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CN-115280453-B - Arc extinguishing part and air circuit breaker comprising same

CN115280453BCN 115280453 BCN115280453 BCN 115280453BCN-115280453-B

Abstract

Disclosed are an arc extinguishing part and an air circuit breaker including the same. The arc extinguishing part of the embodiment of the invention comprises an arc extinguishing magnet positioned on the upper side of the grid. The arc extinguishing magnet forms a magnetic field at the arc extinguishing part, and the fixed contact and the movable contact which are positioned at the position adjacent to the arc extinguishing part. The arc generated by the separation of the fixed contact and the movable contact will receive electromagnetic forces inside the magnetic field formed. The electromagnetic force is formed in a direction passing through the grill toward the outside of the arc extinguishing portion. Thus, the generated arc can be extinguished and moved rapidly.

Inventors

  • Li Shangche

Assignees

  • LS电气株式会社

Dates

Publication Date
20260508
Application Date
20210303
Priority Date
20200313

Claims (15)

  1. 1. An arc extinguishing part, wherein, Comprising the following steps: a plurality of support plates disposed opposite to each other; a grid positioned between the support plates and combined with the plurality of support plates respectively; a grill cover combined with the grill and covering the grill, and An arc extinguishing magnet accommodated inside the grill cover, The quenching magnet forms a magnetic field in a direction from the grill cover toward the grill or in a direction from the grill toward the grill cover, The grill cover includes: A cover body having an accommodation space inside; a blocking plate positioned in the receiving space of the cover main body, The arc extinguishing magnet is accommodated in the accommodating space of the cover main body and is arranged on the blocking plate.
  2. 2. The arc extinguishing portion according to claim 1, wherein, The grill cover includes: a mesh part accommodated in the accommodation space of the cover main body, The arc extinguishing magnet is located between the grid part and the blocking plate.
  3. 3. The arc extinguishing portion according to claim 2, wherein, The grill cover includes an upper frame that is coupled with the cover body and covers the cover body.
  4. 4. The arc extinguishing portion according to claim 1, wherein, The grids are provided in plural and spaced apart from each other, The side of the grid cover facing the grids is communicated with a space formed by separating a plurality of grids from each other.
  5. 5. The arc extinguishing portion according to claim 4, wherein, The blocking plate is provided with a plurality of through holes communicating with the spaces formed by the grids spaced apart from each other.
  6. 6. The arc extinguishing portion according to claim 5, wherein, The grill cover includes a magnet cover which is received in the receiving space of the cover body, is disposed at the blocking plate, and surrounds at least one of sides of the arc extinguishing magnet.
  7. 7. The arc extinguishing portion according to claim 6, wherein, The magnet cover includes an insulating material.
  8. 8. The arc extinguishing portion according to claim 6, wherein, The magnet cover includes: A first opening part which is opened and is arranged to overlap with and communicate with the plurality of through holes provided in the blocking plate, and A second opening portion which is opened and accommodates the arc extinguishing magnet, The first opening and the second opening are disposed apart from each other.
  9. 9. The arc extinguishing portion according to claim 6, wherein, The grill cover includes: a grid part which is accommodated in the accommodation space of the cover main body and is arranged on the arc extinguishing magnet and the magnet cover, The mesh portion includes a plurality of through holes communicating with the through holes of the blocking plate.
  10. 10. The arc extinguishing portion according to claim 9, wherein, The grill cover includes an upper frame coupled to the cover body and covering the mesh part, The upper frame includes a through hole portion formed therethrough and communicating with the through hole of the mesh portion.
  11. 11. An air circuit breaker, wherein, Comprising the following steps: A fixed contact; a movable contact moving in a direction toward or away from the fixed contact, and An arc extinguishing portion located adjacent to the fixed contact and the movable contact for extinguishing an arc generated by the separation of the fixed contact and the movable contact, The arc extinguishing part includes: A plurality of support plates spaced apart from each other and disposed opposite to each other; A plurality of grids disposed between and respectively coupled to the plurality of support plates and extending between one side facing the fixed contact and the movable contact and the other side opposite to the fixed contact and the movable contact; A cover body coupled to the plurality of support plates, respectively, disposed adjacent to the other sides of the plurality of grids, and covering the other sides of the plurality of grids; An arc extinguishing magnet accommodated in an accommodation space provided in the cover main body and forming a magnetic field in a direction from the cover main body toward the plurality of grids or in a direction from the plurality of grids toward the cover main body, and A blocking plate positioned in the receiving space of the cover main body, The arc extinguishing magnet is accommodated in the accommodating space of the cover main body and is arranged on the blocking plate.
  12. 12. The air circuit breaker of claim 11, wherein, Comprising the following steps: and the magnet cover is accommodated in the accommodating space of the cover main body, is arranged on the blocking plate and surrounds the arc extinguishing magnet.
  13. 13. The air circuit breaker of claim 12, wherein, The blocking plate comprises a plurality of through holes which are communicated with a space formed by separating the grids, The magnet cover includes: A first opening part which is arranged to overlap with the plurality of through holes and is formed to penetrate and communicate with the plurality of through holes, and And a second opening portion which is disposed apart from the first opening portion, and which penetrates and accommodates the arc extinguishing magnet.
  14. 14. The air circuit breaker of claim 11, wherein, Comprising the following steps: a movable contact holder electrically connected to the movable contact, extending in a direction opposite to the arc extinguishing portion and partially exposed to the outside, and A current transformer magnet part covering a portion of the movable contact frame exposed to the outside, The current transformer magnet part includes: A housing having a space portion therein, and And a current transformer magnet which is accommodated in the casing and forms a magnetic field in a direction from the current transformer magnet part to the arc extinguishing part or in a direction from the arc extinguishing part to the current transformer magnet part.
  15. 15. The air circuit breaker of claim 14, wherein, The respective faces of the arc extinguishing magnet and the current transformer magnet facing each other are magnetized to polarities different from each other.

Description

Arc extinguishing part and air circuit breaker comprising same Technical Field The present invention relates to an arc extinguishing part and an air circuit breaker including the same, and more particularly, to an arc extinguishing part capable of blocking current to effectively extinguish a generated arc and an air circuit breaker including the same. Background A circuit breaker refers to a machine that can allow or block energization to the outside by contact and separation of a fixed contact and a movable contact. The fixed contact and the movable contact provided in the circuit breaker are electrically connectable to an external power source or load, respectively. The movable contact is movably provided to the circuit breaker. The movable contact may be movable in a direction toward the fixed contact or in a direction away from the fixed contact. If the movable contact is in contact with the fixed contact, the circuit breaker may be electrically connectable with an external power source or load. In the case where an overcurrent or an abnormal current flows through the circuit breaker, the movable contact and the fixed contact in a contact state are spaced apart from each other. At this time, the current passing between the movable contact and the fixed contact is not extinguished immediately, but is changed into the form of an arc (arc) and extends along the movable contact (extend). An arc may be defined as a flow of electrons at high temperature and high pressure. Therefore, if the generated arc stays in the breaker internal space for a long time, the constituent elements of the breaker may be damaged. In addition, in the case where the arc is discharged to the outside of the circuit breaker without an additional process, the user may be injured. Therefore, a circuit breaker is generally provided with extinguishing means for extinguishing (extinguish) and discharging an arc. The generated arc passes through the extinguishing device, the arc pressure is increased, the moving speed is increased, and the generated arc is cooled and can be discharged to the outside. Thus, the generated arc should be rapidly induced toward the arc extinguishing device. Korean laid-open patent publication No. 10-2015-0001499 discloses a circuit breaker of a gas-insulated switchgear that improves arc energy utilization. Specifically, a gas-filled (buffer) circuit breaker capable of improving arc extinguishing performance by increasing the pressure of extinguishing gas by using arc energy is disclosed. However, this type of circuit breaker has a limitation in that it can be applied only to a circuit breaker provided with other gases as a medium for extinguishing an arc. That is, the conventional document has a limitation in that it is applicable only to the case of applying SF6 (Sulfur hexafluoride: sulfur hexafluoride) as a medium for extinguishing an arc, but is difficult to apply to an air circuit breaker using air as a medium. Korean laid-open patent publication No. 20-100000825 discloses a current limiting structure of an air circuit breaker. The current limiting structure of the air circuit breaker comprises grids stacked to have a certain gap in an arc chamber and form a guiding groove so that contacts can be positioned, and the grids are arranged on the side walls of the guiding groove of the grids. However, this type of circuit breaker, although it can induce an arc toward the grid through the guide plate, fails to disclose a solution for forming a path of an arc that does not flow toward the guide plate. That is, the limitation of the prior document is that a scheme for efficiently forming a path of an arc not adjacent to the guide plate is not examined. Disclosure of Invention Problems to be solved by the invention The present invention has an object to provide an arc extinguishing portion having a structure capable of solving the above-described problems, and an air circuit breaker including the arc extinguishing portion. First, an object of the present invention is to provide an arc extinguishing unit configured to quickly extinguish and move an arc generated therein, and an air circuit breaker including the arc extinguishing unit. Further, an object of the present invention is to provide an arc extinguishing unit in which a magnet that forms a magnetic field related to a moving path of an arc is not damaged by the arc, and an air circuit breaker including the arc extinguishing unit. Further, an object of the present invention is to provide an arc extinguishing unit having a structure that does not require excessive design changes to provide a magnet that forms a magnetic field related to a moving path of an arc, and an air circuit breaker including the arc extinguishing unit. Further, an object of the present invention is to provide an arc extinguishing unit in which a magnet provided in a structure of the arc extinguishing unit is not randomly shaken and can be stably held in place, and an air circuit breaker i