WO2022124360A1 - 消弧装置および消弧装置の製造方法 - Google Patents

消弧装置および消弧装置の製造方法 Download PDF

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Publication number
WO2022124360A1
WO2022124360A1 PCT/JP2021/045269 JP2021045269W WO2022124360A1 WO 2022124360 A1 WO2022124360 A1 WO 2022124360A1 JP 2021045269 W JP2021045269 W JP 2021045269W WO 2022124360 A1 WO2022124360 A1 WO 2022124360A1
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WO
WIPO (PCT)
Prior art keywords
side wall
arc extinguishing
extinguishing device
upper lid
arc
Prior art date
Application number
PCT/JP2021/045269
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
徳佳 原
憲一 江古
賢一 春名
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN202180080275.9A priority Critical patent/CN116569299A/zh
Priority to JP2022568324A priority patent/JP7378643B2/ja
Publication of WO2022124360A1 publication Critical patent/WO2022124360A1/ja

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate

Definitions

  • the present disclosure relates to an arc extinguishing device and a method for manufacturing an arc extinguishing device that extinguishes an arc generated when a circuit breaker cuts off a current.
  • a circuit breaker is an electrical device that protects a circuit from overcurrent by automatically breaking the circuit in the event of an electrical overload or short-circuit accident.
  • the circuit breaker is equipped with an arc extinguishing device for quickly extinguishing the arc generated when the current is interrupted.
  • the arc extinguishing device includes a structure in which a plurality of metal grids are held at regular intervals by an arc extinguishing plate made of an insulating material.
  • Patent Document 1 a pair of arc-extinguishing plates are integrally molded with resin, a grid is slid into each of a plurality of grooves formed in the arc-extinguishing plates, and each of the plurality of grids is fitted to the arc-extinguishing plates. Is disclosed. According to the technique of Patent Document 1, since the grid can be attached to the arc extinguishing plate by inserting the grid into the groove, a step such as caulking or bonding for attaching the grid becomes unnecessary.
  • the present disclosure has been made in view of the above, and an object thereof is to obtain an arc extinguishing device that can be easily removed from the circuit breaker and attached to the circuit breaker.
  • the arc extinguishing device is an arc extinguishing device that extinguishes the arc generated when the circuit breaker cuts off the current.
  • the arc extinguishing device has a first side wall and a second side wall facing each other, and is held by a lower lid constituting the outer shell of the arc extinguishing device and the inside of the arc extinguishing device. It is provided with a plurality of grids for dividing the arc in the above, and an upper lid attached to the lower lid and covering the plurality of grids.
  • the lower lid, the plurality of grids, and the upper lid form a unit structure that can be removed from the circuit breaker in a state of being integrated with each other and can be attached to the circuit breaker in a state of being integrated with each other.
  • Each of the first side wall and the second side wall has a plurality of holding grooves. Each of the plurality of grids is held by the holding groove of the first side wall and the holding groove of the second side wall.
  • the arc extinguishing device has an effect that it can be easily removed from the circuit breaker and attached to the circuit breaker.
  • FIG. 3 for explaining the assembly of the arc extinguishing device according to the first embodiment.
  • FIG. 4 for explaining the assembly of the arc extinguishing device according to the first embodiment.
  • FIG. 5 for explaining the assembly of the arc extinguishing device according to the first embodiment.
  • FIG. 2 shows a top lid and a ejection prevention plate constituting the arc extinguishing device according to the third embodiment.
  • FIG. 1 is a perspective view of the arc extinguishing device 100 according to the first embodiment.
  • the arc extinguishing device 100 is attached to the circuit breaker and extinguishes the arc generated when the circuit breaker interrupts the current.
  • the circuit breaker is not shown.
  • the arc extinguishing device 100 includes a lower lid 1 constituting the outer shell of the arc extinguishing device 100, an arc extinguishing iron plate 2 held by the lower lid 1, a plurality of grids 3, and an upper lid detachably attached to the lower lid 1. It has a spout prevention plate 5 and two heat-resistant sheets 6 that are detachably attached to the upper lid 4.
  • the lower lid 1 and the upper lid 4 form an arc extinguishing chamber that extinguishes the arc generated between the fixed contact and the movable contact of the circuit breaker.
  • the plurality of grids 3 are arranged in the arc extinguishing chamber and are not shown in FIG.
  • the lower lid 1, the arc-extinguishing iron plate 2, the plurality of grids 3, the upper lid 4, the ejection prevention plate 5, and the two heat-resistant sheets 6 can be mounted on the circuit breaker in an integrated state and are integrated with each other. Constructs a unit structure that can be removed from the circuit breaker.
  • the screw 7 penetrates the heat-resistant sheet 6 and the ejection prevention plate 5, and fixes the upper lid 4 to the lower lid 1. Further, the screw 7 fixes the heat-resistant sheet 6 and the ejection prevention plate 5 to the upper lid 4.
  • a screw 8 for fixing the arc extinguishing device 100 to the circuit breaker is attached to the arc extinguishing device 100. The screw 8 is attached to the back side of the paper surface in FIG. 1 of the upper lid 4, and is not shown in FIG.
  • FIG. 2 is a perspective view of the lower lid 1 constituting the arc extinguishing device 100 according to the first embodiment.
  • the lower lid 1 has a first side wall 10a and a second side wall 10b facing each other.
  • the first side wall 10a and the second side wall 10b are plate portions parallel to each other and are arc-extinguishing plates constituting the arc-extinguishing chamber.
  • the first direction in which the first side wall 10a and the second side wall 10b face each other is the left-right direction
  • the direction perpendicular to the left-right direction is the direction in which the lower lid 1 and the upper lid 4 are lined up.
  • the second direction is the vertical direction
  • the third direction which is the direction perpendicular to the vertical direction and the horizontal direction, is the front-back direction.
  • the side with the upper lid 4 as viewed from the lower lid 1 is referred to as the upper side, and vice versa.
  • the lower lid 1 is a structure in which the left and right directions are shielded by the first side wall 10a and the second side wall 10b, and both the vertical direction and the front-rear direction are open.
  • the notch 12 is formed. Three notches 12 are formed on the upper edge of the first side wall 10a. Three notches 12 are formed on the upper edge of the second side wall 10b. Each notch 12 of the first side wall 10a and the second side wall 10b has a rectangular shape with rounded corners in order to prevent damage to the lower lid 1 due to the internal pressure of the arc extinguishing device 100. With the upper lid 4 fixed to the lower lid 1, each notch 12 constitutes an opening.
  • the increase in internal pressure is alleviated by discharging the gas generated when the circuit breaker interrupts the current from the opening to the outside of the arc extinguishing chamber.
  • the number of notches 12 formed on the first side wall 10a and the number of notches 12 formed on the second side wall 10b are not limited to three, and may be arbitrary. Further, it is assumed that the shape of the notch 12 is arbitrary.
  • Each of the first side wall 10a and the second side wall 10b has a plurality of holding grooves 11.
  • the plurality of holding grooves 11 are provided on each of the inner surface of the arc extinguishing chamber of the first side wall 10a and the inner surface of the arc extinguishing chamber of the second side wall 10b.
  • Each holding groove 11 of the first side wall 10a and each holding groove 11 of the second side wall 10b are groove portions into which the arc extinguishing iron plate 2 or the grid 3 is inserted.
  • Each holding groove 11 of the first side wall 10a and each holding groove 11 of the second side wall 10b are formed along the vertical direction.
  • the plurality of holding grooves 11 of the first side wall 10a are arranged in the front-rear direction.
  • the plurality of holding grooves 11 of the first side wall 10a include a holding groove 11 for holding the arc extinguishing iron plate 2 and a holding groove 11 for holding the grid 3.
  • the plurality of holding grooves 11 of the second side wall 10b are arranged in the front-rear direction.
  • the plurality of holding grooves 11 of the second side wall 10b include a holding groove 11 for holding the arc extinguishing iron plate 2 and a holding groove 11 for holding the grid 3.
  • each holding groove 11 the upper end portion 11a of the holding groove 11 is open.
  • the lower end of the holding groove 11 into which the arc extinguishing iron plate 2 is inserted is hit by the lower end of the arc extinguishing iron plate 2 inserted into the holding groove 11.
  • the arc-extinguishing iron plate 2 is positioned on the lower lid 1 by the lower end portion of the arc-extinguishing iron plate 2 hitting the lower end portion of the holding groove 11.
  • the lower end of the holding groove 11 into which the grid 3 is inserted is hit by the lower end of the grid 3 inserted into the holding groove 11.
  • Each grid 3 is positioned on the lower lid 1 by the lower end of the grid 3 hitting the lower end of the holding groove 11.
  • the lower end of each holding groove 11 functions as a positioning portion 19 for positioning the arc extinguishing iron plate 2 or positioning the grid 3.
  • the lower lid 1 has two connecting portions 13a and 13b that connect the upper part of the first side wall 10a and the upper part of the second side wall 10b.
  • Each of the connecting portions 13a and 13b connects the first side wall 10a and the second side wall 10b to each other, and constitutes the frame 14 together with the first side wall 10a and the second side wall 10b.
  • the rigidity of the lower lid 1 is ensured by forming the frame body 14 by the two connecting portions 13a and 13b, the first side wall 10a, and the second side wall 10b.
  • a locking portion 15 is provided on the connecting portion 13a, which is one of the two connecting portions 13a and 13b.
  • the locking portion 15 is provided outside the arc extinguishing chamber so as to be fitted to the circuit breaker.
  • a hole 16 through which a screw 8 is passed is formed in the connecting portion 13b, which is the other of the two connecting portions 13a and 13b.
  • a guide-shaped portion 17 having a shape capable of fitting the outer edge of the upper lid 4 is formed on the upper edge of the frame body 14.
  • the connecting portion 13a is formed with a positioning portion 18a which is a protruding portion for positioning the upper lid 4 on the lower lid 1.
  • the connecting portion 13b is formed with a positioning portion 18b for positioning the upper lid 4 on the lower lid 1.
  • the positioning portion 18b is a notch portion formed so that a part of the upper lid 4 can be fitted.
  • the material of the lower lid 1 As the material of the lower lid 1, a thermosetting resin or a thermoplastic resin having insulating properties, flame retardancy and rigidity is used. By using such a material, the lower lid 1 having a complicated shape including each of the above parts is integrally molded.
  • FIG. 3 is a perspective view of the arc extinguishing iron plate 2 constituting the arc extinguishing device 100 according to the first embodiment.
  • the arc extinguishing iron plate 2 is a metal plate component that commutates an arc generated when the circuit breaker cuts off the current.
  • the arc extinguishing iron plate 2 has a flat portion 20 formed flat and a commutation portion 21 bent from the flat portion 20.
  • a protrusion 23 is formed on each of the side edge of the first side wall 10a of the flat portion 20 and the side edge of the second side wall 10b of the flat portion 20.
  • a semicircular notch 24 is formed on the edge of the flat portion 20 opposite to the commutation portion 21.
  • the notch 24 constitutes an opening.
  • the increase in the internal pressure of the arc extinguishing device 100 is alleviated by discharging the gas generated when the circuit breaker cuts off the current from the opening to the outside of the arc extinguishing chamber. Since the tip portion 22 of the commutation portion 21 is bent upward, the arc extinguishing iron plate 2 has the effect of retaining the generated arc in the tip portion 22.
  • FIG. 4 is a first diagram for explaining the assembly of the arc extinguishing device 100 according to the first embodiment.
  • FIG. 4 shows a state when the arc extinguishing iron plate 2 is combined with the lower lid 1.
  • the arc-extinguishing iron plate 2 is inserted into the lower lid 1 from above with the side of the flat portion 20 where the commutation portion 21 is provided facing downward.
  • the protrusion 23 on the side edge of the first side wall 10a of the flat portion 20 is inserted into one of the plurality of holding grooves 11 of the first side wall 10a.
  • the protrusion 23 on the side edge of the flat portion 20 on the side of the second side wall 10b is inserted into one of the plurality of holding grooves 11 of the second side wall 10b.
  • the structure in which the positioning portion 19 holds the arc-extinguishing iron plate 2 at the lowest point that the arc-extinguishing iron plate 2 can reach provides an effect of preventing the arc-extinguishing iron plate 2 from falling off from the lower lid 1.
  • the protrusion 23 on the side of the first side wall 10a of the flat portion 20 is inserted into the holding groove 11 of the first side wall 10a, and the protrusion on the side of the second side wall 10b of the flat portion 20 23 is held by the lower lid 1 in a state of being inserted into the holding groove 11 of the second side wall 10b.
  • the arc-extinguishing iron plate 2 constitutes the unit structure by being integrally combined with the lower lid 1.
  • FIG. 5 is a perspective view of the grid 3 constituting the arc extinguishing device 100 according to the first embodiment.
  • the grid 3 is a metal plate component having a notch 30.
  • the notch 30 is formed on the edge of the grid 3 opposite to the upper lid 4, that is, on the lower edge of the grid 3.
  • the notch 30 has a shape in which the width in the left-right direction becomes narrower toward the upper side.
  • the tip portion 30a of the notch 30 is directed upward.
  • the notch 30 has a shape like a deformed V shape.
  • the shape of the notch 30 is asymmetrical in the left-right direction.
  • a protrusion 31 is formed on each of the side edge of the first side wall 10a of the grid 3 and the side edge of the second side wall 10b of the grid 3.
  • FIG. 6 is a second diagram for explaining the assembly of the arc extinguishing device 100 according to the first embodiment.
  • FIG. 6 shows a state when the grid 3 is combined with the lower lid 1 on which the arc extinguishing iron plate 2 is mounted. Each grid 3 is inserted into the lower lid 1 from above with the side in which the notch 30 is formed facing downward.
  • the protrusion 31 on the side edge of the first side wall 10a of the grid 3 is inserted into the holding groove 11 of the first side wall 10a.
  • the protrusion 31 on the side edge of the second side wall 10b of the grid 3 is inserted into the holding groove 11 of the second side wall 10b.
  • the protrusion 31 is slid downward until the protrusion 31 reaches the positioning portion 19 which is the lower end of the holding groove 11.
  • the grid 3 is positioned on the lower lid 1.
  • Each of the plurality of grids 3 is inserted into the holding groove 11 of the first side wall 10a and the holding groove 11 of the second side wall 10b, and is positioned at the lower lid 1. Thereby, the positioning of each grid 3 on the lower lid 1 can be easily performed. Further, the structure in which the positioning portion 19 holds the grid 3 at the lowest point that the grid 3 can reach provides an effect of preventing the grid 3 from falling off from the lower lid 1.
  • the shape of the notch 30 of one grid 3 is the shape in which the notch 30 of the other grid 3 is turned inside out.
  • the plurality of grids 3 are arranged so that the front and back sides are alternately different from each other, and the positions of the tip portions 30a of the notches 30 are different from each other in the left-right direction between the grids 3 adjacent to each other in the front-rear direction.
  • Each of the plurality of grids 3 is arranged so that the grids 3 having different positions of the tip portions 30a in the left-right direction face each other. The arc is guided to the tip portion 30a of each grid 3 and flows in the front-rear direction while traveling along the tip portion 30a of each grid 3.
  • the moving distance of the arc becomes longer as compared with the case where the positions of the tip portions 30a of the tip portions 30a are the same in the plurality of grids 3. ..
  • the arc voltage is increased and the current is cut off.
  • each grid 3 the protrusion 31 on the side of the first side wall 10a of the grid 3 is inserted into the holding groove 11 of the first side wall 10a, and the protrusion 31 on the side of the second side wall 10b of the grid 3 is the second. It is held by the lower lid 1 in a state of being inserted into the holding groove 11 of the side wall 10b of 2.
  • Each grid 3 constitutes the unit structure by being integrally combined with the lower lid 1. When the grid 3 is combined with the lower lid 1, it is not necessary to press-fit the grid 3 into the holding groove 11. Further, the grid 3 does not need to be fitted into the holding groove 11. That is, each grid 3 does not have to be fixed to the holding groove 11.
  • the plurality of grids 3 are arranged in the front-rear direction in the arc extinguishing chamber.
  • the movable contact of the circuit breaker passes through the notch 30 of each grid 3.
  • the arc extinguishing device 100 divides an arc extending in the front-rear direction at each grid 3.
  • FIG. 7 is a perspective view of the upper lid 4 constituting the arc extinguishing device 100 according to the first embodiment.
  • the upper lid 4 is attached on the lower lid 1 and covers the arc-extinguishing iron plate 2 and the plurality of grids 3.
  • the upper lid 4 is a plate component formed so that the ejection prevention plate 5 can be inserted from one end 41 in the front-rear direction.
  • the upper lid 4 functions to prevent the emission of an arc from the inside of the arc extinguishing chamber to the outside of the arc extinguishing chamber.
  • the upper lid 4 has a surface 40 on which the ejection prevention plate 5 is placed, and an edge portion 48 which is a raised portion around the surface 40.
  • the upper lid 4 is formed so that the peripheral edge 48 of the surface 40 is higher than the surface 40.
  • the edge portion 48 is formed over both sides of the upper lid 4 in the left-right direction and the edge of the front-rear direction opposite to the end 41.
  • a plurality of holes 42 for discharging the gas inside the arc extinguishing chamber to the outside of the arc extinguishing chamber are formed on the surface 40.
  • Each hole 42 is circular.
  • the number, position, and shape of the holes 42 formed in the upper lid 4 are arbitrary.
  • a plurality of protrusions 43 protruding from the periphery of the surface 40 are formed on the edge portion 48 so that each of them faces the surface 40.
  • Each protrusion 43 is semi-circular.
  • Three protrusions 43 are formed on one edge of the upper lid 4 in the left-right direction.
  • Three protrusions 43 are also formed on the other edge of the upper lid 4 in the left-right direction. The number and position of the protrusions 43 formed on the upper lid 4 are arbitrary.
  • the ejection prevention plate 5 is passed through the gap between each protrusion 43 and the surface 40.
  • the ejection prevention plate 5 is attached to the upper lid 4 in a state of being inserted between the surface 40 and each protrusion 43 of the edge portion 48.
  • Each protrusion 43 serves to guide the ejection prevention plate 5 so that the ejection prevention plate 5 slides along the surface 40.
  • Each protrusion 43 also functions to prevent the ejection prevention plate 5 from coming off upward from the upper lid 4.
  • the same semi-circular hole 44 as the protrusion 43 is formed at a position of the surface 40 facing the protrusion 43.
  • the slide structure of the mold used for molding the upper lid 4 becomes unnecessary.
  • gas is discharged to the outside of the arc extinguishing chamber in the holes 44 as well.
  • the surface 40 is formed with a hole 46 through which the screw 7 is passed.
  • Two locking portions 45 are provided on the lower portion of the upper lid 4 at the end 41. Each locking portion 45 is provided outside the arc extinguishing chamber so as to be fitted to the circuit breaker.
  • a hole 47 through which a screw 8 is passed is formed at an end of the upper lid 4 opposite to the end 41 in the front-rear direction.
  • a protrusion 49 protruding downward is formed in a portion of the upper lid 4 where the hole 47 is formed. The protrusion 49 is fitted to the positioning portion 18b of the lower lid 1.
  • the material of the top lid 4 As the material of the top lid 4, a thermosetting resin or a thermoplastic resin having insulating properties, flame retardancy and rigidity is used. By using such a material, the upper lid 4 having a complicated shape including each of the above parts is integrally molded.
  • FIG. 8 is a third diagram for explaining the assembly of the arc extinguishing device 100 according to the first embodiment.
  • FIG. 8 shows a state when the ejection prevention plate 5 is inserted into the upper lid 4.
  • the ejection prevention plate 5 is a rectangular plate component. Inside the arc extinguishing chamber, when the circuit breaker cuts off the current, a metal melt is generated by melting the arc extinguishing iron plate 2 or melting the grid 3.
  • the ejection prevention plate 5 functions to prevent the metal melt from being ejected from the inside of the arc extinguishing chamber to the outside of the arc extinguishing chamber. Holes 50 through which the screws 7 are passed are provided at the four corners of the ejection prevention plate 5.
  • the ejection prevention plate 5 is formed with a plurality of holes 51 for discharging the gas inside the arc extinguishing chamber to the outside of the arc extinguishing chamber.
  • the gas inside the arc extinguishing chamber goes out of the arc extinguishing chamber through the hole 42 of the upper lid 4 and the hole 51 of the ejection prevention plate 5.
  • the ejection prevention plate 5 is inserted from the end 41 to the inside of the edge 48.
  • the ejection prevention plate 5 is slid on the surface 40 in the insertion direction so that the end of the ejection prevention plate 5 in the insertion direction reaches the edge portion 48.
  • the ejection prevention plate 5 is positioned on the upper lid 4. This makes it possible to easily position the ejection prevention plate 5 on the upper lid 4.
  • FIG. 9 is a diagram showing an upper lid 4 and a ejection prevention plate 5 constituting the arc extinguishing device 100 according to the first embodiment.
  • FIG. 9 shows a state when the upper lid 4 and the ejection prevention plate 5 positioned by the upper lid 4 are viewed from above.
  • the plurality of holes 51 formed in the ejection prevention plate 5 include an elongated hole 51 and a circular hole 51.
  • the hole 51 which is a long hole, has a long shape in the left-right direction.
  • each of the elongated holes 51 is arranged on the hole 42.
  • the center of the hole 51 which is a long hole, coincides with the center of the hole 42.
  • a part of the plurality of holes 42 formed in the upper lid 4 is formed at a position overlapping the holes 51 which are elongated holes.
  • the number, position, and shape of the holes 51 formed in the ejection prevention plate 5 are arbitrary.
  • FIG. 10 is a fourth diagram for explaining the assembly of the arc extinguishing device 100 according to the first embodiment.
  • FIG. 10 shows a state when the heat-resistant sheet 6 is placed on the ejection prevention plate 5.
  • the heat-resistant sheet 6 functions to prevent high-temperature gas from being directly discharged from the inside of the arc-extinguishing chamber to the outside of the arc-extinguishing chamber.
  • the two heat-resistant sheets 6 have the same shape as each other. Each heat-resistant sheet 6 is formed with a hole 60 through which a screw 7 is passed. Each heat-resistant sheet 6 is placed on the ejection prevention plate 5 with the positions of the holes 60 aligned with the corners of the ejection prevention plate 5. By mounting the two heat-resistant sheets 6, the entire region of the ejection prevention plate 5 exposed above is covered by the two heat-resistant sheets 6.
  • One of the two heat-resistant sheets 6 is fixed to the upper lid 4 by the screw 7 at the end on the end 41 side in the front-rear direction.
  • the other of the two heat-resistant sheets 6 is fixed by the screw 7 at the end opposite to the end 41 in the front-rear direction.
  • the portion not fixed to the upper lid 4 is pushed up by the gas from the inside of the arc extinguishing chamber through the holes 42 and 51 to the outside of the arc extinguishing chamber.
  • Each heat-resistant sheet 6 is opened and closed starting from a portion fixed by a screw 7 by receiving the pressure of gas inside the arc extinguishing chamber.
  • each heat-resistant sheet 6 When the portion of each heat-resistant sheet 6 that is not fixed to the upper lid 4 is pushed up, the gas is discharged from the inside of the arc extinguishing chamber to the outside of the arc extinguishing chamber. In this way, each heat-resistant sheet 6 functions to weaken the momentum of the gas discharged from the inside of the arc extinguishing chamber to the outside of the arc extinguishing chamber.
  • FIG. 11 is a fifth diagram for explaining the assembly of the arc extinguishing device 100 according to the first embodiment.
  • FIG. 11 shows a state when the upper lid 4 on which the ejection prevention plate 5 and the heat-resistant sheet 6 are arranged is placed on the lower lid 1 on which the arc-extinguishing iron plate 2 and the plurality of grids 3 are arranged.
  • the two locking portions 45 of the upper lid 4 are fitted to the positioning portion 18a of the lower lid 1, and the protrusion 49 of the upper lid 4 is fitted to the positioning portion 18b of the lower lid 1, so that the upper lid 4 is lowered.
  • the upper lid 4 After the upper lid 4 is placed on the lower lid 1, the upper lid 4 is fixed to the lower lid 1 by tightening the screw 7. Further, the heat-resistant sheet 6 and the ejection prevention plate 5 are fixed to the upper lid 4.
  • the arc extinguishing device 100 is configured by combining the lower lid 1, the arc extinguishing iron plate 2, the plurality of grids 3, the upper lid 4, the ejection prevention plate 5, and the two heat resistant sheets 6 with each other.
  • the arc extinguishing device 100 is positioned in the circuit breaker by fitting each of the locking portion 15 of the lower lid 1 and the two locking portions 45 of the upper lid 4 to the circuit breaker.
  • the arc extinguishing device 100 is fixed to the circuit breaker by a screw 8 passed through the hole 47 of the upper lid 4 and the hole 16 of the lower lid 1.
  • the arc extinguishing device 100 is mounted on the circuit breaker in a state where each component is integrated with each other.
  • each of the plurality of grids 3 By inserting each of the plurality of grids 3 into the lower lid 1 and then attaching the upper lid 4 to the lower lid 1, a unit structure having the plurality of grids 3 arranged in the arc extinguishing chamber can be obtained.
  • the grids 3 By inserting each of the plurality of grids 3 into the holding groove 11, the grids 3 can be arranged at regular intervals and at appropriate positions. Further, each grid 3 is held at an appropriate position without falling off by the upper lid 4 and the holding groove 11.
  • the heat-resistant sheet 6 may be attached to the arc extinguishing device 100 as needed. The heat-resistant sheet 6 may not be attached to the arc extinguishing device 100.
  • Each component of the arc extinguishing device 100 can be disassembled by the reverse procedure of assembling the arc extinguishing device 100. Since the arc extinguishing device 100 is assembled by fixing with the screw 7 and fitting each component, the arc extinguishing device 100 is disassembled into each component by removing the screw 7 and removing each component. To. As a result, the arc extinguishing device 100 can be easily disassembled into each component.
  • FIG. 12 is a diagram for explaining a first step in the method of manufacturing the arc extinguishing device 100 according to the first embodiment.
  • the first step is a step of attaching the arc extinguishing iron plate 2 to the lower lid 1.
  • the arc-extinguishing iron plate 2 is slid between the holding groove 11 of the first side wall 10a and the holding groove 11 of the second side wall 10b, so that the holding groove 11 and the second side wall 10a are seconded.
  • the arc extinguishing iron plate 2 is inserted into the holding groove 11 of the side wall 10b.
  • the arc-extinguishing iron plate 2 is attached to the lower lid 1 by sliding the protrusion 23 in the holding groove 11 and inserting the protrusion 23 into the holding groove 11.
  • FIG. 13 is a first diagram for explaining a second step in the method of manufacturing the arc extinguishing device 100 according to the first embodiment.
  • FIG. 14 is a second diagram for explaining a second step in the method of manufacturing the arc extinguishing device 100 according to the first embodiment.
  • the second step is a step of attaching a plurality of grids 3 to the lower lid 1.
  • the holding groove 11 of the first side wall 10a and the second side wall 10b are obtained by sliding the grid 3 in the holding groove 11 of the first side wall 10a and the holding groove 11 of the second side wall 10b.
  • the grid 3 is inserted into the holding groove 11 of the above.
  • Each grid 3 is attached to the lower lid 1 by sliding the protrusion 31 in the holding groove 11 and inserting the protrusion 31 into the holding groove 11.
  • the plurality of grids 3 are attached so that the front and back sides of the grids 3 arranged in the front-rear direction are staggered.
  • the grids 3 in which the positions of the tip portions 30a of the notches 30 are different from each other in the left-right direction are alternately arranged.
  • FIG. 15 is a diagram for explaining a third step in the manufacturing method of the arc extinguishing device 100 according to the first embodiment.
  • the third step is a step of attaching the ejection prevention plate 5 to the upper lid 4.
  • the ejection prevention plate 5 is inserted between the surface 40 and the protrusion 43 by sliding the ejection prevention plate 5 between the surface 40 and the protrusion 43.
  • the ejection prevention plate 5 is inserted from the end 41 to the inside of the edge portion 48, and the ejection prevention plate 5 is attached to the upper lid 4 by sliding the ejection prevention plate 5 in the insertion direction on the surface 40.
  • the protrusion 43 formed on the upper lid 4 functions to prevent the ejection prevention plate 5 from coming off from the upper lid 4.
  • FIG. 16 is a diagram for explaining a fourth step in the method of manufacturing the arc extinguishing device 100 according to the first embodiment.
  • the fourth step is a step of placing the upper lid 4 covering the plurality of grids 3 on the lower lid 1.
  • the two locking portions 45 of the upper lid 4 are fitted to the positioning portion 18a of the lower lid 1, and the protrusion 49 of the upper lid 4 is the positioning portion 18b of the lower lid 1. It is fitted to.
  • the upper lid 4 is positioned on the lower lid 1.
  • two heat-resistant sheets 6 are placed on the ejection prevention plate 5.
  • FIG. 17 is a diagram for explaining a fifth step in the method of manufacturing the arc extinguishing device 100 according to the first embodiment.
  • the fifth step is a step of fastening the lower lid 1, the upper lid 4, the ejection prevention plate 5, and the heat-resistant sheet 6 to each other with screws 7.
  • the fourth step and the fifth step are steps of attaching the upper lid 4 to the lower lid 1.
  • the heat-resistant sheet 6 and the ejection prevention plate 5 are fixed to the upper lid 4.
  • the screw hole in which the screw 7 is tightened in the lower lid 1 has a shape that does not allow the screw 7 to penetrate.
  • the arc extinguishing device 100 which is a unit structure composed of the lower lid 1, the arc extinguishing iron plate 2, the plurality of grids 3, the upper lid 4, the ejection prevention plate 5, and the two heat resistant sheets 6, is manufactured.
  • the arc extinguishing device 100 arranged at various positions can be easily manufactured.
  • the arc extinguishing device 100 When the arc extinguishing device 100 is attached to the circuit breaker, first, the locking portion 15 of the lower lid 1 and the locking portion 45 of the upper lid 4 are fitted to the circuit breaker. Then, the arc extinguishing device 100 is fastened to the circuit breaker by the screw 8 passed through the hole 47 of the upper lid 4 and the hole 16 of the lower lid 1. As a result, the arc extinguishing device 100 is fixed to the circuit breaker.
  • each component of the arc extinguishing device 100 constitutes a unit structure that can be removed from the circuit breaker in a state of being integrated with each other and can be attached to the circuit breaker in a state of being integrated with each other.
  • the arc extinguishing device 100 has the effect that it can be easily removed from the circuit breaker and attached to the circuit breaker.
  • the arc extinguishing device 100 can be replaced or the arc extinguishing device 100 can be maintained. Workability can be improved.
  • FIG. 18 is a diagram showing an upper lid 4, a ejection prevention plate 5, and a heat-resistant sheet 6A constituting the arc extinguishing device 100 according to the second embodiment.
  • the same parts as those in the first embodiment are designated by the same reference numerals, and a configuration different from that of the first embodiment will be mainly described.
  • the heat-resistant sheet 6A which is a modification of the heat-resistant sheet 6, is inserted into the upper lid 4 in the same manner as the ejection prevention plate 5.
  • one heat-resistant sheet 6A is attached to the arc extinguishing device 100.
  • the heat-resistant sheet 6A is a rectangular plate part.
  • FIG. 18 shows how the heat-resistant sheet 6A is inserted into the upper lid 4 to which the ejection prevention plate 5 is attached.
  • the heat-resistant sheet 6A is passed through a gap between each protrusion 43 and the surface 40.
  • the heat-resistant sheet 6A has a movable portion 61 which is a portion which is cut openable by receiving the pressure of the gas discharged from the inside of the arc extinguishing device 100 to the outside of the arc extinguishing device 100.
  • the heat-resistant sheet 6A is formed with three movable portions 61, each of which can be opened and closed by receiving the pressure of gas.
  • the number and shape of the movable portions 61 formed on the heat-resistant sheet 6A are arbitrary.
  • the heat-resistant sheet 6A can be detachably attached to the upper lid 4 by sliding it in the same manner as the ejection prevention plate 5.
  • the holding groove 11 into which the arc extinguishing iron plate 2 or the grid 3 is inserted is formed in each of the surface of the first side wall 10a and the surface of the second side wall 10b. Not limited. A plurality of convex structures are provided on each of the surface of the first side wall 10a and the surface of the second side wall 10b, and the arc-extinguishing iron plate 2 or the grid 3 is inserted into the groove between the structures.
  • the holding groove 11 may be used.
  • the arc extinguishing iron plate 2 may not be provided with the protrusion 23, and the arc extinguishing iron plate 2 may be held by the lower lid 1 by inserting the edge portion of the arc extinguishing iron plate 2 into the holding groove 11. ..
  • the grid 3 may not be provided with the protrusion 31, and the grid 3 may be held by the lower lid 1 by inserting the edge portion of the grid 3 into the holding groove 11.
  • the shapes of the lower lid 1, the arc-extinguishing iron plate 2, the grid 3, the upper lid 4, the ejection prevention plate 5, and the heat-resistant sheets 6 and 6A are not limited to the shapes described in the first or second embodiment. Each shape can be appropriately determined so as to simplify the structure of the jig such as a mold for manufacturing. Further, the number of the holding groove 11, the notch 12, the guide shape portion 17, the positioning portion 18a, 18b, the arc extinguishing iron plate 2, the grid 3, the protrusions 23, 31, 43, the holes 44, and the screws 7, 8 is carried out. The number is not limited to the number described in the first or second form, and can be appropriately determined. The number of grids 3 and the distance between the grids 3 can be appropriately determined according to the magnitude of the generated arc.
  • FIG. 19 is a first diagram showing an upper lid 4 and a ejection prevention plate 5A constituting the arc extinguishing device 100 according to the third embodiment.
  • FIG. 20 is a second view showing the upper lid 4 and the ejection prevention plate 5A constituting the arc extinguishing device 100 according to the third embodiment.
  • the same parts as those in the first or second embodiment are designated by the same reference numerals, and the configuration different from the first or second embodiment will be mainly described.
  • the ejection prevention plate 5A which is a modification of the ejection prevention plate 5, is attached to the upper lid 4 in a state of being inserted between the surface 40 and each protrusion 43 of the edge portion 48, similarly to the ejection prevention plate 5.
  • FIG. 19 shows a state when the ejection prevention plate 5A is inserted into the upper lid 4.
  • FIG. 20 shows a state when the upper lid 4 and the ejection prevention plate 5A positioned by the upper lid 4 are viewed from above.
  • the ejection prevention plate 5A is formed with a plurality of holes 51A for discharging the gas inside the arc extinguishing chamber to the outside of the arc extinguishing chamber.
  • the position or shape of the hole 51A of the ejection prevention plate 5A is adjusted according to the current region of the current cut off by the arc extinguishing device 100.
  • Either the heat-resistant sheet 6 described in the first embodiment or the heat-resistant sheet 6A described in the second embodiment may be arranged on the ejection prevention plate 5A.
  • each of the plurality of holes 51A formed in the ejection prevention plate 5A is circular.
  • the plurality of holes 51A formed in the ejection prevention plate 5A do not include elongated holes.
  • each hole 51A of the ejection prevention plate 5A is located between the holes 42 of the upper lid 4 in a state where the ejection prevention plate 5A is attached to the upper lid 4.
  • the hole 51A of the ejection prevention plate 5A is formed at a position where the hole 51A of the ejection prevention plate 5A does not overlap with the hole 42 of the upper lid 4 when the ejection prevention plate 5A is attached to the upper lid 4. That is, the position and shape of the hole 51A are adjusted so that the hole 51A does not overlap with the hole 42.
  • the gas inside the arc extinguishing chamber goes out of the arc extinguishing chamber through the hole 42 of the upper lid 4 and the hole 51A of the ejection prevention plate 5A.
  • the position and shape of the hole 51A are adjusted for the purpose of ensuring the gas pressure inside the arc extinguishing chamber when the low current is cut off or releasing the gas pressure when the high current is cut off.
  • the position and shape of the hole 51A are adjusted so that the hole 42 and the hole 51A do not overlap each other. That is, the holes 51A are arranged between the holes 42, and the holes 42 are arranged between the holes 51A.
  • the arc extinguishing device 100 can cut off the current according to the current region, and the gas pressure inside the arc extinguishing chamber is secured.
  • the gas pressure inside the arc extinguishing chamber is controlled according to the current region by adjusting at least one of the position and the shape of the hole 51A according to the current region. ..
  • the arc extinguishing device 100 can improve the breaking performance in each current region.
  • the hole 51A of the ejection prevention plate 5A and the hole 42 of the upper lid 4 may have a portion that overlaps with each other. At least a part of the plurality of holes 51A formed in the ejection prevention plate 5A may have a portion overlapping with the hole 42 of the upper lid 4.
  • Each hole 51A of the ejection prevention plate 5A may be such that the center of the hole 51A is located between the holes 42 of the upper lid 4 in a state where the ejection prevention plate 5A is attached to the upper lid 4.
  • the gas pressure inside the arc extinguishing chamber is controlled by adjusting the position of the center of the hole 51A or the size of the hole 51A. By adjusting the position or shape of the hole 51A, the arc extinguishing device 100 can improve the breaking performance in each current region.
  • the area of the portion of the hole 51A that does not overlap with the hole 42 is larger than the area of the portion of the hole 51A that overlaps with the hole 42.
  • the position and shape are adjusted. The smaller the area of the portion of the hole 51A that overlaps with the hole 42, the more the arc extinguishing device 100 can maintain a high gas pressure inside the arc extinguishing chamber.
  • the positional relationship between the hole 42 and the hole 51A, the shape of the hole 42, or the shape of the hole 51A can be appropriately set according to the current region.
  • the gas pressure inside the arc extinguishing chamber is changed by changing the position of the hole 51A or the shape of the hole 51A in the ejection prevention plate 5A without changing the upper lid 4. Can be easily adjusted.
  • each of the above embodiments shows an example of the contents of the present disclosure.
  • the configurations of each embodiment can be combined with other known techniques.
  • the configurations of the respective embodiments may be appropriately combined. It is possible to omit or change a part of the configuration of each embodiment without departing from the gist of the present disclosure.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
PCT/JP2021/045269 2020-12-10 2021-12-09 消弧装置および消弧装置の製造方法 WO2022124360A1 (ja)

Priority Applications (2)

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CN202180080275.9A CN116569299A (zh) 2020-12-10 2021-12-09 消弧装置及消弧装置的制造方法
JP2022568324A JP7378643B2 (ja) 2020-12-10 2021-12-09 消弧装置および消弧装置の製造方法

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JP2020205169 2020-12-10
JP2020-205169 2020-12-10

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WO2022124360A1 true WO2022124360A1 (ja) 2022-06-16

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JP (1) JP7378643B2 (enrdf_load_stackoverflow)
CN (1) CN116569299A (enrdf_load_stackoverflow)
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5099461U (enrdf_load_stackoverflow) * 1974-01-18 1975-08-18
JPS6341845U (enrdf_load_stackoverflow) * 1986-09-03 1988-03-18
JPH0170226U (enrdf_load_stackoverflow) * 1987-10-29 1989-05-10
JPH08227648A (ja) * 1994-06-14 1996-09-03 Fuji Electric Co Ltd 回路遮断器
JPH09171760A (ja) * 1996-12-26 1997-06-30 Hitachi Ltd 回路遮断器
US20100258531A1 (en) * 2007-11-21 2010-10-14 Abb S.P.A. Arc chamber for a switching device, and switching device comprising said arc chamber

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009158319A (ja) * 2007-12-27 2009-07-16 Tempearl Ind Co Ltd 回路遮断器の消弧装置
CN210296265U (zh) * 2019-09-26 2020-04-10 法泰电器（江苏）股份有限公司 新型固定式断路器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5099461U (enrdf_load_stackoverflow) * 1974-01-18 1975-08-18
JPS6341845U (enrdf_load_stackoverflow) * 1986-09-03 1988-03-18
JPH0170226U (enrdf_load_stackoverflow) * 1987-10-29 1989-05-10
JPH08227648A (ja) * 1994-06-14 1996-09-03 Fuji Electric Co Ltd 回路遮断器
JPH09171760A (ja) * 1996-12-26 1997-06-30 Hitachi Ltd 回路遮断器
US20100258531A1 (en) * 2007-11-21 2010-10-14 Abb S.P.A. Arc chamber for a switching device, and switching device comprising said arc chamber

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JP7378643B2 (ja) 2023-11-13
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