when the protruding contact 322 is in a tripped state.

Between the U assembly 400 and the protruding contact 322, an air gap (A.G), which is spaced apart, may be formed.

(U Assembly - Insulator)

Referring to FIG. 23, the U assembly 400 is inserted between the low runner 330 and the fixed contact stand 310, and the holder 410 protrudes from both sides of the low runner 330, and the holder 410 It does not separate from the fixed contact point 310 and includes a fixing part 430 coupled to the holder 410 and the fixed contact point 310 on the upper side of the holder 410 .

The holder 410 is inserted between the row runner 330 and the fixed contact point 310, has a space formed therein, and protrudes from both sides of the row runner 330.

The holder 410 includes a body 411 . The body 411 is spaced apart from each other on both sides and protrudes in parallel. The above-described protruding contact point 322 may move between the intervals of the body 411 . Thus, an arc may be generated in the spaced portion of the main body 411 . However, the main body 411 may be extended so as to be farther away or closer to each other.

The main body 411 is formed to surround the second part 692 of the second protection part 690 . Specifically, referring to FIG. 24 , the main body 411 is formed to surround the second portion 692 of the second protection unit 690 from the protruding contact point 322 .

Meanwhile, in another embodiment, the U assembly 400 may be provided, but the first protection part 680 and the second protection part 690 surrounding the grid leg 621 may not be provided. In this case, the body 411 of the U assembly 400 may be formed to surround the side of the grid leg 621 .

Side wings 411d may protrude outside the main body 411 . The side wing portion 411d may protect the second portion 692 of the second protection portion 690 from the rotating movable contact point 320 .

Meanwhile, in another embodiment, the U assembly 400 may be provided, but the first protection part 680 and the second protection part 690 surrounding the grid leg 621 may not be provided. In this case, the side wing portion 411d may be formed to protect the lower surface of the grid leg 621 .

Meanwhile, an air gap A.G may be formed between the main body 411 of the holder 410 and the protruding contact 322 . Specifically, as shown in FIG. 24 , an air gap A.G is formed between the body 411 of the holder 410 and the protruding contact 322 . In this case, the air gap A.G may be narrower than the air gap A.G between the second protection unit 690 and the protruding contact 322 in the above-described embodiment.

A coupling protrusion 413 may protrude from the central surface of the body 411 on the rear surface of the body 411, that is, on the side where the body 411 is close to the fixed contact point 310. The coupling protrusion 413 may be coupled to the coupling groove 433 of the fixing part 430 to couple the holder 410 and the fixing part 430 .

A fixing part 430 may be provided between the row runner 330 and the fixed contact point 310 . Since the fixing part 430 is provided, the holder 410 can be stably coupled to the fixed contact point 310 .

The fixing part 430 may include a first fixing part 431 and a second fixing part 432 .

Specifically, the first fixing part 431 may contact the fixed contact point 310 and have a width corresponding to the width of the fixed contact point 310 . Specifically, as shown in FIG. 23 , the width of the fixed contact point 310 and the width of the first fixing part 431 may be the same or formed to be the same. Through this, movement of the first fixing part 431 in the left-right direction with respect to the fixed contact point 310 can be reduced. In addition, the first fixing part 431 can easily absorb the shock received by the row runner 330 .

Also, the first fixing part 431 may be formed to surround the lower side of the row runner 330 .

The second fixing part 432 may be interposed between the first fixing part 431 and the row runner 330 . Also, the second fixing part 432 may be formed to surround the upper side of the row runner 330 .

As the second fixing part 432 is formed to surround the upper part of the low runner 330, as described above, the low runner 330 is shocked by contact and separation from the protruding contact point 322 or an arc is generated. An impact received by being applied may be absorbed by the second fixing part 432 .

A concave portion 4321 may be formed in the second fixing portion 432 to surround an upper portion of the row runner 330 .

Specifically, referring to FIG. 23 , the second fixing part 432 includes a concave part 4321 into which the low runner 330 protruding from the fixed contact bar 310 at a predetermined angle can be inserted.

At this time, one surface forming the concave portion 4321 has a contact surface 4322 in contact with a surface where the upper part of the row runner 330 faces the fixed contact point 310. And, a side surface 4323 formed perpendicularly to the contact surface 4322 may be formed. A coupling hole 432a opened for coupling with the row runner 330 and the fixed contact stand 310 may be formed in the contact surface 4322 .

The second fixing part 432 is formed with a coupling groove 433 capable of fixing the fixing part 430 to the holder 410 by being coupled with the above-described coupling protrusion 413 of the main body 411 .

The fixing part 430 may include a gassing material that generates molecules that extinguish the arc when heat generated by the arc is applied.

The gassing material generates molecules capable of extinguishing the arc as the arc is applied. Accordingly, the generated arc can be quickly extinguished.

Specifically, the gassing material emits molecules capable of extinguishing the arc when heat generated by the arc is applied. In other words, the gassing material may generate gases capable of extinguishing the arc. Through this, the arc generated in the arc extinguishing unit 600 can be quickly extinguished.

As the fixing part 430 is inserted between the fixed contact point 310 and the low runner 330, the fixed contact point 310 is disposed on the rear surface and the low runner 330 is disposed on the front surface.

As described above, the low runner 330 may generate an arc through contact with and separation from the protruding contact point 322 . Also, the generated arc may be applied to the row runner 330 . Thus, the row runner 330 may be damaged upon application of an arc.

In this case, since the fixing part 430 includes the gassing material, damage to the row runner 330 may be reduced by rapidly extinguishing the arc.

The blocking unit 300 according to an embodiment of the present invention includes a fixing unit 430 interposed between the fixed contact point 310 and the low runner 330, thereby preventing the low runner 330 from receiving external force. Shaking or changing position can be prevented.

In addition, since the fixing part 430 includes a gassing material, when an arc is applied to the low runner 330, there is an advantage in that it can quickly extinguish the fire.

6. Grid, first protection part 680 and second protection part 690

Grid 620 may include grid legs 621 . The grid leg 621 may include a grid leg 621 that extends from at least one end in the width direction and extends downward to surround the protruding contact point 322 from both sides.

Specifically, referring to FIG. 7 , grid legs 621 extend downward from both ends of the grid 620 . In other words, the grid legs 621 extend from both ends of the grid 620 toward the movable contact point 320 . That is, the first grid leg 621a and the second grid leg 621b may extend downward from both sides of the protruding contact point 322 to surround the protruding contact point 322 .

Through the above structure, a magnetic field induced by an arc formed between the protruding contact point 322 and the row runner 330 may be easily formed in the grid 620 and the grid leg 621 .

In addition, according to one embodiment of the present invention, the grid leg 621 extending adjacent to the end of the side plate 610 may serve as a conventional arc guide. That is, the arc generated at the bottom of the arc extinguishing unit 600 can be easily applied to the grid leg 621 extending to the end of the side plate 610 and applied to the top of the grid 620 to be extinguished.

Referring to FIG. 8 , the grid leg 621 includes a first grid leg 621a extending from one end of the grid 620 in the width direction and a second grid leg extending from the opposite side of the first grid leg 621a ( 621b). In this case, the first grid leg 621a and the second grid leg 621b may have the same width. In addition, grid leg grooves 622 may be formed between the grid legs 621 .

According to an embodiment of the present invention, since the first grid leg 621a and the second grid leg 621b have the same width, the induced magnetic field can be stably formed.

In addition, the arc may be applied along the first grid leg 621a and/or the second grid leg 621b to quickly extinguish the arc regardless of the position of the arc generated under the arc extinguishing unit 600 .

The grid legs 621 extend downward along the side plate 610 . Specifically, the grid leg 621 extends adjacent to the lower end of the side plate 610 .

Accordingly, since the physical distance to the arc generated in the arc generation area A.A becomes closer, the arc can be easily applied. Thus, the arc can be quickly extinguished.

In addition, when the first protection unit 680 and the second protection unit 690 are not provided, an air gap A.G, which is a space separated from each other, may be formed between the grid leg 621 and the protruding contact 322. .

The sum of lengths d1 of the first grid leg 621a and the second grid leg 621b in the width direction may be equal to or greater than half of the width of the grid 620 .

A magnetic field may be induced in the grid leg 621 and the grid 620 by an arc generated under the arc extinguishing unit 600 . At this time, the strength of the magnetic field induced in the grid 620 and the grid leg 621 is in inverse proportion to the distance between the arc and the grid leg 621 .

Accordingly, when the width of the grid leg 621 is small, the distance between the relatively generated arc and the air gap A.G, which is the distance between the generated arc and the grid leg 621, is increased. Accordingly, the intensity of the magnetic field induced in the grid 620 and the grid leg 621 is relatively weak. Accordingly, the electromagnetic force applied to the arc by the magnetic field induced in the grid 620 is relatively weak.

In the present invention, the sum of the lengths of the first grid leg 621a and the second grid leg 621b in the width direction is formed to be more than half of the width of the grid 620, so that the protrusion occurs between the contact point 322 and the row runner. A more powerful induced magnetic field by the arc may be formed.

The length of the first grid leg 621a and the second grid leg 621b in the width direction of the upper part and the length of the lower part in the width direction may be the same or similar.

Specifically, referring to FIG. 17 , the lengths of the upper portions of the first grid leg 621a and the second grid leg 621b in the width direction are equal to or similar to the lengths of the lower portions in the width direction of the first grid leg 621a and the second grid leg 621b. 621a and a second grid leg 621b extend from the top.

If the width of the first grid leg 621a and the second grid leg 621b extends downward from the grid 620 and changes, it occurs between the first grid leg 621a and the second grid leg 621b. It is difficult to form a uniform magnetic field induced in the first grid leg 621a and the second grid leg 621b by the arc.

Therefore, through the structure of the first grid leg 621a and the second grid leg 621b as described above, the induced magnetic field formed through the grid leg 621 and the grid 620 can be stably formed. .

The first grid leg 621a and the second grid leg 621b are wider than the length of the air gap A.G, which is the distance between the first grid leg 621a or the second grid leg 621b and the protruding contact point 322. It can be made to have a width.

Specifically, referring to FIG. 17 , the width d1 of the first grid leg 621a is longer than the length of the air gap A.G, which is the distance between the first grid leg 621a and the protruding contact 322. do. At this time, the first protection unit 680 and the second protection unit 690 are not shown in FIG. 17 . Also, according to embodiments, the first protection unit 680 and/or the second protection unit 690 may not be provided.

Through the above structure, the intensity of the magnetic field induced in the grid 620 and the grid leg 621 may be increased.

Specifically, the intensity of the magnetic field of the grid leg 621 and the grid 620 induced by the arc is in inverse proportion to the distance between the protruding contact point 322 and the grid leg 621, that is, the length of the air gap A.G. is formed Also, when the width of the grid leg 621 is widened, the length of the air gap (A.G) is relatively reduced.

Accordingly, when the width d1 of the grid leg 621 is longer than the length of the air gap A.G, the strength of the magnetic field induced in the grid leg 621 may increase.

In addition, according to the structure described above, since the length of the air gap A.G is short, the pressure applied to the generated arc may increase. Accordingly, the lifting force of the arc can also be increased.

The ratio (d1/d2) of the width (d1) of the grid leg 621 and the length (d2) of the air gap (A.G) is as follows.

According to an embodiment of the present invention, the ratio (d1/d2) of the width d1 of the first grid leg 621a or the second grid leg 621b to the length d2 of the air gap A.G is 1 may be ideal

Specifically, referring to FIG. 17 , the ratio (d1/d2) of the width d1 of the first grid leg 621a or the second grid leg 621b to the length d2 of the air gap A.G is 1. may be ideal

When the ratio (d1/d2) of the width d1 of the first grid leg 621a or the second grid leg 621b and the length d2 of the air gap A.G is smaller than 1, the grid 620 and The intensity of the magnetic field induced in the grid leg 621 is weak, and the length of the air gap A.G is large, so the pressure applied to the arc may not be sufficient.

Therefore, the electromagnetic force by the magnetic field induced by the grid leg 621 and the pressure in the area where the arc is generated are strong enough to raise the arc generated under the arc extinguishing unit 600 to the arc extinguishing unit 600. may not be authorized.

In the grid leg 621 according to an embodiment of the present invention, the ratio d1 of the width d1 of the first grid leg 621a or the second grid leg 621b and the length d2 of the air gap A.G. /d2) may consist of 1 or more, so that the arc generated by the magnetic field induced in the grid leg 621 may have sufficient strength to be applied to the arc extinguishing unit 600 by the electromagnetic force.

In addition, in the grid leg 621 according to an embodiment of the present invention, the ratio of the width d1 of the first grid leg 621a or the second grid leg 621b to the length d2 of the air gap A.G. (d1/d2) is made up of 1 or more, so that the air gap (A.G) between the grid leg 621 and the protruding contact 322 is formed short, and the generated arc is sufficient to rise to the arc extinguishing unit 600. pressure can be built up.

First protection unit 680

Referring to FIGS. 6 to 11 , the grid leg 621 may extend downward to surround the protruding contact point 322 extending upwardly from the movable contact point 321 from both sides.

The first protection part 680 is formed to surround at least a part of the grid leg 621 at the bottom of the grid leg 621 . Specifically, referring to FIGS. 6 and 7 , the first protection part 680 is formed below the grid leg 621 to surround the grid leg 621 .

The first protection part 680 may be formed long along the longitudinal direction of the side plate 610 . That is, the first protection part 680 is formed to surround the grid leg 621 and extends in a section corresponding to a section in which the movable contact band 320 is moved.

The first protection part 680 may be formed to be long along the longitudinal direction of the side plate 610 so as to cover the entirety of the grid legs 621 of the plurality of grids 620 . However, in another embodiment, the first protection part 680 may be formed to cover only some of the grid legs 621 of the plurality of grids 620 .

The first protection unit 680 is provided in plurality. Specifically, two first protection units 680 may be provided so as to be respectively disposed on the side plates 610 disposed on both sides. However, in another embodiment, the first protector 680 may be segmented in the longitudinal direction and connected to three or more.

The first protection parts 680 may be disposed on the side plates 610 disposed to face each other so as to face each other. In addition, the first protection unit 680 may be coupled to and fixed to the side plate 610 disposed adjacent thereto.

The first protection part 680 extends at a predetermined angle with the first surface 681a surrounding the lower surface of the grid leg 621 and the first surface 681a, and the grid leg 621 is disposed on the other side. A second surface 681b surrounding the side facing the grid leg 621 may be included.

Specifically, the first protection unit 680 includes a body 681 elongated along the longitudinal direction of the side plate 610 .

The body 681 includes a first surface 681a covering the lower surface of the grid leg 621 and a second surface 681b covering the side surface of the grid leg 621 . The first surface 681a is formed to cover the lower surface of the grid leg 621 . The second surface 681b is formed to surround the side surface of the grid leg 621 .

Due to the first surface 681a and the second surface 681b, the grid legs 621 are separated from the protruding contacts 322 and the low runners 330, and damage to the grid legs 621 due to arcs generated is reduced. It can be.

In addition, since the first protection unit 680 is covered by a second protection unit 690 to be described later, damage to the first protection unit 680 due to the generated arc can be reduced. Accordingly, the grid leg may be primarily protected by the second protection unit 690 and secondarily protected by the first protection unit 680 . Also, the first protection unit 680 may be protected by the second protection unit 690 .

The first protection part 680 is disposed spaced apart from each other along the longitudinal direction so that the grid legs 621 respectively formed in the plurality of grids 620 are inserted, and the grid legs 621 are formed to be inserted. An insertion groove 682 may be formed.

In detail, an insertion groove 682 into which the grid leg 621 can be inserted may be formed in the body 681 of the first protection unit 680 .

The insertion groove 682 is formed concavely into the body 681 so that the grid leg 621 extending from the grid 620 can be inserted. Referring to FIGS. 6 and 8 , the insertion groove 682 may be inserted into most of the grid leg 621 in the longitudinal direction.

The insertion groove 682 may be formed obliquely so that the grid leg 621 can be inserted at an angle formed with respect to the side plate 610 according to the arrangement direction of the grid 620 . In addition, the insertion groove 682 may be made such that the grid leg 626 of the outermost grid 625 can also be inserted.

Meanwhile, the first protector 680 may further include an outermost insertion groove 682a for accommodating the grid legs of the outermost grid 625 .

At this time, the width of the grid leg 626 of the outermost grid 625 may be narrower than the width of the grid leg 621 of the other grid 620, and the width of the outermost insertion groove 682a is the outermost grid It may be formed to correspond to the width of the grid leg 626 of 625 . That is, the width of the outermost insertion groove 682a may be shorter than that of the other insertion grooves 682 .

Meanwhile, a concave area 681c may be formed in the first protection unit 680 . Specifically, referring to FIG. 7 , the first protection unit 680 is recessed in the direction toward the protruding contact point 322 of the outermost insertion groove 682a disposed in the direction toward the fixed contact point 311 and is concave. A region 681c may be formed.

All of the grid legs 621 of the plurality of grids 620 are inserted into the insertion groove 682, and at the same time, the first protection part 680 is coupled to the side plate 610, so that an arc is applied to the grid 620. Separation of the grid 620 from the side plate 610 due to an impact may be reduced.

An air gap A.G may be formed between the second protection units 690 and the protruding contact point 322 , which are spaced apart to face each other.

Specifically, referring to (a) of FIG. 11 , an air gap A.G is formed between the second protection unit 690 and the protruding contact 322 .

In this case, the length of the air gap A.G is the distance between the second protection unit 690 and the protruding contact point 322 . At this time, compared to the case where the second protection unit 690 is not provided, the length of the air gap A.G is formed short.

That is, as the second protector 690 is disposed, the length of the air gap A.G between the existing grid leg 621 and the protruding contact 322 or the existing first protector 680 and the protruding contact ( 322), the length of the air gap A.G between the second protection part 690 and the protruding contact 322 is shorter.

Through this, the space in which the arc is generated is reduced, and the pressure generated due to the generation of the arc increases, thereby increasing the lifting force for the generated arc to rise.

On the other hand, the first protection part 680 protrudes from the bottom of the arc runner 650 and has a recess region in which coupling grooves 684a and 684b into which a coupling member for coupling with the side plate 610 can be inserted are formed ( 683) may be further included.

Referring to FIGS. 7 and 21 , the recess region 683 is concave inward from the lower side of the arc runner 650 .

In the recess area 683, the third part 693 and the fifth part 695 of the second protection part 690 are formed in the first protection part 680 by the side plate 610 and the first protection part 680. It may be formed concave inward to be inserted between them.

In the recess area 683, the third part 693 and the fifth part 695 of the second protection part 690 are inserted without a step between the side plate 610 and the first protection part 680. formed so that That is, due to the recess region 683, the first protection unit 680, the second protection unit 690, and the side plate 610 may be coupled to each other without a step in the longitudinal direction.

According to one embodiment of the present invention, the first protection part 680 surrounds the plurality of grid legs 621 and is coupled to the side plate 610 to protect the grid legs 621 from arcs generated, and the grid 620 It is possible to further reduce the separation of the grid 620 from the side plate 610 when an arc is applied to ).

Second protection unit 690

The second protection unit 690 is disposed under the first protection unit 680 and is formed to cover at least a portion of an area where the first protection unit 680 is exposed to the outside.

Specifically, referring to FIG. 7 , the second protection unit 690 is disposed below the first protection unit 680 to surround two surfaces of the first protection unit 680 that are bent to each other. Accordingly, an area of the first protection unit 680 exposed to the outside from inside the arc extinguishing unit 600 can be minimized. Specifically, the first protection unit 680 may not be exposed to the outside along a path through which the protruding contact point 322 passes. As the first protection unit 680 is surrounded by the second protection unit 690 , deterioration of the first protection unit 680 by an arc or impact caused by an arc may be reduced.

The second protection unit 690 may be disposed between the first protection unit 680 and the protruding contact 322 . Specifically, referring to FIG. 11 , the second protection unit 690 is disposed between the first protection unit 680 and the protruding contact 322 . That is, the inner surface of the second protection unit 690 is disposed in contact with the first protection unit 680 , and the outer surface of the second protection unit 690 is disposed apart from the protruding contact point 322 .

The second protection part 690 may be formed long along the longitudinal direction of the side plate 610 and enclosing the first protection part 680 . Accordingly, it may be formed to cover the entire longitudinal direction of the first protection unit 680 disposed below the arc extinguishing unit 600 . However, in another embodiment, the second protection unit 690 may be formed to cover only a part of the first protection unit 680 .

The second protection unit 690 is formed to surround the first protection unit 680 on at least two surfaces, so that the protruding contact point 322 passes under the arc extinguishing unit 600 and an arc can be generated. The first protection unit 680 may be protected in a lower area of the unit 600 .

As shown in FIG. 7 , a plurality of second protection units 690 may be provided, and each may be coupled to the side plate 610 to surround the first protection units 680 facing each other.

Hereinafter, a detailed structure of the second protection unit 690 will be described.

The second protection part 690 extends by bending the first part 691 formed to cover the first surface 681a of the first protection part 680 and the first part 691, A second portion 692 formed to cover the second surface 681b of the portion 680 is included.

The first portion 691 may cover the first surface 681a, which is the lower surface of the first protection unit 680. In addition, as shown in FIG. 7 , a recessed portion 691a concavely formed according to the shape of the side plate 610 is provided on the rear side of the first protection unit 680, that is, on the far side from the fixed contact 311. can be formed As the recess portion 691a is formed in the first protection portion 680, the lower portion of the arc extinguishing portion 600 may be slimmed down. Accordingly, when the arc extinguishing unit 600 is inserted into the blocking portion, it is possible to prevent the lower end of the arc extinguishing unit 600 from being caught.

The second part 692 may be formed to surround surfaces of the first protection part 680 facing each other. Accordingly, the second portion 692 may prevent an arc generated when the protruding contact 322 passes under the arc extinguishing unit 600 from contacting the first protection unit 680 .

Also, the second protection unit 690 may include a third part 693 to a fifth part 695 .

Specifically, the third portion 693 is bent with the first portion 691 and extends between the first protection portion 680 and the side plate 610 to be combined with the first protection portion 680 and the side plate 610. can

The fourth part 694 is bent and extended with the second part 692 and may be formed to surround a direction away from the fixed contact 311 of the first protection part 680 . The fourth portion 694 may be formed to surround the rear surface (a surface far from the fixed contact 311 ) of the first protection unit 680 .

The fifth part 695 is bent and extended with the fourth part 694, and may extend between the first protection part 680 and the side plate 610 and be combined with the first protection part 680 and the side plate 610. there is.

The third part 693 and the fifth part 695 may be inserted into the recess area 683 of the first protection part 680 . Specifically, referring to FIG. 7 , the third part 693 and the fifth part 695 are inserted into the concave recess area 683 formed in the first protection part 680, so that the first protection part ( 680), the second protection unit 690, and the side plate 610 may not have a step difference.

In addition, coupling holes 693a and 695a may be formed in the third portion 693 and the fifth portion 695 so that a coupling member inserted from the outside of the side plate 610 is inserted. Accordingly, the coupling member penetrating the side plate 610 from the outside of the side plate 610 passes through the coupling hole 693a of the third portion 693 and the coupling hole 695a of the fifth portion 695 .

And, the coupling member passing through the coupling hole 693a of the third portion 693 and the coupling hole 695a of the fifth portion 695 is connected to the coupling grooves 684a and 684b formed in the first protection part 680. are combined

Coupling holes 693a and 695a are formed in the third part 693 and the fifth part 695, and the coupling holes 693a and 695a are coupled from the outside of the side plate 610 of the arc extinguishing unit 600 The coupling member is penetrated, and the through coupling member is coupled to the coupling grooves 684a and 684b formed in the first protection unit 680, so that the side plate 610 of the arc extinguishing unit 600 and the second protection unit 690 And there is an effect that the first protection unit 680 can be firmly coupled to each other.

The second protector 690 may include a gassing material that generates molecules that extinguish the arc when the movable contact and the fixed contact 311 are spaced apart and heat generated by the generated arc is applied. there is.

The gassing material generates molecules capable of extinguishing the arc as the arc is applied. Accordingly, the generated arc can be quickly extinguished.

Specifically, when heat generated by an arc is applied to the gassing material, molecules capable of extinguishing the arc are released. In other words, the gassing material can generate gases that can extinguish the arc. Through this, the arc generated in the arc extinguishing unit 600 can be quickly extinguished.

In this case, since the second protection unit 690 includes the gassing material, the arc can be quickly extinguished and damage to the first protection unit 680 can be reduced.

In addition, the second protection unit 690 forms an air gap (A.G) between the protruding contact 322 and the second protection unit 690, thereby increasing the pressure in the space where the arc is generated, thereby generating a lifting force on the generated arc. this may increase

outermost grid (625)

Referring to FIG. 7 , an outermost grid 625 having a relatively short length and width of a grid leg may be included. The outermost grid 625 is a grid disposed closest to the fixed contact 311 among a plurality of grids.

Since the width of the outermost grid 625 is shorter than other grids, the space or arc required for contact and separation of the fixed contact band 310 and the movable contact band 320 disposed adjacent to the outermost grid 625 It is possible to secure the space necessary for arranging various configurations for inducing.

Grid legs 626 may also be provided on the outermost grid 625 . The grid leg 626 of the outermost grid 625 may be shorter than the grid leg 621 of the grid 620 . Also, the grid leg 626 of the outermost grid 625 may be narrower than the other grid legs 621 .

7. Description of arc induction path (A.P) by magnetic field

Referring to the drawings, the magnetic field formed in the blocking unit 300, the electromagnetic force applied to the arc, and the arc induction path A.P will be described as follows.

로 표시된 부분은 전류(아크)가 지면(paper)에서 나오는 방향으로 흐름을 의미한다. 또한, "?quot;로 표시된 부분은 전류(아크)가 지면(paper)을 향해 들어가는 방향으로 흐름을 의미한다.In the description below, "

The part marked with means that the current (arc) flows in the direction coming out of the paper. In addition, the part marked with "?quot; means the flow in the direction in which the current (arc) enters toward the paper.

DC air circuit breaker 10 according to an embodiment of the present invention is for direct current flowing from a movable contact 321 (protruding contact 322) to a fixed contact 311 (low runner 330) or vice versa. blocking is made Therefore, the arc generated when tripped is also formed in the same direction as the energized direction.

Referring to FIG. 17, in a trip state in which the fixed contact 311 and the movable contact 321 are spaced apart, the arc generated in the space between the low runner 330 and the protruding contact 322 and the space below the grid 620 A magnetic field area M.F.A to which electromagnetic force is applied is formed.

The magnetic field area M.F.A may include a magnetic field formed by a magnetic field by a permanent magnet and a ferromagnetic material (grid leg 621) disposed around an arc generating area.

For example, a ferromagnetic material disposed around a region where an arc is generated may be induced to form a magnetic field in a direction that opposes a magnetic field caused by a current of the generated arc. This can be referred to as the induced magnetic field of ferromagnets.

The arc may receive an electromagnetic force due to a Lorentz force due to a magnetic field generated by a permanent magnet or an induced magnetic field generated by a ferromagnet.

The direction of the electromagnetic force received by the generated arc can be explained by Fleming's left-hand rule. Fleming's left hand rule states that if the third finger points in the direction of current (I) and the second finger points in the direction of magnetic field (B), the direction of the thumb is in the direction of electromagnetic force (F). Here, the angle between each finger should be a right angle.

At this time, according to Fleming's left hand rule, the arc may move along the direction of the electromagnetic force received by the arc. This motion of the arc may be referred to as an arc-guided path (A.P.).

Arc induction path by grid legs (A.P)

Referring to FIG. 18, a magnetic field is induced in the grid leg 621 by an arc generated under the arc extinguishing unit 600, and an electromagnetic force is applied to the generated arc by the magnetic field induced in the grid leg 621. It is a drawing for explaining. At this time, in the drawing, the first protection unit 680 and the second protection unit 690 are not shown for convenience of explanation.

Referring to FIG. 18 , the direction of the arc current generated when the air circuit breaker 10 trips flows from the movable contact 321 (protruding contact 322) to the fixed contact 311 (low runner 330). That is, a current (arc) is formed in a direction entering toward the paper.

At this time, considering the current direction of the arc, the magnetic field B1 is formed in a direction surrounding the arc generated by Ampere's right-hand screw rule, that is, in a clockwise direction based on the drawing.

A magnetic field B2 induced in a direction obstructing the magnetic field B1 generated by the arc is generated in the grid leg 621 . In this case, the first grid leg 621a may be instantaneously magnetized to the N pole, and the second grid leg 621b may be magnetized to the S pole.

And, by the induced magnetic field B2, the arc receives the electromagnetic force F toward the arc extinguishing part 600, that is, the upper side according to Fleming's left hand rule. At this time, the arc induction path (A.P) becomes the upper side as the direction of the electromagnetic force (F), and thus the generated arc can be quickly applied to the grid 620.

Referring to FIG. 19 , the direction of the arc current generated when the air circuit breaker 10 trips flows from the fixed contact 311 (low runner 330) to the movable contact 321 (protruding contact 322). That is, a current (arc) is formed in a direction coming out of the paper.

At this time, considering the current direction of the arc, the magnetic field B1 is formed in a direction surrounding the arc generated by Ampere's right-hand screw rule, that is, in a counterclockwise direction based on the drawing.

A magnetic field B2 induced in a direction obstructing the magnetic field B1 generated by the arc is generated in the grid leg 621 . In this case, the second grid leg 621b may be instantaneously magnetized to the N pole, and the first grid leg 621a may be magnetized to the S pole.

By the magnetic field B2 induced in the grid leg 621, the arc receives the electromagnetic force F toward the arc extinguishing part 600, that is, the upper side according to Fleming's left hand rule. At this time, the arc induction path (A.P) becomes the upper side as the direction of the electromagnetic force (F), and thus the generated arc can be quickly applied to the grid 620.

The arc extinguishing unit 600 according to an embodiment of the present invention, the blocking unit, and the air circuit breaker 10 including the same include an arc induction path ( A.P) is formed toward the top regardless of the direction of the current. Accordingly, an arc may be applied toward the grid 620 and extinguished more quickly.

Arc induction path (A.P) in the embodiment in which the first protection unit and the second protection unit are disposed

Referring to FIG. 11, a magnetic field is induced in the grid leg 621 by an arc generated under the arc extinguishing unit 600, and an electromagnetic force is applied to the generated arc by the magnetic field induced in the grid leg 621. It is a drawing for explaining.

Referring to (b) of FIG. 11, the direction of the arc current generated when the air circuit breaker 10 trips is from the movable contact 321 (protruding contact 322) to the fixed contact 311 (low runner 330). ) flows towards That is, a current (arc) is formed in a direction entering toward the paper.

At this time, considering the current direction of the arc, the magnetic field B1 is formed in a direction surrounding the arc generated by Ampere's right-hand screw rule, that is, in a clockwise direction based on the drawing.

A magnetic field B2 induced in a direction obstructing the magnetic field B1 generated by the arc is generated in the grid leg 621 . In this case, the first grid leg 621a may be instantaneously magnetized to the N pole, and the second grid leg 621b may be magnetized to the S pole.

And, by the induced magnetic field B2, the arc receives the electromagnetic force F2 toward the arc extinguishing part 600, that is, the upper side according to Fleming's left hand rule. At this time, the arc induction path (A.P) becomes the upper side as the direction of the electromagnetic force (F), and thus the generated arc can be quickly applied to the grid 620.

As the electromagnetic force is applied to the arc to move along the arc induction path A.P, the arc may be applied toward the grid 620 or the grid leg 621 of the arc extinguishing unit 600 .

In addition, as described above, by forming an air gap (A.G) between the protruding contact 322 and the second protection unit 690, the pressure applied to the generated arc increases, so that the arc moves toward the arc extinguishing unit 600. There is a force to rise.

Therefore, the force applied to the arc is the electromagnetic force F2 due to the magnetic field induced in the grid leg 621 and the rising force due to the pressure caused by the air gap A.G. Accordingly, the arc can be more easily applied to the arc extinguishing unit 600 and the grid 620 .

According to an embodiment of the present invention, the electromagnetic force received by the arc is directed upward by the magnetic field induced by the grid leg 621 regardless of the direction of the current of the arc generated during tripping. Accordingly, as the arc is applied to the grid 620, the arc can be quickly extinguished.

Furthermore, according to an embodiment of the present invention, the space where the arc generated during the trip is further reduced by the first protection unit 680 and the second protection unit 690, so that the pressure applied to the generated arc is reduced. will increase

Therefore, the arc can be applied to the grid 620 more quickly by adding the electromagnetic force by the magnetic field and the rising force by the pressure.

In an embodiment further comprising a U assembly, the arc guide path (A.P.)

Meanwhile, FIG. 27 shows the electromagnetic force applied to the arc and the arc induction path (A.P) when the U assembly 400 is further included. 27(b) is a case in which an arc is formed in a direction going into the ground.

Therefore, referring to FIG. 27, a magnetic field and an electromagnetic force are formed in the same direction as that of FIG. 11 described above. That is, the electromagnetic force formed in the arc and the arc induction path A.P are formed toward the upper right side.

However, in the embodiment shown in FIG. 27, the air gap A.G between the protruding contact 322 and the U assembly 400 is between the protruding contact 322 and the second protection unit 690 in FIG. 11 described above. It is formed shorter than the air gap (A.G).

Accordingly, in the arc formed in the embodiment of FIG. 27 , a greater pressure may be formed in the space where the arc is generated than in the above-described embodiment of FIG. 11 . Accordingly, the upward force of the arc may be increased.

8. Air gap (A.G) and upward force of the arc

In one embodiment of the present invention, the protruding contact 322 may protrude from an upper side of the centrally disposed movable contact 321 among the plurality of movable contacts 321 .

An air gap (A.G) may be formed between the protruding contact 322 and the second protection unit 690 or the U assembly 400 in various embodiments of the present invention.

Air gap (A.G) in relation to the second protection unit 690

In one embodiment, the protruding contact 322 is disposed to be surrounded by the first protection part 680 and the second protection part 690 surrounding the grid leg 621 .

Specifically, referring to FIG. 11 , an air gap A.G is formed between the protruding contact 322 and one side surface of the second protection unit 690 surrounding the first protection unit 680 . At this time, the length of the air gap (A.G) is equal to the length of the grid leg 621 and the protruding contact 322 in the above-described embodiment in which the second protection unit 690 is not provided and only the first protection unit 680 is provided. It may be shorter than the length of the air gap (A.G) formed between the.

That is, as the length of the air gap A.G is shortened, the pressure applied to the generated arc may be increased. Accordingly, the upward force for the generated arc to rise may be greater.

Air gap (A.G) in relation to U assembly 400

In another embodiment, the protruding contact point 322 may be arranged to be wrapped by the U assembly 400 disposed inside the grid leg 621 .

Specifically, referring to FIG. 27 , an air gap A.G may be formed between the protruding contact 322 and the holder 410 of the U assembly 400 . At this time, the U assembly 400 disposed inside the grid legs 621 extending below the grid 620, the first protection part 680 and the second protection part 690 surrounding the grid legs 621 A holder 410 is placed.

Accordingly, the length of the air gap A.G between the holder 410 of the U assembly 400 and the protruding contact 322 may be shorter than the length of the air gap A.G of the other embodiments described above. Accordingly, as the length of the air gap A.G is shortened, the pressure applied to the generated arc may be increased. Accordingly, the upward force for the generated arc to rise may be greater.

The present invention forms an air gap (A.G) between the protruding contact 322 and the second protection unit 690 or the U assembly 400, thereby reducing the arc generated between the protruding contact 322 and the low runner 330. By increasing the pressure applied to the arc, a force to rise may be applied to the generated arc.

Since the air gap A.G is formed in the area where the arc is generated, the space of the arc generation area is reduced, and thus the pressure applied to the generated arc is increased, so that the generated arc can receive an upward force. Accordingly, an arc can be more easily applied to the grid 620 or the grid leg 621 and extinguished quickly.

Although described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the claims below. You will understand that there is

10: air circuit breaker
100: cover part
110: upper cover
111: first upper cover
112: second upper cover
120: lower cover
200: driving unit
210: shooter
220: crossbar
230: lever
300: blocking part
310: fixed contact point
311: fixed contact
320: movable contact point
320a: extension
321: movable contact
322: protruding contact
328: axis of rotation
330 Low Runner
500 magnet part
510 magnet
600: arc extinguishing unit
610: side plate
620: grid
621: grid legs
621a first grid leg
621b second grid leg
621a1 lower surface of the first grid leg
621a2 side of first grid leg
621b1 lower surface of the second grid leg
621b2 side of second grid leg
625 outermost grid
626 grid legs
630: grid cover
631: cover body
632: upper frame
633: mesh part
650: arc runner
680: first protection unit
681 body
681a page 1
681b page 2
682 insertion groove
682a outermost insertion groove
683 recess area
684a, 684b coupling groove
690 Second Protection Unit
691 first part
691a recess
692 second part
693 third part
693a coupling hole
694 fourth part
695 fifth part
695a coupling hole
MF (Magnetic Field): magnetic field
Arc-guided Path (AP): Arc Guided Path
AA (Arc-generation Area): Arc generation area
A.A1: first arc generation area
A.A2: Second arc generation area
MFA (Magnetic Field Area): magnetic field area

Claims (19)

Side plates spaced apart from each other and arranged to face each other;
a grid disposed between the side plates, provided in plurality, spaced apart from each other, and coupled to the side plates; and
A grid cover located above the grid and covering the grid,
The grid is
And a grid leg extending downward to surround the protruding contact extending from both sides of the movable contact and extending to the upper part of the movable contact,
a first protection part disposed under the grig leg and surrounding at least a portion of the grig leg;
Disposed below the first protection unit and including the second protection unit formed to surround at least a portion of an area exposed to the outside of the first protection unit,
arc extinguishing department.
According to claim 1,
The first protection unit,
Formed long along the longitudinal direction of the side plate,
arc extinguishing department.
According to claim 2,
The first protection unit,
It is provided in plurality and is disposed on the side plates disposed to face each other and made to face each other,
arc extinguishing department.
According to claim 3,
The second protection unit,
Along the longitudinal direction of the side plate, it is formed long and surrounds the first protector,
arc extinguishing department.
According to claim 4,
The second protection unit,
It is provided in plurality and is formed to surround each of the first protection parts formed to face each other by being coupled to the side plates, respectively.
arc extinguishing department.
According to claim 3,
The first protection unit,
a first surface covering a lower surface of the grid leg; and
A second surface extending at a predetermined angle with the first surface and covering a side surface facing a grid leg disposed on the other side of the grid leg,
arc extinguishing department.
According to claim 6,
The first protection unit,
Insertion grooves are formed in which the grid legs are spaced apart from each other along a lengthwise direction so that the grid legs respectively formed in the plurality of grids are inserted, and the grid legs are formed to be inserted.
arc extinguishing department.
According to claim 7,
The outermost grid closest to the fixed contact among the grids,
The width of the grid leg is narrower than the rest of the grid,
arc extinguishing department.
According to claim 8,
The outermost insertion groove for accommodating the grid leg of the outermost grid of the first protection unit,
It is formed to correspond to the width of the grid leg of the outermost grid,
In the first protection unit,
A concave area is formed by being recessed in a direction toward the protruding contact of the outermost insertion groove disposed in a direction toward the fixed contact,
arc extinguishing department.
According to claim 6,
The second protection unit,
a first portion configured to cover a first surface of the first protection unit;
Including a second part bent and extended with the first part and made to cover the second surface of the first protection part,
arc extinguishing department.
According to claim 10,
The second protection unit,
a third portion bent with the first portion, extending between the first protection portion and the side plate, and coupled to the first protection portion and the side plate;
a fourth portion bent and extended from the second portion and wrapped around a direction away from the fixed contact of the first protection unit; and
A fifth part bent and extended from the fourth part, extending between the first protection part and the side plate and coupled to the first protection part and the side plate,
arc extinguishing department.
According to claim 11,
In the first protection unit,
A recess region concave inwardly is formed so that the third part and the fifth part can be inserted between the side plate and the first protection part;
In the third part and the fifth part,
A coupling hole is formed so that a coupling member inserted from the outside of the side plate is inserted,
arc extinguishing department.
According to claim 4,
The second protection unit,
Including a gassing material that generates molecules that extinguish the arc when the movable contact and the fixed contact are spaced apart and the heat generated by the generated arc is applied,
arc extinguishing department.
According to claim 1,
An air gap is formed between the second protection unit and the protruding contact,
arc extinguishing department.
a fixed contact point disposed at the lower end and extending upward;
a movable contact stand including a movable contact and configured such that the movable contact moves in a direction toward the fixed contact or in a direction away from the fixed contact;
a row runner extending upwardly from the fixed contact point, one end coupled to the fixed contact point, and the other end spaced apart from the fixed contact point; and
A protruding contact disposed extending upward from the movable contact and contacting the low runner or being spaced apart from the low runner;
The protruding contact,
Both sides of the grid of the arc extinguishing unit are disposed adjacent to the first protection unit and the second protection unit surrounding the grid leg extending downward.
blocking part.
According to claim 15,
A U assembly disposed between the row runner and the fixed contact bar, away from the fixed contact bar side, extending toward the movable contact side, and wrapped around a side surface of the grid leg,
blocking part.
According to claim 16,
The first protection unit,
It is formed to surround the grid leg and extends in a section corresponding to a section in which the movable contact bar is moved,
The second protection unit,
Disposed between the first protection unit and the protruding contact,
blocking part.
According to claim 17,
The U assembly,
It is provided in plurality and extends between the second protectors formed spaced apart from each other,
arc extinguishing department.
a fixed contact point disposed at the lower end and extending upward;
a movable contact stand including a movable contact and configured such that the movable contact moves in a direction toward the fixed contact or in a direction away from the fixed contact;
a row runner extending upwardly from the fixed contact point, one end coupled to the fixed contact point, and the other end spaced apart from the fixed contact point; and
A protruding contact disposed extending upward from the movable contact and contacting the low runner or being spaced apart from the low runner;
An arc extinguishing unit positioned adjacent to the fixed contact and the movable contact and configured to extinguish an arc generated when the fixed contact and the movable contact are spaced apart,
The arc extinguishing unit,
Side plates spaced apart from each other and arranged to face each other;
a grid disposed between the side plates, provided in plurality, spaced apart from each other, and coupled to the side plates; and
A grid cover located above the grid and covering the grid,
The grid is
And a grid leg extending downward to surround the protruding contact extending from both sides of the movable contact and extending to the upper part of the movable contact,
a first protection part disposed under the grig leg and surrounding at least a portion of the grig leg;
Disposed below the first protection unit and including the second protection unit formed to surround at least a portion of an area exposed to the outside of the first protection unit,
air breaker.

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