KR20220155096A - Air circuit breaker - Google Patents

Abstract

An air circuit breaker is disclosed. The present invention provides an air circuit breaker comprising: a fixed contact; a movable contact which moves in a direction toward or away from the fixed contact; a fixed contact base in which the fixed contact is disposed at the bottom end and which extends upward; a low runner extending upwardly from the fixed contact and having one end coupled to the fixed contact and the other end spaced apart from the fixed contact; a magnet unit disposed between the low runner and the fixed contact stand, and forming a magnetic field between the fixed contact and the movable contact so as to induce a path of an arc generated when the fixed contact and the movable contact are separated to the outside; and an arc extinguishing unit including a plurality of side plates and a grid coupled between the side plates. The grid includes grid legs extending downward from both ends in the width direction so that an induced magnetic field can be formed by an arc generated when the fixed contact and the movable contact are spaced apart. An arc can be more quickly applied to the grid of the arc extinguishing unit.

Description

Air circuit breaker {Air circuit breaker}

The present invention relates to an air circuit breaker, and more particularly, to an air circuit breaker capable of effectively extinguishing an arc generated by interrupting current.

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 magnet and a ferromagnetic material forming a magnetic field associated with an arc movement path are not damaged by an arc.

Another object of the present invention is to provide an air circuit breaker having a structure that does not require excessive design changes in order to include a magnet and a ferromagnetic material that form a magnetic field associated with an arc movement path.

Another object of the present invention is to provide an air circuit breaker having a structure in which a space occupied by an arc is not excessively increased even when a magnet and a ferromagnetic material are provided to form a magnetic field related to a moving path of the arc.

In addition, one object is to provide an air circuit breaker having a structure in which an arc extinguishing path of a generated arc can be secured even when a magnet and a ferromagnetic material are provided.

In order to achieve the above object, the present invention provides a fixed contact, a movable contact that moves in a direction toward or away from the fixed contact, a fixed contact strip having the fixed contact disposed at the bottom and extending toward the top. , a low runner extending upwardly from the fixed contact, one end coupled to the fixed contact and the other end spaced apart from the fixed contact, disposed between the low runner and the fixed contact, wherein the A magnet part for forming a magnetic field between the fixed contact and the movable contact to guide the path of an arc generated when the fixed contact and the movable contact are separated to the outside, and a plurality of side plates, including a grid coupled between the side plates An arc extinguishing unit, wherein the grid includes grid legs extending downward from both ends in a width direction so that an induced magnetic field can be formed by an arc generated when the fixed contact and the movable contact are spaced apart. .

In addition, the grid leg may extend to be adjacent to an end of the side plate.

The grid leg may include a first grid leg extending from one end of the grid in a width direction and a second grid leg extending from an opposite side of the first grid leg, and The widths of the grid legs may be made the same.

In addition, a protruding contact point extending upward from the movable contact point may be further included, and the grid leg may surround the protruding contact point from both sides.

Also, the first grid leg and the second grid leg may have a width wider than a length of an air gap, which is a distance between the first grid leg or the second grid leg and the protruding contact point.

Further, the row runner may be configured such that a distance away from the fixed contact point becomes longer as it goes upward.

In addition, the shape of the magnet part may be formed to fill a space formed between the low runner and the fixed contact point.

The magnet unit may include a first surface magnetized to an N pole and a second surface magnetized to an S pole disposed on opposite surfaces to each other, and the first surface may be disposed in a direction adjacent to the fixed contact point. .

In addition, the fixed contact bar may extend upward and form a predetermined angle toward the row runner.

In addition, in a trip state in which the fixed contact and the movable contact are spaced apart, a magnetic field region in which electromagnetic force is applied to a generated arc may be formed in a space between the low runner and the movable contact and in a lower space of the grid.

In addition, a magnetic field by the magnet part and an induced magnetic field by the grid leg induced by the generated arc may be applied to the magnetic field region.

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

In addition, according to one embodiment of the present invention, an arc induction path (A.P) to move the arc in the left or right direction according to the flow of current of the arc is formed by the magnetic field formed by the magnet part, and the grid of the arc extinguishing part is formed. arc can be applied more rapidly.

In addition, the present invention forms an arc guiding path (A.P) in the upper left or upper right direction of the arc with net electromagnetic force by the grid leg and the magnet part, so that the arc is quickly applied to the grid and extinguished regardless of the flow of the arc current. can make it

The present invention provides a protruding contact and a low runner in contact with a fixed contact and a movable contact in a spaced state in a trip state in a first state, and a protruding contact and a low runner in a spaced apart state in a second state, so that small current interruption in a DC air circuit breaker is possible. For arcs that occur when they occur, 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.

Also, according to the present invention, an air gap may be formed between the protruding contact and the grid leg. Since the air gap increases the pressure in the arc generating region, the generated arc may receive an increasing force. 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 the air circuit breaker of FIG. 1 .
6 and 7 are perspective views illustrating one embodiment of an arc extinguishing unit provided in the air circuit breaker of FIG. 1 from different directions.
FIG. 8 is a front view illustrating an embodiment of the arc extinguishing unit shown in FIG. 6 .
FIG. 9 is a plan view illustrating an embodiment of an arc extinguishing unit shown in FIG. 6 .
FIG. 10 is a side view illustrating an embodiment of an arc extinguishing unit shown in FIG. 6 .
11 is a perspective view showing the movable contact band shown in FIG. 6;
FIG. 12 is a perspective view illustrating a blocking unit and an arc extinguishing unit shown in FIG. 5 .
FIG. 13 is a partially enlarged view illustrating a state in which protruding contacts, low runners, fixed contacts, and movable contacts of the blocking unit and arc extinguishing unit shown in FIG. 12 are contacted or separated from each other in a first trip state.
FIG. 14 is a perspective view illustrating a state in which the blocking unit and the arc extinguishing unit shown in FIG. 12 are disposed in a tripped state.
FIG. 15 is a perspective view of the blocking portion and the arc extinguishing portion shown in FIG. 14 viewed from another direction.
FIG. 16 is a front view illustrating a blocking portion and an arc extinguishing portion shown in FIG. 15 .
FIG. 17 is a perspective view illustrating a magnetic field MF and a magnetic field area MFA in a state in which the blocking unit and the arc extinguishing unit shown in FIG. 14 are disposed in a tripped state.
18 to 23 are conceptual views for explaining an arc induction path AP formed by a magnetic field of a grid leg and a magnetic field of a magnet part when an arc is generated.
24 is a cross-sectional view showing a state in which a rear cover is removed from an air circuit breaker according to another embodiment of the present invention.
25 is a view for illustratively explaining the shape of a magnet formed according to various embodiments of the present invention.

Hereinafter, an air circuit breaker according to an embodiment of the present invention 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. It refers to an area where the movable contact and the fixed contact are spaced apart and an arc is likely to occur. In particular, when there is a protruding contact, it means an area where the protruding contact and the low runner are spaced apart and an arc is likely to occur.

"Arc-guided Path, A.P." means a direction of an electromagnetic force received by an arc generated by a magnet part according to an embodiment of the present invention by a Lorentz force. 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 part 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 310 . 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 310 and the movable contact point 320 contact each other, the row runner 330 may be in contact with a protruding contact point 322 to be described later and may be energized.

The low runner 330 may serve to induce an arc generated when the fixed contact 310 and the movable contact 320 are separated from each other and transfer the arc 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 and the trip operation can be performed.

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. 13 , 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 FIGS. 12 and 13 , 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. 13 and the like, 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, 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 311 are first separated with a very short time difference. After that, the protruding contact point 322 and the 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. 12 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 a second state in which 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. 12 shows an energized state, FIG. 13 shows a first state, and FIG. 14 shows a second state.

Referring to FIG. 13 , 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. 14 , 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). By moving from the area A.A1) between the protruding contact 322 and the low runner 330 (the first arc generating area A.A2), the arc extinguishing part 600, that is, the grid 620 is moved close to do.

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. Grid Legs

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. 16 , 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. 16 , 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, an air gap A.G, which is a spaced apart space, may be formed between the grid leg 621 and the protruding contact point 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 strength 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. 16 , the widthwise length of the upper part of the first grid leg 621a and the second grid leg 621b and the length of the lower part in the widthwise direction are the same or similar to 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. 16 , 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.

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. 16 , 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 pressure applied to the arc may not be sufficient because the length of the air gap A.G is large.

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.

outermost grid

Referring to FIG. 6 , an outermost grid 625 having a relatively short length among the grids may be included. The outermost grid 625 is a grid disposed closest to the fixed contact 311 among a plurality of grids.

By forming the length of the outermost grid 625 short, to induce a 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 necessary space for arranging various configurations.

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 . Grid leg grooves 627 may also be formed between the grid legs 626 of the outermost grid 625 .

6. 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 point 322 and the grid leg 621 . An air gap (A.G) is formed between the protruding contact point 322 and the grid leg 621, thereby increasing the pressure applied to the arc generated between the protruding contact point 322 and the low runner 330, thereby reducing the generated arc. A force to rise may be applied.

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.

7. Magnet part 500

The blocking unit 300 according to an embodiment of the present invention may include a magnet unit 500 .

Referring to FIG. 12 , the magnet part 500 is disposed between the low runner 330 and the fixed contact point 310 . The magnet part 500 may be formed to fill a space formed between the low runner 330 and the fixed contact point 310 .

In another embodiment, the magnet part 500 may be formed such that a part of the space between the low runner 330 and the fixed contact point 310 is emptied. Specifically, when the space portion is formed in a shape other than a rectangular hexagon, the magnets 510 filled in the space portion may be formed in a rectangular shape. Accordingly, an empty space may be partially formed in the space between the low runner 330 filled with the magnet 510 and the fixed contact point 310 .

Meanwhile, in another embodiment of the present invention, the magnet part 500 may protrude and extend toward either side of the row runner 330 in one direction. Specifically, the magnet 510 of the magnet unit 500 may be wider than the width of the low runner 330 . Accordingly, the intensity of the magnetic field M.F applied to the magnetic field area M.F.A may be increased.

Also, in another embodiment of the present invention, the magnet part 500 may protrude and extend toward the front of the row runner 330 . That is, the magnet 510 of the magnet part 500 is made wider than the width of the low runner 330, and may extend and protrude in the forward direction of the low runner 330, that is, in the direction toward the movable contact 321. . Through this, as the distance between the magnet 510 and the magnetic field area M.F.A decreases, the strength of the magnetic field M.F applied to the magnetic field area M.F.A may increase.

Accordingly, the intensity of the magnetic field M.F forming the arc induction path A.P may be enhanced. As a result, since the strength of the electromagnetic force is also strengthened, the generated arc can be rapidly moved and extinguished toward the arc extinguishing unit 600 along the arc induction path A.P.

However, in the above-described embodiment, the magnet part 500 protruding to the side of the low runner 330 or toward the front of the low runner 330 interferes with the grid 620 or the movable contact point 320. A length protruding toward the side of the row runner 330 or a degree of protrusion toward the front surface of the row runner 330 may be adjusted so as not to

Referring to FIG. 17 , the magnet part 500 forms a magnetic field M.F between the fixed contact point 311 and the movable contact point 321 . The magnetic field formed by the magnet unit 500 may apply electromagnetic force to the arc so as to guide the path of the arc generated when the fixed contact 311 and the movable contact 321 are separated to the outside.

The magnetic field area M.F.A formed by the magnet part 500 may be between the fixed contact 311 and/or the low runner 330 and the movable contact 321 . However, this is only an area set up to help understanding. That is, it means a space in which the magnetic field (MF) formed by the magnet part 500 directly affects the arc in the path where the arc is formed.

The magnet 510 includes a first face 511 and a second face 512 . The magnet 510 includes a first surface 511 magnetized to an N pole and a second surface 512 magnetized to an S pole disposed on opposite surfaces, and the first surface 511 is fixed. It may be disposed in a direction adjacent to the contact point 311 .

Specifically, referring to the drawing, the first surface 511 magnetized to the N pole and the lower side may be disposed, and the second surface 512 magnetized to the S pole may be disposed to the upper side.

Accordingly, the direction of the magnetic field M.F may be formed in a direction in which lines of magnetic force come out from the first surface 511 and enter the second surface 512 . Specifically, referring to FIG. 17 , the direction of the magnetic field M.F. may be formed from the bottom to the top in the arc generating region. Through this arrangement, the magnetic field M.F applied to the magnetic field area M.F.A generated in the magnet unit 500 may be directed upward.

On the other hand, unlike the above in other embodiments, the first surface 511 magnetized to the N pole is disposed toward the upper side, and the second surface 512 magnetized to the S pole is disposed toward the lower side. have.

In this case, the magnetic field formed by the magnet unit 500 may be formed in a direction from the arc extinguishing unit 600 toward the movable contact unit 320 . That is, the magnetic field formed by the magnet unit 500 may be formed from top to bottom with reference to FIG. 17 .

shape of magnet part

The shape of the magnet part 500 may be made to fill a space formed between the row runner 330 and the fixed contact stand 310 .

For example, FIG. 25 is a diagram for illustratively explaining the shape of a magnet 510 formed according to various embodiments of the present invention.

Specifically, (a) is a magnet 510 disposed between the fixed contact point 310 and the low runner 330 when the fixed contact point 310 is formed vertically and the low runner 330 is formed obliquely ) is the shape of

In (b), the fixed contact point 310 extends obliquely, that is, the fixed contact point 310 extends at a predetermined angle toward the arc extinguishing unit 600, and the low runner 330 bends the bent portion 331 ) This is the shape of the magnet 510 disposed between the fixed contact point 310 and the low runner 330 in the case of having.

(c) is a magnet 510 disposed between the fixed contact point 310 and the low runner 330 when the fixed contact point 310 is formed vertically and the low runner 330 has a bent portion 331 ) is the shape of

The magnet unit 500 includes a plurality of magnets 510 segmented into plural pieces, and the plurality of magnets 510 may be formed by being stacked in a horizontal or vertical direction.

(d) is a magnet 510 in the shape of a rectangular parallelepiped whose lower and upper surfaces are the same size. In this case, a separation space may be formed between the magnet 510 and the low runner 330 .

(e) shows a case in which magnets 510 are vertically stacked in the shape of (a). (f) shows the shape of the magnet 510 when the magnets 510 are horizontally stacked in the shape of (a).

Even in cases (b) and (c), the magnets 510 may be stacked horizontally or vertically.

Another embodiment of row runner 330

Meanwhile, referring to FIG. 24 according to another embodiment of the present invention, the fixed contact strip 310 obliquely extends toward the arc extinguishing unit 600, and the low runner 330 protects the arc extinguishing unit 600. It may extend obliquely toward the

The row runner 330 may include a bent portion 331 formed between both ends and configured to change an angle between the row runner 330 and the fixed contact point 310 .

Specifically, as shown in FIG. 24 , the row runner 330 may include a bent portion 331 whose angle with the fixed contact point 310 changes.

The bent part 331 not only can firmly support the magnet 510 disposed inside, but also the low runner 330 has the bent part 331, so that the low runner 330 and the fixed contact point 310 ) The width of the lower side of the space between the spaces can be formed wide.

Accordingly, the area of the first surface 511 of the magnet 510 inserted into the space is widened, and the direction in which the first surface 511 of the magnet 510 faces is configured to face the magnetic field area M.F.A. can Accordingly, the magnitude of the magnetic field M.F applied to the magnetic field area M.F.A may increase. Accordingly, the Lorentz force applied to the arc increases, and the arc can be extinguished more quickly.

8. 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, the magnetic field affecting the arc may be the magnetic field generated by the magnet part 500 . The direction of the magnetic field coming from the N pole and entering the S pole of the magnet unit 500, that is, the permanent magnet, may be formed. Due to this magnetic field, the arc may receive an electromagnetic force due to the Lorentz force.

In addition, the ferromagnetic material disposed around the area where the arc is generated may be induced to form a magnetic field in a direction obstructing the magnetic field caused by the 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 the Lorentz force due to a magnetic field by a permanent magnet or an induced magnetic field 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.).

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.

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 F2 toward the arc extinguishing part 600, that is, the upper side according to Fleming's left hand rule.

Meanwhile, referring to FIG. 19 , the arc may receive electromagnetic force due to the magnetic field B3 formed by the magnet part 500 .

Specifically, the magnetic field B3 formed by the magnet part 500 is directed upward, that is, toward the arc extinguishing part 600 .

Considering the current direction of the arc and the direction of the magnetic field B3 formed by the magnet part 500, according to Fleming's left hand rule, the arc receives the electromagnetic force F3 in the right direction. That is, the direction of the electromagnetic force F3 received by the arc by the magnetic field B3 of the magnet part 500 is the rightward direction.

Referring to FIG. 20, the net force of the electromagnetic force applied to the arc is the electromagnetic force F2 by the magnetic field B2 induced by the grid leg 621 and the electromagnetic force by the magnetic field B3 by the magnet unit 500. It is the force (F) synthesized by (F3). That is, the arc induction path A.P applied to the arc may be formed in a direction toward the upper right side.

As such, the arc may be applied toward the grid 620 or the grid leg 621 of the arc extinguishing unit 600 by forming the arc inducing path A.P.

An arc extinguishing unit and an air circuit breaker 10 including the same according to an embodiment of the present invention induce an arc through an electromagnetic force applied to an arc by a magnetic field induced in a grid leg 621 and a magnetic field of a magnet unit 500 A path A.P is formed toward the grid 620 and/or the grid leg 621. Through this, the arc, which has insufficient power to rise due to the small current, can be raised by receiving the electromagnetic force. Accordingly, the arc can be extinguished more quickly.

In addition, as described above, by forming the air gap A.G between the protruding contact 322 and the grid leg 621, the pressure applied to the generated arc increases, so that the arc tends to rise toward the arc extinguishing unit 600. force arises.

Therefore, the force applied to the arc is the electromagnetic force F2 due to the magnetic field induced in the grid leg 621, the electromagnetic force F3 due to the magnetic field of the magnet part 500, and the rising force due to the pressure caused by the air gap A.G. to be. Accordingly, the arc can be more easily applied to the arc extinguishing unit 600 .

Referring to FIG. 21 , 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 F2 towards the arc extinguishing part 600, that is, the upper side according to Fleming's left hand rule.

Referring to FIG. 22 , the magnetic field B3 formed by the magnet part 500 is formed upward with respect to the arc. According to Fleming's left-hand rule in consideration of the current direction of the arc and the direction of the magnetic field B3 of the magnet part 500, the electromagnetic force F3 applied to the arc by the magnetic field B3 formed by the magnet part 500 is it is to the left

Referring to FIG. 23, the net force of the electromagnetic force applied to the arc is the electromagnetic force F2 by the magnetic field B2 induced by the grid leg 621 and the electromagnetic force by the magnetic field B3 by the magnet unit 500. It is the force (F) synthesized by (F3). That is, the arc induction path A.P applied to the arc may be formed in a direction toward the upper left side.

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 .

The air circuit breaker 10 according to an embodiment of the present invention induces an arc through an electromagnetic force applied to the arc by a magnetic field B2 induced by the grid leg 621 and a magnetic field B3 by the magnet unit 500. A path A.P is formed toward the grid 620. Through this, the arc, which lacks the power to rise due to the small current, can be raised by receiving the electromagnetic force. Accordingly, the arc can be extinguished more quickly.

In addition, as described above, by forming the air gap A.G between the protruding contact 322 and the grid leg 621, the pressure applied to the generated arc increases, so that the arc tends to rise toward the arc extinguishing unit 600. force arises.

Therefore, the force applied to the arc is the electromagnetic force F2 due to the magnetic field induced in the grid leg 621, the electromagnetic force F3 due to the magnetic field of the magnet part 500, and the rising force due to the pressure caused by the air gap A.G. to be. Accordingly, the arc can be more easily applied to the arc extinguishing unit 600 .

On the other hand, unlike the above in other embodiments, the first surface 511 magnetized to the N pole is disposed toward the upper side, and the second surface 512 magnetized to the S pole is disposed toward the lower side. have.

Accordingly, the magnetic field formed by the magnet unit 500 may be formed opposite to that in the above-described embodiment. Specifically, the magnetic field formed by the magnet part 500 may be formed in the direction of the movable contact point 321 and the fixed contact point 311 in the arc extinguishing part 600 centering on the arc.

In this case, the electromagnetic force received by the arc due to the magnetic field formed by the magnet unit 500 is opposite to that in the above-described embodiment.

However, even in this case, regardless of the current direction of the arc, the direction of the electromagnetic force by the magnetic field of the magnet part 500 directs the arc toward the grid leg 621 and/or the grid 620 . Specifically, even if the N pole and the S pole of the magnet part 500 are arranged opposite to the above-described embodiment, the electromagnetic force received by the arc due to the magnetic field formed by the magnet part 500 may be right or left.

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
511 page 1
512 second side
600: arc extinguishing unit
610: side plate
620: grid
621: grid leg
621a: first grid leg
621b: second grid leg
622: grid leg home
625: outermost grid
626 grid legs
627 Grid Leg Home
630: grid cover
631: cover body
632: upper frame
633: mesh part
650: arc runner
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 (11)

fixed contact;
a movable contact that moves in a direction toward or away from the fixed contact;
The fixed contact point is disposed at the bottom and the fixed contact point extends upward;
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;
a magnet part disposed between the low runner and the fixed contact stand and forming a magnetic field between the fixed contact and the movable contact to induce an arc path generated when the fixed contact and the movable contact are separated; and
An arc extinguishing unit including a plurality of side plates and a grid coupled between the side plates,
The grid is
Including grid legs extending downward from both ends in the width direction so that an induced magnetic field can be formed by an arc generated when the fixed contact and the movable contact are spaced apart.
air breaker. According to claim 1,
The grid leg,
Extending adjacent to the end of the side plate,
air breaker. According to claim 2,
The grid leg,
a first grid leg extending from one end of the grid in a width direction; and
A second grid leg extending from the opposite side of the first grid leg;
The first grid leg and the second grid leg have the same width,
air breaker. According to claim 3,
Further comprising a protruding contact extending upward from the movable contact,
The grid leg,
Made to wrap the protruding contact on both sides,
air breaker. According to claim 4,
The first grid leg and the second grid leg,
Made to have a width wider than the length of the air gap, which is the distance between the first grid leg or the second grid leg and the protruding contact,
air breaker. According to claim 1,
The low runner,
Made so that the distance apart from the fixed contact band becomes longer as it goes upward,
air breaker. According to claim 1,
The shape of the magnet part is,
Made to fill the space formed between the row runner and the fixed contact band,
air breaker. According to claim 1,
The magnet part,
It is disposed on opposite surfaces and includes a first surface magnetized with an N pole and a second surface magnetized with an S pole,
The first surface is disposed in a direction adjacent to the fixed contact,
air breaker. According to claim 1,
The fixed contact band,
Extending upward and extending at a predetermined angle toward the row runner,
air breaker. According to claim 1,
In a trip state in which the fixed contact and the movable contact are spaced apart,
A magnetic field region in which electromagnetic force is applied to a generated arc is formed in a space between the low runner and the movable contact and in a space below the grid,
air breaker. According to claim 10,
In the magnetic field region,
A magnetic field by the magnet part, and
An induced magnetic field by the grid leg induced by the generated arc is applied,
air breaker.

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