WO2020202558A1 - Circuit breaker - Google Patents

Circuit breaker Download PDF

Info

Publication number
WO2020202558A1
WO2020202558A1 PCT/JP2019/015167 JP2019015167W WO2020202558A1 WO 2020202558 A1 WO2020202558 A1 WO 2020202558A1 JP 2019015167 W JP2019015167 W JP 2019015167W WO 2020202558 A1 WO2020202558 A1 WO 2020202558A1
Authority
WO
WIPO (PCT)
Prior art keywords
arc
side plate
core
circuit breaker
pair
Prior art date
Application number
PCT/JP2019/015167
Other languages
French (fr)
Japanese (ja)
Inventor
中川　淳
伸郎 三好
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 CN201980094767.6A priority Critical patent/CN113632193A/en
Priority to JP2021511059A priority patent/JP7076635B2/en
Priority to PCT/JP2019/015167 priority patent/WO2020202558A1/en
Publication of WO2020202558A1 publication Critical patent/WO2020202558A1/en

Links

Images

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

Definitions

  • the present invention relates to a circuit breaker having a built-in arc extinguishing device that extinguishes an arc generated between contacts.
  • Patent Document 1 provides a technique for providing a magnetic yoke and a permanent magnet in a circuit breaker including a plurality of magnetic grids stacked at intervals from each other and an arc runner that guides an arc to a wide part of a space. It is disclosed. With such a magnetic yoke and a permanent magnet, the magnitude of the magnetic field acting on the arc can be increased.
  • Patent Document 1 when the technique described in Patent Document 1 is applied to a circuit breaker that is required to be able to cut off a small current of several tens of amperes to a large current of several kiloamperes a predetermined number of times, it drives an arc. There is a possibility that the size will increase if sufficient driving force is to be obtained.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a circuit breaker capable of cope with a high voltage while suppressing an increase in size.
  • the circuit breaker of the present invention includes a conductive member, a movable contactor, a grid portion, a core, an arc runner, and a permanent magnet.
  • the conductive member is provided with a fixed contact on one end side and a power supply side terminal on the other end side.
  • the movable contact is provided with a movable contact facing the fixed contact.
  • the grid portion has a plurality of grid plates that extinguish the arc generated between the fixed contact and the movable contact.
  • the core has a pair of side plate portions facing each other, and a grid portion is arranged between the pair of side plate portions.
  • the arcranna is connected to the conductive member and drives the arc.
  • two magnetic poles having different polarities are arranged in the direction in which the movable contacts face the grid portion or in the direction in which the pair of side plate portions face each other.
  • circuit breaker according to the embodiment of the present invention will be described in detail below with reference to the drawings.
  • the present invention is not limited to this embodiment.
  • FIG. 1 is a side sectional view showing the entire circuit breaker according to the first embodiment of the present invention.
  • a three-dimensional Cartesian coordinate system including the Z axis whose positive direction is upward on the paper is shown.
  • Such a Cartesian coordinate system is also shown in other drawings used in the following description, and when only a part of the circuit breaker configuration is illustrated, the X-axis, Y-axis, and Z-axis directions are shown in the figure. This is the direction shown in 1, that is, the state in which the circuit breaker is assembled.
  • the circuit breaker 100 includes an insulating housing 1, a plurality of circuit breaker units 2, an opening / closing mechanism unit 3, and a crossbar 4.
  • the housing 1 has a base 11 and a cover 12, each of which is made of an insulating material.
  • a plurality of circuit cutoff units 2 and an opening / closing mechanism unit 3 are arranged on the base 11.
  • the cover 12 covers a plurality of circuit cutoff units 2 and an opening / closing mechanism 3 arranged on the base 11.
  • a handle window hole (not shown) is formed in the cover 12, and the operation handle 27 of the opening / closing mechanism portion 3 projects from the handle window hole.
  • the plurality of circuit cutoff units 2 are arranged on the base 11 at intervals from each other. These plurality of circuit cutoff units 2 have the same configuration as each other. Such a circuit breaker unit 2 is provided for the number of electric circuits cut by the circuit breaker 100.
  • Each circuit cutoff unit 2 includes a movable contact 21, a movable contact holder 22, a tripping device 23, a load-side conductor 24, and an arc extinguishing unit 25.
  • the arc extinguishing unit 25 includes a fixed contact 60.
  • the base end of the movable contact 21 is rotatably supported by the crossbar 4, and the movable contact 26 is provided at the tip.
  • the fixed contact 60 is provided with a fixed contact 71 at which the movable contact 26 contacts and opens at one end, and a power supply side terminal 72 connected to the power supply side conductor at the other end.
  • the tripping device 23 is provided between the movable contact 21 and the load-side conductor 24, and drives a trip bar (not shown) in the opening / closing mechanism portion 3 when an overcurrent flows.
  • the tripping device 23 is connected to the movable contact 21 via the movable contact holder 22.
  • the opening / closing mechanism portion 3 is arranged on the base 11, and includes, for example, a well-known toggle link mechanism and a well-known trip bar.
  • the opening / closing mechanism 3 puts the circuit breaker 100 in a trip state when the trip bar is driven by the trip device 23.
  • the crossbar 4 extends along the arrangement direction of the plurality of circuit breaking units 2, and is attached to the base end of the movable contact 21 provided in each circuit breaking unit 2.
  • the crossbar 4 is rotated about the axis of the crossbar 4 by the opening / closing mechanism portion 3.
  • the movable contact 21 of each circuit cutoff unit 2 rotates in conjunction with the rotation of the crossbar 4 by the opening / closing mechanism 3, and the rotation of the movable contact 21 causes the movable contact 26 to come into contact with the fixed contact 71.
  • the movable contact 26 may be separated from the fixed contact 71.
  • the fixed contact 71 and the movable contact 26 form an opening / closing contact that opens / closes the electric path.
  • the electric circuit is connected, and the electric circuit is turned on via the power supply side terminal 72 and the load side conductor 24. Further, when the movable contact 26 is separated from the fixed contact 71, the electric circuit is cut off, and the electric circuit including the power supply side terminal 72 and the load side conductor 24 in the electric circuit is turned off.
  • the arc extinguishing unit 25 includes the fixed contactor 60 and extinguishes the arc generated when the electric path is cut off.
  • the arc extinguishing unit 25 will be specifically described.
  • FIG. 2 is an exploded perspective view of the arc extinguishing unit according to the first embodiment.
  • FIG. 3 is an external perspective view of the arc extinguishing unit according to the first embodiment.
  • the arc extinguishing unit 25 is arranged around the arc extinguishing device 30 and the arc extinguishing device 30 for extinguishing the arc generated between the fixed contact 71 and the movable contact 26 at the time of interruption. It is provided with a core 40 made of a magnetic material. Further, the arc extinguishing unit 25 is provided so as to surround the arc extinguishing device 30, and is provided with an insulating member 50 that insulates between the arc extinguishing device 30 and the core 40, and a fixed contact 71 and a power supply side terminal 72. It has a child 60.
  • FIG. 4 is an exploded perspective view showing an arc extinguishing device in a state where the mover stopper according to the first embodiment is removed.
  • the arc extinguishing device 30 has a grid portion 31 having a plurality of grid plates 34 each composed of a magnetic steel plate and a plurality of grid plates 34 each formed of an insulating material so as to be spaced from each other. It has a pair of support plates 32 that support it.
  • Each grid plate 34 is provided with a U-shaped notch 35 on one side of a square magnetic steel plate, and side foot portions 34a are formed on both sides of the notch 35.
  • the U-shaped notch 35 is formed in a region of the grid plate 34 facing the movable contact 21, and a movable contact 26 is provided in the space formed by the U-shaped notch 35.
  • the tip of the contact 21 rotates about the crossbar 4 as a central axis.
  • each grid plate 34 Both ends of each grid plate 34 are inserted into through holes (not shown) formed in the support plate 32, and are plastically deformed so that the crimped portion 34b at the tip expands. As a result, each grid plate 34 is held by the support plate 32. Further, the arc extinguishing device 30 has a mover stopper 33 whose base end is rotatably supported by a pair of support plates 32. In the example shown in FIG. 4, the state in which the mover stopper 33 is removed from the arc extinguishing device 30 is shown.
  • FIG. 5 is a side view of the fixed contact according to the first embodiment.
  • FIG. 6 is a plan view of the fixed contact according to the first embodiment.
  • the fixed contact 60 is an arc runner in which the fixed contact 71 is arranged on the upper surface of the conductive member 70 and the fixed contact 71 is arranged on the upper surface of the conductive member 70 and is electrically connected to the conductive member 70.
  • One end of the conductive member 70 is connected to the power supply side terminal 72 and one end is connected to the first electric path 73 extending downward in the direction toward the base 11, and one end is connected to the other end of the first electric path 73 toward the movable contact 21. It has a pair of second conductors 74 extending in the direction. Further, the conductive member 70 is continuous with the third electric circuit 75 whose one end is connected to the other ends of the pair of second electric circuits 74 and one end of the third electric circuit 75, and extends in the direction toward the power supply side terminal 72.
  • the electric circuit 76 is provided.
  • a fixed contact 71 is provided on the upper surface of the base end portion of the fourth electric path 76. Further, the fourth electric line 76 is arranged between the pair of second electric lines 74 at a distance from the pair of second electric lines 74, and extends along the pair of second electric lines 74.
  • the arcranna 80 extends in a direction from the base end arranged on the upper surface of the base end portion of the fourth electric path 76 toward the bottom surface of the base 11, and then bends in the middle portion in a direction along the bottom surface of the base 11 to supply power. It extends in the direction toward the side terminal 72.
  • the permanent magnet 81 is arranged below the tip of the arc runner 80 in the space 77 between the pair of second electric paths 74.
  • the second electric path 74 has a parallel electric path 74a having one end connected to the other end of the first electric path 73 and extending on the base 11 along the bottom surface of the base 11, and one end connected to the other end of the parallel electric path 74a. It has an inclined electric circuit 74b extending obliquely with respect to the bottom surface of the base 11 toward 71. Further, the second electric line 74 has a connecting electric line 74c that is continuous with the other end of the inclined electric line 74b and extends to the third electric line 75.
  • the fixed contact 60 has an arc runner 80 arranged on the upper surface of the conductive member 70 provided with the fixed contact 71 and the load side conductor 24, and the permanent magnet 81 is arranged below the arc runner 80.
  • FIG. 7 is a plan view of the core according to the first embodiment.
  • FIG. 8 is a side view of the core according to the first embodiment.
  • the core 40 has a pair of side plate portions 41 and a shield portion 42 connecting one ends of the pair of side plate portions 41, and is composed of a magnetic material.
  • the shield portion 42 is provided between the first electric path 73 and the arc runner 80 so as to cover the fixed contact 71 side of the first electric path 73.
  • the shield portion 42 shields the magnetic field generated around the arc runner 80 by the current flowing through the first electric circuit 73.
  • the pair of side plate portions 41 are arranged above the parallel electric circuit 74a, and have an effect of concentrating the magnetic flux generated by the current flowing in the parallel electric circuit 74a on the pair of side plate portions 41 and reducing the magnetic field near the arc runner 80.
  • FIG. 9 is a plan view of the insulating member according to the first embodiment.
  • FIG. 10 is a side view of the insulating member according to the first embodiment.
  • FIG. 11 is an external perspective view of the insulating member according to the first embodiment.
  • FIG. 12 is a side sectional view showing a positional relationship between the insulating member, the grid portion, the core, and the fixed contact according to the first embodiment.
  • the insulating member 50 is continuous with the pair of side portions 51 facing each other and the bottom end of the base 11 in the corresponding side portions 51 of the pair of side portions 51. It has a pair of cover portions 52 that extend along the bottom surface of the base 11.
  • the pair of side portions 51 are arranged between each of the pair of side plate portions 41 and the arc extinguishing device 30, and insulate between each of the pair of side plate portions 41 and the arc extinguishing device 30.
  • the pair of cover portions 52 are arranged between the second electric circuit 74 of the conductive member 70 and the grid portion 31 of the arc extinguishing device 30, and the arc extinguishing device 30 is provided so that the second electric circuit 74 is not exposed to the grid portion 31 side. cover.
  • the insulating member 50 has a shield portion cover 53 that connects the ends of the pair of side portions 51 on the power supply side terminal 72 side.
  • the shield portion cover 53 is arranged between the shield portion 42 of the core 40 and the grid portion 31 so that the shield portion 42 of the core 40 is not exposed to the grid portion 31 side. Cover.
  • the arc runner 80 is electrically connected to the conductive member 70 by being attached to the conductive member 70 by a conductive screw 78 or the like.
  • FIG. 13 is a side sectional view showing a part of the configuration of the arc extinguishing unit according to the first embodiment.
  • FIG. 14 is a side sectional view of the arc extinguishing unit shown in FIG. 13 in which the grid portion and the insulating member are not shown.
  • FIG. 15 is a plan view showing a configuration example of a part of the arc extinguishing unit according to the first embodiment.
  • the support plate 32 and the mover stopper 33 of the grid portion 31 are not shown.
  • the permanent magnet 81 has an N pole 81a and an S pole 81b, the N pole 81a is arranged on the fixed contact 71 side, and the S pole 81b is arranged on the power supply side terminal 72 side.
  • the direction 92 of the magnetic field is as shown in FIG. That is, the magnetic field flows from the north pole 81a through the arc runner 80 and the fourth electric circuit 76, from the arc runner 80 and the fourth electric circuit 76 through the gap to the pair of side plate portions 41 in the core 40, and further through the shield portion 42 of the core 40. Return to the S pole 81b.
  • the direction 91 in which the current flows is the Z-axis negative direction as shown in FIG.
  • the driving direction 93 which is the direction in which the arc is driven, is the direction shown in FIG. 15 according to Fleming's left-hand rule.
  • the magnitude of the magnetic field acting on the arc can be increased by arranging the permanent magnet 81, and the grid portion 31 is located between the pair of side plate portions 41 of the core 40. Is placed. As a result, the magnetic flux can be concentrated inside the core 40. Therefore, the arc can be efficiently driven by the grid portion 31, and the arc can be maintained in the grid portion 31 and extinguished.
  • the permanent magnet 81 is arranged below the arc runner 80, the arc does not directly hit the permanent magnet 81. Therefore, it is possible to suppress the thermal demagnetization due to the arc in the permanent magnet 81, and it is possible to suppress the reduction of the driving force of the arc by the grid portion 31 due to the thermal demagnetization.
  • FIG. 16 is a plan view showing another configuration example of the arc extinguishing unit according to the first embodiment.
  • the grid portion 31 is arranged between the pair of side plate portions 41 of the core 40. Therefore, the magnetic flux can be concentrated inside the core 40. Therefore, the arc can be efficiently driven by the grid portion 31, and the arc can be maintained in the grid portion 31 and extinguished.
  • the magnetic field acting on the arc can be increased as compared with the case where the permanent magnet 81 is arranged below the tip of the arc runner 80.
  • the amount of wear of the movable contact 26 and the fixed contact 71 at the time of interruption can be reduced.
  • thermal demagnetization due to the arc can be suppressed in the permanent magnet 81. Therefore, it is possible to prevent the grid portion 31 from reducing the driving force of the arc.
  • the circuit breaker 100 includes a conductive member 70, a movable contactor 21, a grid portion 31, a core 40, an arc runner 80, and a permanent magnet 81.
  • the conductive member 70 is provided with a fixed contact 71 on one end side and a power supply side terminal 72 on the other end side.
  • the movable contact 21 is provided with a movable contact 26 facing the fixed contact 71.
  • the grid portion 31 has a plurality of grid plates 34 that extinguish the arc generated between the fixed contact 71 and the movable contact 26.
  • the core 40 has a pair of side plate portions 41 facing each other, and a grid portion 31 is arranged between the pair of side plate portions 41.
  • the arcranna 80 is connected to the conductive member 70 and drives the arc.
  • the permanent magnet 81 two poles 81a and S poles 81b, which are two magnetic poles having different polarities in the direction in which the movable contact 21 faces the grid portion 31, are arranged.
  • the magnetic flux can be concentrated inside the core 40, the arc can be efficiently driven toward the grid portion 31, and the arc can be maintained in the grid portion 31 and extinguished. Therefore, it is possible to cope with the increase in voltage while suppressing the increase in size of the circuit breaker 100.
  • the permanent magnet 81 is arranged below the arc runner 80 when the direction from the movable contact 26 to the fixed contact 71 is downward. As a result, the permanent magnet 81 can suppress thermal demagnetization due to the arc, so that it is possible to suppress a decrease in the driving force of the arc by the arc extinguishing device 30.
  • the arc-extinguishing unit according to the second embodiment is a core in that the core is formed by two divided cores so that the core has an opening in a part arranged between the grid portion and the power supply side terminal.
  • the same components as those of the arc extinguishing unit 25 according to the first embodiment will be designated by the same reference numerals and the description thereof will be omitted, and the configurations different from those of the arc extinguishing unit 25 according to the first embodiment will be mainly described. And.
  • FIG. 17 is a plan view showing a configuration example of a part of the arc extinguishing unit of the circuit breaker according to the second embodiment of the present invention.
  • the arc-extinguishing unit 25A of the circuit breaker 100A according to the second embodiment has the core 40A instead of the core 40, and the circuit breaker 100 according to the first embodiment extinguishes the arc.
  • the circuit breaker 100A has the same configuration as the circuit breaker 100 except for the arc extinguishing unit 25A, and is not shown.
  • the core 40A has a first split core 43a and a second split core 43b.
  • the first divided core 43a has a side plate portion 41a and a first protruding portion 42a projecting in the positive direction of the X axis, which is a direction approaching the second divided core 43b from the end portion of the side plate portion 41a.
  • the second divided core 43b has a side plate portion 41b and a second protruding portion 42b projecting in the negative X-axis direction from the end portion of the side plate portion 41b toward the first divided core 43a.
  • the pair of side plate portions 41a and 41b have the same configuration as the pair of side plate portions 41 according to the first embodiment. That is, the pair of side plate portions 41a and 41b face each other, and the grid portion 31 is arranged between the pair of side plate portions 41a and 41b.
  • the first protruding portion 42a and the second protruding portion 42b face each other in the opposite directions of the pair of side plate portions 41a and 41b, and are arranged between the grid portion 31 and the power supply side terminal 72. Similar to the shield portion 42, the first protrusion 42a and the second protrusion 42b have a function of shielding the magnetic field generated around the arc runner 80 by the current flowing through the first electric circuit 73. Further, an opening 44 is formed between the first protruding portion 42a and the second protruding portion 42b, whereby an excessive increase in pressure inside the circuit breaker 100A can be prevented.
  • the tripping device 23 shown in FIG. 1 acts on the opening / closing mechanism portion 3 to put the movable contact 21 in the trip state. At this time, a current of several kiloamperes may flow in the circuit.
  • the electric circuit is cut off while a current of several kiloamperes is flowing, the magnitude of the magnetic field generated by the arc is sufficiently large, so that the arc is driven to the arc extinguishing device 30 without using the magnetic field of the permanent magnet 81. ..
  • the core 40A may be deformed depending on the strength of the core 40A, and the housing 1 may be deformed. Depending on the strength, the housing 1 may be damaged.
  • the opening 44 is formed between the first protrusion 42a and the second protrusion 42b, it is possible to accurately prevent the occurrence of an excessive pressure rise inside the circuit breaker 100A. Can be done.
  • FIG. 18 is a cross-sectional view showing another configuration example of the core according to the second embodiment.
  • the core 40A shown in FIG. 18 includes a pair of side plate portions 41a and 41b, and a shield portion 42A that connects the end portion of the side plate portion 41a and the end portion of the side plate portion 41b.
  • An opening 44 which is a through hole, is formed in the shield portion 42A.
  • the shield portion 42A has the same function as the shield portion 42.
  • the opening 44 formed in the shield portion 42A is formed by a round hole, but the shape of the opening 44 is not limited to the round hole. Further, the number of openings 44 may be 2 or more. Further, when a plurality of openings 44 are formed in the shield portion 42A, the shapes of the openings 44 may be different from each other.
  • the core 40A of the arc extinguishing unit 25A according to the second embodiment is arranged between the grid portion 31 and the power supply side terminal 72, and has a region having an opening 44 in a part thereof. As a result, it is possible to accurately prevent the occurrence of an excessive pressure rise inside the circuit breaker 100A.
  • the core 40A includes a first split core 43a and a second split core 43b.
  • the first divided core 43a has a side plate portion 41a and a first protruding portion 42a that protrudes from the end portion of the side plate portion 41a in a direction approaching the side plate portion 41b.
  • the second divided core 43b has a side plate portion 41b and a second protruding portion 42b that protrudes from the end portion of the side plate portion 41b in a direction approaching the side plate portion 41a.
  • the first protruding portion 42a and the second protruding portion 42b face each other in the opposite directions of the pair of side plate portions 41a and 41b.
  • An opening 44 is formed between the first protrusion 42a and the second protrusion 42b. As a result, the opening 44 that prevents the occurrence of an excessive pressure rise inside the circuit breaker 100A can be formed.
  • Embodiment 3 The arc-extinguishing unit according to the third embodiment is different from the arc-extinguishing unit 25A according to the second embodiment in the position of the permanent magnet and the direction of the magnetic poles.
  • the same components as those of the arc-extinguishing unit 25A according to the second embodiment will be designated by the same reference numerals and the description thereof will be omitted, and the configurations different from the arc-extinguishing unit 25A according to the second embodiment will be mainly described. And.
  • FIG. 19 is a plan view showing a configuration example of a part of the arc extinguishing unit of the circuit breaker according to the third embodiment of the present invention.
  • the permanent magnet 81 is provided in the opening 44 formed between the first division core 43a and the second division core 43b. Be placed.
  • the north pole 81a and the south pole 81b are arranged in the direction in which the side plate portion 41a and the side plate portion 41b face each other. That is, the N pole 81a faces the first protruding portion 42a of the first split core 43a via a gap, and the S pole 81b faces the second protruding portion 42b of the second split core 43b via a gap.
  • the shortest distance between the N pole 81a of the permanent magnet 81 and the first split core 43a is "D1”
  • the shortest distance between the S pole 81b of the permanent magnet 81 and the second split core 43b is "D2”
  • the arc runner The shortest distance between the 80 and the permanent magnet 81 is defined as "D3”.
  • the permanent magnets 81 are arranged so as to satisfy D1 ⁇ D3 and D2 ⁇ D3.
  • the direction 91 in which the current flows is the Z-axis negative direction as shown in FIG.
  • the driving direction 93 which is the direction in which the arc is driven, is the direction shown in FIG. 19 according to Fleming's left-hand rule. That is, the arc is driven in the direction from the movable contact 26 and the fixed contact 71 toward the arc extinguishing device 30.
  • the arc runner 80 serves as an arc drive electric circuit, the arc runner 80 may be consumed depending on the magnitude of the current at the time of interruption, and the magnetic force may change due to a change in the magnetic resistance value of the arc runner 80.
  • the lines of magnetic force mainly pass through the core 40A due to the arrangement of the permanent magnets 81 shown in FIG. Since the core 40A does not wear due to interruption, the arc extinguishing unit 25B can stably apply a driving force to the arc.
  • the permanent magnets 81 are arranged in the X-axis direction in which the north pole 81a and the south pole 81b are in the direction in which the pair of side plate portions 41a and 41b face each other. Will be done. Further, in the permanent magnet 81, the distances D1 and D2 from each of the first protruding portion 42a and the second protruding portion 42b are shorter than the distance D3 from the arc runner 80. As a result, a magnetic field is formed from one of the pair of side plate portions 41a and 41b toward the other, and the magnetic field lines mainly pass through the core 40A. Therefore, the arc extinguishing unit 25B can stably apply a driving force to the arc.
  • the distances D1 and D2 can be shortened, and the arc extinguishing unit 25B can give a driving force to the arc more stably.
  • the configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

Abstract

The present invention provides a circuit breaker comprising an electroconductive member (70), a movable contact (21), a grid part (31), a core (40), an arc runner (80), and a permanent magnet (81). A fixed contact point (71) is provided on one end side of the electroconductive member (70) and a power supply-side terminal (72) is provided on the other end side of the electroconductive member (70). A movable contact point (26) is provided to the movable contact (21). The grid part (31) has a plurality of grid plates (34) for extinguishing an arc produced between the fixed contact point (71) and the movable contact point (26). The core (40) has a pair of side plate parts (41) facing each other, and the grid part (31) is disposed between the pair of side plate parts (41). The arc runner (80) is connected to the electroconductive member (70) and drives the arc. The permanent magnet (81) is configured so that an N pole (81a) and an S pole (81b) having different polarities are arranged in the direction in which the movable contact (21) faces the grid part (31) or in the direction in which the pair of side plate parts (41) face each other.

Description

回路遮断器Circuit breaker
　本発明は、接点間に生じるアークを消弧する消弧装置を内蔵した回路遮断器に関するものである。 The present invention relates to a circuit breaker having a built-in arc extinguishing device that extinguishes an arc generated between contacts.
　近年、直流電路の普及に伴い、電路を高電圧化して銅損を削減したいというニーズが高まっている。そのため、直流電路で使用される回路遮断器にも高電圧化の要求が増してきている。高い電圧の直流電路を遮断するためには、開閉接点の開離距離を長くすることが有効であるが、開閉接点の開離距離の長距離化は回路遮断器の大型化につながる。 In recent years, with the spread of DC electric circuits, there is an increasing need to increase the voltage of electric circuits to reduce copper loss. Therefore, there is an increasing demand for higher voltage in circuit breakers used in DC electric circuits. In order to cut off a high-voltage DC electric circuit, it is effective to increase the opening / closing distance of the opening / closing contact, but increasing the opening distance of the opening / closing contact leads to an increase in the size of the circuit breaker.
　そこで、例えば、特許文献１には、互いに間隔を空けて積層された複数の磁性グリッドと、空間の広い部分までアークを導くアークランナとを備える回路遮断器において、磁気ヨークおよび永久磁石を設ける技術が開示されている。かかる磁気ヨークおよび永久磁石によって、アークに働く磁場の大きさを大きくすることができる。 Therefore, for example, Patent Document 1 provides a technique for providing a magnetic yoke and a permanent magnet in a circuit breaker including a plurality of magnetic grids stacked at intervals from each other and an arc runner that guides an arc to a wide part of a space. It is disclosed. With such a magnetic yoke and a permanent magnet, the magnitude of the magnetic field acting on the arc can be increased.
特開昭５７－１８０８３８号公報Japanese Unexamined Patent Publication No. 57-180838
　しかしながら、数十アンペアの小電流から数キロアンペアの大電流までの遮断を予め定められた回数遮断できることが求められる回路遮断器に特許文献１に記載の技術を適用した場合、アークを駆動するための十分な駆動力を得ようとすると大型化する可能性がある。 However, when the technique described in Patent Document 1 is applied to a circuit breaker that is required to be able to cut off a small current of several tens of amperes to a large current of several kiloamperes a predetermined number of times, it drives an arc. There is a possibility that the size will increase if sufficient driving force is to be obtained.
　本発明は、上記に鑑みてなされたものであって、大型化を抑制しつつ、高電圧化に対応することができる回路遮断器を得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to obtain a circuit breaker capable of cope with a high voltage while suppressing an increase in size.
　上述した課題を解決し、目的を達成するために、本発明の回路遮断器は、導電部材と、可動接触子と、グリッド部と、コアと、アークランナと、永久磁石とを備える。導電部材は、一端側に固定接点が設けられ、他端側に電源側端子が設けられる。可動接触子は、固定接点と対向する可動接点が設けられる。グリッド部は、固定接点と可動接点との間に発生するアークを消弧する複数のグリッド板を有する。コアは、互いに対向する一対の側板部を有し、一対の側板部間にグリッド部が配置される。アークランナは、導電部材に接続され、アークを駆動する。永久磁石は、可動接触子がグリッド部と対向する方向または一対の側板部が対向する方向に極性が互いに異なる２つの磁極が配列される。 In order to solve the above-mentioned problems and achieve the object, the circuit breaker of the present invention includes a conductive member, a movable contactor, a grid portion, a core, an arc runner, and a permanent magnet. The conductive member is provided with a fixed contact on one end side and a power supply side terminal on the other end side. The movable contact is provided with a movable contact facing the fixed contact. The grid portion has a plurality of grid plates that extinguish the arc generated between the fixed contact and the movable contact. The core has a pair of side plate portions facing each other, and a grid portion is arranged between the pair of side plate portions. The arcranna is connected to the conductive member and drives the arc. In the permanent magnet, two magnetic poles having different polarities are arranged in the direction in which the movable contacts face the grid portion or in the direction in which the pair of side plate portions face each other.
　本発明によれば、大型化を抑制しつつ、高電圧化に対応することができる、という効果を奏する。 According to the present invention, there is an effect that it is possible to cope with a high voltage while suppressing an increase in size.
本発明の実施の形態１にかかる回路遮断器の全体を示す側断面図Side sectional view showing the whole circuit breaker according to Embodiment 1 of this invention. 実施の形態１にかかる消弧ユニットの分解斜視図An exploded perspective view of the arc extinguishing unit according to the first embodiment. 実施の形態１にかかる消弧ユニットの外観斜視図External perspective view of the arc extinguishing unit according to the first embodiment 実施の形態１にかかる可動子ストッパを外した状態の消弧装置を示す分解斜視図An exploded perspective view showing an arc extinguishing device in a state where the mover stopper according to the first embodiment is removed. 実施の形態１にかかる固定接触子の側面図Side view of the fixed contact according to the first embodiment 実施の形態１にかかる固定接触子の平面図Top view of the fixed contact according to the first embodiment 実施の形態１にかかるコアの平面図Top view of the core according to the first embodiment 実施の形態１にかかるコアの側面図Side view of the core according to the first embodiment 実施の形態１にかかる絶縁部材の平面図Top view of the insulating member according to the first embodiment 実施の形態１にかかる絶縁部材の側面図Side view of the insulating member according to the first embodiment 実施の形態１にかかる絶縁部材の外観斜視図External perspective view of the insulating member according to the first embodiment 実施の形態１にかかる絶縁部材とグリッド部とコアと固定接触子との位置関係を示す側断面図Side sectional view showing the positional relationship between the insulating member, the grid portion, the core, and the fixed contact according to the first embodiment. 実施の形態１にかかる消弧ユニットのうち一部の構成を示す側断面図Side sectional view showing a part of the configuration of the arc extinguishing unit according to the first embodiment. 図１３に示す消弧ユニットのうちグリッド部と絶縁部材を不図示にした側断面図A side sectional view of the arc extinguishing unit shown in FIG. 13 in which the grid portion and the insulating member are not shown. 実施の形態１にかかる消弧ユニットのうち一部の構成例を示す平面図Top view showing a configuration example of a part of the arc extinguishing unit according to the first embodiment. 実施の形態１にかかる消弧ユニットの他の構成例を示す平面図Top view showing another configuration example of the arc extinguishing unit according to the first embodiment. 本発明の実施の形態２にかかる回路遮断器の消弧ユニットのうち一部の構成例を示す平面図Top view showing a configuration example of a part of the arc extinguishing unit of the circuit breaker according to the second embodiment of the present invention. 実施の形態２にかかるコアの他の構成例を示す断面図Sectional drawing which shows the other structural example of the core which concerns on Embodiment 2. 本発明の実施の形態３にかかる回路遮断器の消弧ユニットのうち一部の構成例を示す平面図Top view showing a configuration example of a part of the arc-extinguishing unit of the circuit breaker according to the third embodiment of the present invention.
　以下に、本発明の実施の形態にかかる回路遮断器を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 The circuit breaker according to the embodiment of the present invention will be described in detail below with reference to the drawings. The present invention is not limited to this embodiment.
実施の形態１．
　図１は、本発明の実施の形態１にかかる回路遮断器の全体を示す側断面図である。図１には、説明を分かりやすくするために、紙面における上方を正方向とするＺ軸を含む３次元の直交座標系を図示している。かかる直交座標系は、以下の説明で用いる他の図面においても示しており、回路遮断器の構成の一部のみを図示する場合において、Ｘ軸、Ｙ軸、およびＺ軸の各方向は、図１に示す状態、すなわち回路遮断器を組み立てた状態での方向である。 Embodiment 1.
FIG. 1 is a side sectional view showing the entire circuit breaker according to the first embodiment of the present invention. In FIG. 1, for the sake of clarity, a three-dimensional Cartesian coordinate system including the Z axis whose positive direction is upward on the paper is shown. Such a Cartesian coordinate system is also shown in other drawings used in the following description, and when only a part of the circuit breaker configuration is illustrated, the X-axis, Y-axis, and Z-axis directions are shown in the figure. This is the direction shown in 1, that is, the state in which the circuit breaker is assembled.
　図１に示すように、回路遮断器１００は、絶縁性の筐体１と、複数の回路遮断ユニット２と、開閉機構部３と、クロスバー４とを備える。筐体１は、各々絶縁材料で形成されたベース１１とカバー１２を有する。 As shown in FIG. 1, the circuit breaker 100 includes an insulating housing 1, a plurality of circuit breaker units 2, an opening / closing mechanism unit 3, and a crossbar 4. The housing 1 has a base 11 and a cover 12, each of which is made of an insulating material.
　ベース１１上には、複数の回路遮断ユニット２および開閉機構部３が配置される。カバー１２は、ベース１１上に配置された複数の回路遮断ユニット２および開閉機構部３を覆う。カバー１２には不図示のハンドル用窓孔が形成されており、かかるハンドル用窓孔から開閉機構部３の操作ハンドル２７が突出している。 A plurality of circuit cutoff units 2 and an opening / closing mechanism unit 3 are arranged on the base 11. The cover 12 covers a plurality of circuit cutoff units 2 and an opening / closing mechanism 3 arranged on the base 11. A handle window hole (not shown) is formed in the cover 12, and the operation handle 27 of the opening / closing mechanism portion 3 projects from the handle window hole.
　複数の回路遮断ユニット２は、互いに間隔を空けてベース１１上に配列される。これら複数の回路遮断ユニット２は、互いに同一の構成を有している。かかる回路遮断ユニット２は、回路遮断器１００が遮断する電路の数分設けられる。各回路遮断ユニット２は、可動接触子２１と、可動接触子ホルダ２２と、引き外し装置２３と、負荷側導体２４と、消弧ユニット２５とを備える。消弧ユニット２５には、固定接触子６０が含まれる。 The plurality of circuit cutoff units 2 are arranged on the base 11 at intervals from each other. These plurality of circuit cutoff units 2 have the same configuration as each other. Such a circuit breaker unit 2 is provided for the number of electric circuits cut by the circuit breaker 100. Each circuit cutoff unit 2 includes a movable contact 21, a movable contact holder 22, a tripping device 23, a load-side conductor 24, and an arc extinguishing unit 25. The arc extinguishing unit 25 includes a fixed contact 60.
　可動接触子２１は、基端がクロスバー４により回転自在に支持され、先端に可動接点２６が設けられる。固定接触子６０には、一端に可動接点２６が接触および開離する固定接点７１と、他端に電源側導体に接続される電源側端子７２とが設けられる。引き外し装置２３は、可動接触子２１と負荷側導体２４との間に設けられ、過電流が流れた場合に、開閉機構部３における不図示のトリップバーを駆動する。かかる引き外し装置２３は、可動接触子２１に可動接触子ホルダ２２を介して接続される。 The base end of the movable contact 21 is rotatably supported by the crossbar 4, and the movable contact 26 is provided at the tip. The fixed contact 60 is provided with a fixed contact 71 at which the movable contact 26 contacts and opens at one end, and a power supply side terminal 72 connected to the power supply side conductor at the other end. The tripping device 23 is provided between the movable contact 21 and the load-side conductor 24, and drives a trip bar (not shown) in the opening / closing mechanism portion 3 when an overcurrent flows. The tripping device 23 is connected to the movable contact 21 via the movable contact holder 22.
　開閉機構部３は、ベース１１上に配置され、例えば、周知のトグルリンク機構と、周知のトリップバーとを備える。開閉機構部３は、引き外し装置２３によってトリップバーが駆動された場合、回路遮断器１００をトリップ状態にする。 The opening / closing mechanism portion 3 is arranged on the base 11, and includes, for example, a well-known toggle link mechanism and a well-known trip bar. The opening / closing mechanism 3 puts the circuit breaker 100 in a trip state when the trip bar is driven by the trip device 23.
　クロスバー４は、複数の回路遮断ユニット２の配列方向に沿って延伸しており、各回路遮断ユニット２に設けられた可動接触子２１の基端に取り付けられる。クロスバー４は、開閉機構部３によって、クロスバー４の軸心を中心として回転される。開閉機構部３によるクロスバー４の回転に連動して、各回路遮断ユニット２の可動接触子２１が回転し、かかる可動接触子２１の回転により、可動接点２６が固定接点７１に接触したり、可動接点２６が固定接点７１から開離したりする。 The crossbar 4 extends along the arrangement direction of the plurality of circuit breaking units 2, and is attached to the base end of the movable contact 21 provided in each circuit breaking unit 2. The crossbar 4 is rotated about the axis of the crossbar 4 by the opening / closing mechanism portion 3. The movable contact 21 of each circuit cutoff unit 2 rotates in conjunction with the rotation of the crossbar 4 by the opening / closing mechanism 3, and the rotation of the movable contact 21 causes the movable contact 26 to come into contact with the fixed contact 71. The movable contact 26 may be separated from the fixed contact 71.
　固定接点７１と可動接点２６とにより電路を開閉する開閉接点が構成される。可動接点２６が固定接点７１に接触することによって、電路が接続され、電源側端子７２および負荷側導体２４を介して電気回路がオンになる。また、可動接点２６が固定接点７１から開離することによって、電路が遮断され、電源側端子７２および負荷側導体２４を電路に含む電気回路がオフになる。 The fixed contact 71 and the movable contact 26 form an opening / closing contact that opens / closes the electric path. When the movable contact 26 comes into contact with the fixed contact 71, the electric circuit is connected, and the electric circuit is turned on via the power supply side terminal 72 and the load side conductor 24. Further, when the movable contact 26 is separated from the fixed contact 71, the electric circuit is cut off, and the electric circuit including the power supply side terminal 72 and the load side conductor 24 in the electric circuit is turned off.
　消弧ユニット２５は、固定接触子６０を含み、電路の遮断時に発生するアークを消弧する。以下、消弧ユニット２５について具体的に説明する。図２は、実施の形態１にかかる消弧ユニットの分解斜視図である。図３は、実施の形態１にかかる消弧ユニットの外観斜視図である。 The arc extinguishing unit 25 includes the fixed contactor 60 and extinguishes the arc generated when the electric path is cut off. Hereinafter, the arc extinguishing unit 25 will be specifically described. FIG. 2 is an exploded perspective view of the arc extinguishing unit according to the first embodiment. FIG. 3 is an external perspective view of the arc extinguishing unit according to the first embodiment.
　図２および図３に示すように、消弧ユニット２５は、遮断時に固定接点７１と可動接点２６との間に発生したアークを消弧する消弧装置３０と、消弧装置３０の周囲に配置され、磁性体によって構成されるコア４０とを備える。さらに、消弧ユニット２５は、消弧装置３０を囲むように設けられ、消弧装置３０とコア４０との間を絶縁する絶縁部材５０と、固定接点７１および電源側端子７２が設けられる固定接触子６０とを備える。 As shown in FIGS. 2 and 3, the arc extinguishing unit 25 is arranged around the arc extinguishing device 30 and the arc extinguishing device 30 for extinguishing the arc generated between the fixed contact 71 and the movable contact 26 at the time of interruption. It is provided with a core 40 made of a magnetic material. Further, the arc extinguishing unit 25 is provided so as to surround the arc extinguishing device 30, and is provided with an insulating member 50 that insulates between the arc extinguishing device 30 and the core 40, and a fixed contact 71 and a power supply side terminal 72. It has a child 60.
　図４は、実施の形態１にかかる可動子ストッパを外した状態の消弧装置を示す分解斜視図である。図４に示すように、消弧装置３０は、磁性鋼板によって各々構成される複数のグリッド板３４を有するグリッド部３１と、絶縁性の材料によって各々形成され複数のグリッド板３４を互いに間隔を空けて支持する一対の支持板３２とを有する。 FIG. 4 is an exploded perspective view showing an arc extinguishing device in a state where the mover stopper according to the first embodiment is removed. As shown in FIG. 4, the arc extinguishing device 30 has a grid portion 31 having a plurality of grid plates 34 each composed of a magnetic steel plate and a plurality of grid plates 34 each formed of an insulating material so as to be spaced from each other. It has a pair of support plates 32 that support it.
　各グリッド板３４は、四角状の磁性鋼板の一辺にＵ字状の切り欠き３５が設けられ、切り欠き３５の両側に側足部３４ａが形成されている。Ｕ字状の切り欠き３５は、グリッド板３４のうち可動接触子２１と対向する領域に形成されており、かかるＵ字状の切り欠き３５によって形成される空間を可動接点２６が設けられた可動接触子２１の先端部がクロスバー４を中心軸として回転する。 Each grid plate 34 is provided with a U-shaped notch 35 on one side of a square magnetic steel plate, and side foot portions 34a are formed on both sides of the notch 35. The U-shaped notch 35 is formed in a region of the grid plate 34 facing the movable contact 21, and a movable contact 26 is provided in the space formed by the U-shaped notch 35. The tip of the contact 21 rotates about the crossbar 4 as a central axis.
　各グリッド板３４における両端部は、支持板３２に形成された不図示の貫通孔に挿通され、先端のカシメ部３４ｂが拡がるように塑性変形される。これにより、各グリッド板３４が支持板３２に保持される。また、消弧装置３０は、一対の支持板３２に基端が回転可能に支持される可動子ストッパ３３を有している。なお、図４に示す例では、消弧装置３０から可動子ストッパ３３が取り外された状態を示している。 Both ends of each grid plate 34 are inserted into through holes (not shown) formed in the support plate 32, and are plastically deformed so that the crimped portion 34b at the tip expands. As a result, each grid plate 34 is held by the support plate 32. Further, the arc extinguishing device 30 has a mover stopper 33 whose base end is rotatably supported by a pair of support plates 32. In the example shown in FIG. 4, the state in which the mover stopper 33 is removed from the arc extinguishing device 30 is shown.
　図５は、実施の形態１にかかる固定接触子の側面図である。図６は、実施の形態１にかかる固定接触子の平面図である。図５および図６に示すように、固定接触子６０は、固定接点７１が上面に配置される導電部材７０と、導電部材７０の上面に配置され、導電部材７０に電気的に接続されるアークランナ８０と、アークランナ８０の下方に配置される永久磁石８１とを備える。 FIG. 5 is a side view of the fixed contact according to the first embodiment. FIG. 6 is a plan view of the fixed contact according to the first embodiment. As shown in FIGS. 5 and 6, the fixed contact 60 is an arc runner in which the fixed contact 71 is arranged on the upper surface of the conductive member 70 and the fixed contact 71 is arranged on the upper surface of the conductive member 70 and is electrically connected to the conductive member 70. 80 and a permanent magnet 81 arranged below the arc runner 80.
　導電部材７０は、電源側端子７２に一端が接続されベース１１へ向かう方向である下方に延伸する第１電路７３と、第１電路７３の他端に一端が接続され、可動接触子２１へ向かう方向に延伸する一対の第２電路７４とを有する。また、導電部材７０は、一対の第２電路７４の他端に一端が接続される第３電路７５と、第３電路７５の一端に連続し、電源側端子７２へ向かう方向に延伸する第４電路７６を備える。 One end of the conductive member 70 is connected to the power supply side terminal 72 and one end is connected to the first electric path 73 extending downward in the direction toward the base 11, and one end is connected to the other end of the first electric path 73 toward the movable contact 21. It has a pair of second conductors 74 extending in the direction. Further, the conductive member 70 is continuous with the third electric circuit 75 whose one end is connected to the other ends of the pair of second electric circuits 74 and one end of the third electric circuit 75, and extends in the direction toward the power supply side terminal 72. The electric circuit 76 is provided.
　第４電路７６の基端部の上面には、固定接点７１が設けられる。また、第４電路７６は、一対の第２電路７４間に一対の第２電路７４と間隔を空けて配置され、一対の第２電路７４に沿って延伸する。 A fixed contact 71 is provided on the upper surface of the base end portion of the fourth electric path 76. Further, the fourth electric line 76 is arranged between the pair of second electric lines 74 at a distance from the pair of second electric lines 74, and extends along the pair of second electric lines 74.
　アークランナ８０は、第４電路７６基端部の上面に配置された基端からベース１１の底面へ向かう方向に延伸した後、中途部が屈曲してベース１１の底面に沿った方向であって電源側端子７２へ向かう方向に延伸する。永久磁石８１は、一対の第２電路７４間の空間部７７のうちアークランナ８０の先端の下方に配置される。 The arcranna 80 extends in a direction from the base end arranged on the upper surface of the base end portion of the fourth electric path 76 toward the bottom surface of the base 11, and then bends in the middle portion in a direction along the bottom surface of the base 11 to supply power. It extends in the direction toward the side terminal 72. The permanent magnet 81 is arranged below the tip of the arc runner 80 in the space 77 between the pair of second electric paths 74.
　第２電路７４は、第１電路７３の他端に一端が接続されベース１１上をベース１１の底面に沿って延伸する平行電路７４ａと、平行電路７４ａの他端に一端が接続され、固定接点７１に向けてベース１１の底面に対して斜めに延伸する傾斜電路７４ｂとを有する。また、第２電路７４は、傾斜電路７４ｂの他端に連続し、第３電路７５まで延伸する接続電路７４ｃを有する。 The second electric path 74 has a parallel electric path 74a having one end connected to the other end of the first electric path 73 and extending on the base 11 along the bottom surface of the base 11, and one end connected to the other end of the parallel electric path 74a. It has an inclined electric circuit 74b extending obliquely with respect to the bottom surface of the base 11 toward 71. Further, the second electric line 74 has a connecting electric line 74c that is continuous with the other end of the inclined electric line 74b and extends to the third electric line 75.
　このように、固定接触子６０は、固定接点７１および負荷側導体２４が設けられる導電部材７０の上面に配置されるアークランナ８０を有し、アークランナ８０の下方に永久磁石８１が配置される。 As described above, the fixed contact 60 has an arc runner 80 arranged on the upper surface of the conductive member 70 provided with the fixed contact 71 and the load side conductor 24, and the permanent magnet 81 is arranged below the arc runner 80.
　次に、コア４０の構成について説明する。図７は、実施の形態１にかかるコアの平面図である。図８は、実施の形態１にかかるコアの側面図である。図７に示すように、コア４０は、一対の側板部４１と、かかる一対の側板部４１の一端を連結するシールド部４２とを有し、磁性体から構成される。 Next, the configuration of the core 40 will be described. FIG. 7 is a plan view of the core according to the first embodiment. FIG. 8 is a side view of the core according to the first embodiment. As shown in FIG. 7, the core 40 has a pair of side plate portions 41 and a shield portion 42 connecting one ends of the pair of side plate portions 41, and is composed of a magnetic material.
　シールド部４２は、第１電路７３の固定接点７１側を覆うように第１電路７３とアークランナ８０の間に設けられる。シールド部４２は、第１電路７３を流れる電流によって、アークランナ８０の周辺に発生する磁界を遮蔽する。 The shield portion 42 is provided between the first electric path 73 and the arc runner 80 so as to cover the fixed contact 71 side of the first electric path 73. The shield portion 42 shields the magnetic field generated around the arc runner 80 by the current flowing through the first electric circuit 73.
　また、一対の側板部４１は、平行電路７４ａの上部に配置され、平行電路７４ａに流れる電流によって発生する磁束を一対の側板部４１に集中させ、アークランナ８０付近の磁界を低減する作用を有する。 Further, the pair of side plate portions 41 are arranged above the parallel electric circuit 74a, and have an effect of concentrating the magnetic flux generated by the current flowing in the parallel electric circuit 74a on the pair of side plate portions 41 and reducing the magnetic field near the arc runner 80.
　次に、絶縁部材５０の構成について説明する。図９は、実施の形態１にかかる絶縁部材の平面図である。図１０は、実施の形態１にかかる絶縁部材の側面図である。図１１は、実施の形態１にかかる絶縁部材の外観斜視図である。図１２は、実施の形態１にかかる絶縁部材とグリッド部とコアと固定接触子との位置関係を示す側断面図である。 Next, the configuration of the insulating member 50 will be described. FIG. 9 is a plan view of the insulating member according to the first embodiment. FIG. 10 is a side view of the insulating member according to the first embodiment. FIG. 11 is an external perspective view of the insulating member according to the first embodiment. FIG. 12 is a side sectional view showing a positional relationship between the insulating member, the grid portion, the core, and the fixed contact according to the first embodiment.
　図９および図１１に示すように、絶縁部材５０は、互いに対向する一対の側部５１と、一対の側部５１のうち対応する側部５１におけるベース１１の底面側の端部に連続し、ベース１１の底面に沿って各々延伸する一対のカバー部５２とを有する。 As shown in FIGS. 9 and 11, the insulating member 50 is continuous with the pair of side portions 51 facing each other and the bottom end of the base 11 in the corresponding side portions 51 of the pair of side portions 51. It has a pair of cover portions 52 that extend along the bottom surface of the base 11.
　一対の側部５１は、一対の側板部４１の各々と消弧装置３０との間に配置され、一対の側板部４１の各々と消弧装置３０との間を絶縁する。一対のカバー部５２は、導電部材７０の第２電路７４と消弧装置３０のグリッド部３１との間に配置され、第２電路７４がグリッド部３１側に露出しないように消弧装置３０を覆う。 The pair of side portions 51 are arranged between each of the pair of side plate portions 41 and the arc extinguishing device 30, and insulate between each of the pair of side plate portions 41 and the arc extinguishing device 30. The pair of cover portions 52 are arranged between the second electric circuit 74 of the conductive member 70 and the grid portion 31 of the arc extinguishing device 30, and the arc extinguishing device 30 is provided so that the second electric circuit 74 is not exposed to the grid portion 31 side. cover.
　また、図１０に示すように、絶縁部材５０は、一対の側部５１の電源側端子７２側の端部同士を連結するシールド部カバー５３を有する。シールド部カバー５３は、図１２に示すように、コア４０のシールド部４２とグリッド部３１との間に配置され、コア４０のシールド部４２がグリッド部３１側に露出しないように、グリッド部３１を覆う。なお、図１２に示すように、アークランナ８０は、導電部材７０に導電性のネジ７８などによって取り付けられることによって、導電部材７０に電気的に接続される。 Further, as shown in FIG. 10, the insulating member 50 has a shield portion cover 53 that connects the ends of the pair of side portions 51 on the power supply side terminal 72 side. As shown in FIG. 12, the shield portion cover 53 is arranged between the shield portion 42 of the core 40 and the grid portion 31 so that the shield portion 42 of the core 40 is not exposed to the grid portion 31 side. Cover. As shown in FIG. 12, the arc runner 80 is electrically connected to the conductive member 70 by being attached to the conductive member 70 by a conductive screw 78 or the like.
　次に、消弧ユニット２５において固定接点７１と可動接点２６との間に発生したアークが消弧される動作について説明する。図１３は、実施の形態１にかかる消弧ユニットのうち一部の構成を示す側断面図である。図１４は、図１３に示す消弧ユニットのうちグリッド部と絶縁部材を不図示にした側断面図である。図１５は、実施の形態１にかかる消弧ユニットのうち一部の構成例を示す平面図である。なお、図１３および図１４においては、グリッド部３１のうち支持板３２および可動子ストッパ３３は図示していない。 Next, in the arc extinguishing unit 25, the operation of extinguishing the arc generated between the fixed contact 71 and the movable contact 26 will be described. FIG. 13 is a side sectional view showing a part of the configuration of the arc extinguishing unit according to the first embodiment. FIG. 14 is a side sectional view of the arc extinguishing unit shown in FIG. 13 in which the grid portion and the insulating member are not shown. FIG. 15 is a plan view showing a configuration example of a part of the arc extinguishing unit according to the first embodiment. In addition, in FIGS. 13 and 14, the support plate 32 and the mover stopper 33 of the grid portion 31 are not shown.
　図１３および図１４に示す状態から、開閉機構部３のオフ動作またはトリップ動作によって、可動接点２６が固定接点７１から開離し始まると、固定接点７１と可動接点２６との間に、導電性のあるガスであるアークが発生する。 From the state shown in FIGS. 13 and 14, when the movable contact 26 starts to be separated from the fixed contact 71 by the off operation or the trip operation of the opening / closing mechanism portion 3, the conductive contact is held between the fixed contact 71 and the movable contact 26. An arc, which is a certain gas, is generated.
　永久磁石８１は、Ｎ極８１ａとＳ極８１ｂを有しており、Ｎ極８１ａが固定接点７１側に配置され、Ｓ極８１ｂが電源側端子７２側に配置される。磁場の向き９２は、図１５に示すようになる。すなわち、磁場は、Ｎ極８１ａからアークランナ８０および第４電路７６を通り、アークランナ８０および第４電路７６から空隙を介してコア４０における一対の側板部４１に向かい、さらにコア４０のシールド部４２を通じてＳ極８１ｂへ戻る。 The permanent magnet 81 has an N pole 81a and an S pole 81b, the N pole 81a is arranged on the fixed contact 71 side, and the S pole 81b is arranged on the power supply side terminal 72 side. The direction 92 of the magnetic field is as shown in FIG. That is, the magnetic field flows from the north pole 81a through the arc runner 80 and the fourth electric circuit 76, from the arc runner 80 and the fourth electric circuit 76 through the gap to the pair of side plate portions 41 in the core 40, and further through the shield portion 42 of the core 40. Return to the S pole 81b.
　また、可動接点２６と固定接点７１とはＺ軸方向で互いに対向しているため、電流が流れる向き９１は、図１５に示すように、Ｚ軸負方向である。 Further, since the movable contact 26 and the fixed contact 71 face each other in the Z-axis direction, the direction 91 in which the current flows is the Z-axis negative direction as shown in FIG.
　このように、電流が流れる向き９１および磁場の向き９２が決まっていることから、フレミング左手の法則により、アークが駆動される方向である駆動方向９３は、図１５に示す方向になる。 Since the direction 91 in which the current flows and the direction 92 in the magnetic field are determined in this way, the driving direction 93, which is the direction in which the arc is driven, is the direction shown in FIG. 15 according to Fleming's left-hand rule.
　実施の形態１にかかる消弧ユニット２５では、永久磁石８１を配置することによって、アークに働く磁場の大きさを大きくすることができ、また、コア４０の一対の側板部４１間にグリッド部３１が配置される。これにより、コア４０の内部に磁束を集中することができる。そのため、効率よくアークをグリッド部３１に駆動させることができ、アークをグリッド部３１内に維持させて消弧させることができる。 In the arc extinguishing unit 25 according to the first embodiment, the magnitude of the magnetic field acting on the arc can be increased by arranging the permanent magnet 81, and the grid portion 31 is located between the pair of side plate portions 41 of the core 40. Is placed. As a result, the magnetic flux can be concentrated inside the core 40. Therefore, the arc can be efficiently driven by the grid portion 31, and the arc can be maintained in the grid portion 31 and extinguished.
　さらに、消弧ユニット２５では、アークランナ８０の下方に永久磁石８１が配置されるため、永久磁石８１にアークが直接当たらない。そのため、永久磁石８１においてアークによる熱減磁を抑制することができ、グリッド部３１によるアークの駆動力が熱減磁によって低減することを抑制することができる。 Further, in the arc extinguishing unit 25, since the permanent magnet 81 is arranged below the arc runner 80, the arc does not directly hit the permanent magnet 81. Therefore, it is possible to suppress the thermal demagnetization due to the arc in the permanent magnet 81, and it is possible to suppress the reduction of the driving force of the arc by the grid portion 31 due to the thermal demagnetization.
　また、上述した例では、永久磁石８１は、アークランナ８０の先端の下方に位置する構成であるが、永久磁石８１の位置はアークランナ８０の中途部の下方に位置する構成であってもよい。図１６は、実施の形態１にかかる消弧ユニットの他の構成例を示す平面図である。 Further, in the above-described example, the permanent magnet 81 is configured to be located below the tip of the arc runner 80, but the position of the permanent magnet 81 may be located below the middle portion of the arc runner 80. FIG. 16 is a plan view showing another configuration example of the arc extinguishing unit according to the first embodiment.
　図１６に示すように、永久磁石８１の位置はアークランナ８０の延伸方向における中途部の下方に位置する場合であっても、コア４０の一対の側板部４１間にグリッド部３１が配置されることから、コア４０の内部に磁束を集中することができる。そのため、効率よくアークをグリッド部３１に駆動させることができ、アークをグリッド部３１内に維持させて消弧させることができる。 As shown in FIG. 16, even when the position of the permanent magnet 81 is located below the midway portion in the stretching direction of the arc runner 80, the grid portion 31 is arranged between the pair of side plate portions 41 of the core 40. Therefore, the magnetic flux can be concentrated inside the core 40. Therefore, the arc can be efficiently driven by the grid portion 31, and the arc can be maintained in the grid portion 31 and extinguished.
　また、アークランナ８０の中途部の下方に永久磁石８１を配置することにより、永久磁石８１をアークランナ８０の先端の下方に配置する場合に比べ、アークに作用する磁場を大きくすることができる。これにより、遮断時の可動接点２６および固定接点７１の消耗量を低減することができる。また、永久磁石８１にアークが直接当たらないことから、永久磁石８１においてアークによる熱減磁を抑制することができる。そのため、グリッド部３１によるアークの駆動力が低減することを抑制することができる。 Further, by arranging the permanent magnet 81 below the middle part of the arc runner 80, the magnetic field acting on the arc can be increased as compared with the case where the permanent magnet 81 is arranged below the tip of the arc runner 80. As a result, the amount of wear of the movable contact 26 and the fixed contact 71 at the time of interruption can be reduced. Further, since the arc does not directly hit the permanent magnet 81, thermal demagnetization due to the arc can be suppressed in the permanent magnet 81. Therefore, it is possible to prevent the grid portion 31 from reducing the driving force of the arc.
　以上のように、実施の形態１にかかる回路遮断器１００は、導電部材７０と、可動接触子２１と、グリッド部３１と、コア４０と、アークランナ８０と、永久磁石８１とを備える。導電部材７０は、一端側に固定接点７１が設けられ、他端側に電源側端子７２が設けられる。可動接触子２１は、固定接点７１と対向する可動接点２６が設けられる。グリッド部３１は、固定接点７１と可動接点２６との間に発生するアークを消弧する複数のグリッド板３４を有する。コア４０は、互いに対向する一対の側板部４１を有し、一対の側板部４１間にグリッド部３１が配置される。アークランナ８０は、導電部材７０に接続され、アークを駆動する。永久磁石８１は、可動接触子２１がグリッド部３１と対向する方向に極性が互いに異なる２つの磁極であるＮ極８１ａとＳ極８１ｂとが配列される。これにより、コア４０の内部に磁束を集中することができることから、効率よくアークをグリッド部３１に向けて駆動させることができ、アークをグリッド部３１内に維持させて消弧させることができる。そのため、回路遮断器１００の大型化を抑制しつつ、高電圧化に対応することができる。 As described above, the circuit breaker 100 according to the first embodiment includes a conductive member 70, a movable contactor 21, a grid portion 31, a core 40, an arc runner 80, and a permanent magnet 81. The conductive member 70 is provided with a fixed contact 71 on one end side and a power supply side terminal 72 on the other end side. The movable contact 21 is provided with a movable contact 26 facing the fixed contact 71. The grid portion 31 has a plurality of grid plates 34 that extinguish the arc generated between the fixed contact 71 and the movable contact 26. The core 40 has a pair of side plate portions 41 facing each other, and a grid portion 31 is arranged between the pair of side plate portions 41. The arcranna 80 is connected to the conductive member 70 and drives the arc. In the permanent magnet 81, two poles 81a and S poles 81b, which are two magnetic poles having different polarities in the direction in which the movable contact 21 faces the grid portion 31, are arranged. As a result, since the magnetic flux can be concentrated inside the core 40, the arc can be efficiently driven toward the grid portion 31, and the arc can be maintained in the grid portion 31 and extinguished. Therefore, it is possible to cope with the increase in voltage while suppressing the increase in size of the circuit breaker 100.
　また、永久磁石８１は、可動接点２６から固定接点７１へ向かう方向を下方とした場合に、アークランナ８０の下方に配置される。これにより、永久磁石８１においてアークによる熱減磁を抑制することができるため、消弧装置３０によるアークの駆動力が低減することを抑制することができる。 Further, the permanent magnet 81 is arranged below the arc runner 80 when the direction from the movable contact 26 to the fixed contact 71 is downward. As a result, the permanent magnet 81 can suppress thermal demagnetization due to the arc, so that it is possible to suppress a decrease in the driving force of the arc by the arc extinguishing device 30.
実施の形態２．
　実施の形態２にかかる消弧ユニットは、コアがグリッド部と電源側端子との間に配置される一部に開口部を有するように、コアが２つの分割コアで形成される点で、コアが分割されていない実施の形態１にかかる消弧ユニット２５と異なる。以下においては、実施の形態１にかかる消弧ユニット２５と同様の構成については同一符号を付して説明を省略し、実施の形態１にかかる消弧ユニット２５と異なる構成について主に説明するものとする。 Embodiment 2.
The arc-extinguishing unit according to the second embodiment is a core in that the core is formed by two divided cores so that the core has an opening in a part arranged between the grid portion and the power supply side terminal. Is different from the arc extinguishing unit 25 according to the first embodiment in which is not divided. In the following, the same components as those of the arc extinguishing unit 25 according to the first embodiment will be designated by the same reference numerals and the description thereof will be omitted, and the configurations different from those of the arc extinguishing unit 25 according to the first embodiment will be mainly described. And.
　図１７は、本発明の実施の形態２にかかる回路遮断器の消弧ユニットのうち一部の構成例を示す平面図である。図１７に示すように、実施の形態２にかかる回路遮断器１００Ａの消弧ユニット２５Ａは、コア４０に代えて、コア４０Ａを有する点で、実施の形態１にかかる回路遮断器１００の消弧ユニット２５と異なる。なお、回路遮断器１００Ａは、消弧ユニット２５Ａ以外の構成は、回路遮断器１００の構成と同じであり、図示を省略する。 FIG. 17 is a plan view showing a configuration example of a part of the arc extinguishing unit of the circuit breaker according to the second embodiment of the present invention. As shown in FIG. 17, the arc-extinguishing unit 25A of the circuit breaker 100A according to the second embodiment has the core 40A instead of the core 40, and the circuit breaker 100 according to the first embodiment extinguishes the arc. Different from unit 25. The circuit breaker 100A has the same configuration as the circuit breaker 100 except for the arc extinguishing unit 25A, and is not shown.
　コア４０Ａは、第１分割コア４３ａと第２分割コア４３ｂとを有する。第１分割コア４３ａは、側板部４１ａと、側板部４１ａの端部から第２分割コア４３ｂへ近づく方向であるＸ軸正方向に突出する第１突出部４２ａとを有する。同様に、第２分割コア４３ｂは、側板部４１ｂと、側板部４１ｂの端部から第１分割コア４３ａへ近づく方向であるＸ軸負方向に突出する第２突出部４２ｂとを有する。 The core 40A has a first split core 43a and a second split core 43b. The first divided core 43a has a side plate portion 41a and a first protruding portion 42a projecting in the positive direction of the X axis, which is a direction approaching the second divided core 43b from the end portion of the side plate portion 41a. Similarly, the second divided core 43b has a side plate portion 41b and a second protruding portion 42b projecting in the negative X-axis direction from the end portion of the side plate portion 41b toward the first divided core 43a.
　一対の側板部４１ａ，４１ｂは、実施の形態１にかかる一対の側板部４１と同じ構成である。すなわち、一対の側板部４１ａ，４１ｂは互いに対向し、一対の側板部４１ａ，４１ｂ間には、グリッド部３１が配置される。 The pair of side plate portions 41a and 41b have the same configuration as the pair of side plate portions 41 according to the first embodiment. That is, the pair of side plate portions 41a and 41b face each other, and the grid portion 31 is arranged between the pair of side plate portions 41a and 41b.
　第１突出部４２ａと第２突出部４２ｂとは、一対の側板部４１ａ，４１ｂの対向方向で互いに対向し、グリッド部３１と電源側端子７２との間に配置される。第１突出部４２ａおよび第２突出部４２ｂは、シールド部４２と同様に、第１電路７３を流れる電流によって、アークランナ８０の周辺に発生する磁界を遮蔽する機能を有する。また、第１突出部４２ａと第２突出部４２ｂとの間に開口部４４が形成されており、これにより、回路遮断器１００Ａの内部での過度な圧力上昇を防止することができる。 The first protruding portion 42a and the second protruding portion 42b face each other in the opposite directions of the pair of side plate portions 41a and 41b, and are arranged between the grid portion 31 and the power supply side terminal 72. Similar to the shield portion 42, the first protrusion 42a and the second protrusion 42b have a function of shielding the magnetic field generated around the arc runner 80 by the current flowing through the first electric circuit 73. Further, an opening 44 is formed between the first protruding portion 42a and the second protruding portion 42b, whereby an excessive increase in pressure inside the circuit breaker 100A can be prevented.
　回路遮断器１００Ａの通電中なんらかの原因で通電回路が短絡状態になった場合、図１に示す引き外し装置２３が開閉機構部３に作用し可動接触子２１をトリップ状態に位置にさせる。このとき、数キロアンペアの電流が回路に流れることがある。数キロアンペアの電流が流れている状態で電路を遮断する場合、アークによる磁場の大きさが十分大きいため、永久磁石８１の磁場を使用しなくても、アークは消弧装置３０まで駆動される。 If the energizing circuit is short-circuited for some reason while the circuit breaker 100A is energized, the tripping device 23 shown in FIG. 1 acts on the opening / closing mechanism portion 3 to put the movable contact 21 in the trip state. At this time, a current of several kiloamperes may flow in the circuit. When the electric circuit is cut off while a current of several kiloamperes is flowing, the magnitude of the magnetic field generated by the arc is sufficiently large, so that the arc is driven to the arc extinguishing device 30 without using the magnetic field of the permanent magnet 81. ..
　コア４０Ａで囲まれた領域にアークが閉じ込められて回路遮断器１００Ａの内部に過度な圧力上昇が発生すると、コア４０Ａの強度によってはコア４０Ａが変形する可能性があり、また、筐体１の強度によっては筐体１が破損したりする可能性がある。消弧ユニット２５Ａでは、第１突出部４２ａと第２突出部４２ｂとの間に開口部４４が形成されているため、回路遮断器１００Ａの内部における過度な圧力上昇の発生を精度よく防止することができる。 If the arc is confined in the region surrounded by the core 40A and an excessive pressure rise occurs inside the circuit breaker 100A, the core 40A may be deformed depending on the strength of the core 40A, and the housing 1 may be deformed. Depending on the strength, the housing 1 may be damaged. In the arc extinguishing unit 25A, since the opening 44 is formed between the first protrusion 42a and the second protrusion 42b, it is possible to accurately prevent the occurrence of an excessive pressure rise inside the circuit breaker 100A. Can be done.
　なお、上述したコア４０Ａは、第１分割コア４３ａおよび第２分割コア４３ｂによって構成されるが、圧力上昇防止用に開口部４４が形成される構成であればよく、図１７に示す例に限定されない。図１８は、実施の形態２にかかるコアの他の構成例を示す断面図である。図１８に示すコア４０Ａは、一対の側板部４１ａ，４１ｂと、側板部４１ａの端部と側板部４１ｂの端部とを連結するシールド部４２Ａとを備える。シールド部４２Ａには、貫通孔である開口部４４が形成される。なお、シールド部４２Ａは、シールド部４２と同様の機能を有する。 The core 40A described above is composed of the first divided core 43a and the second divided core 43b, but it may be configured as long as the opening 44 is formed to prevent the pressure from rising, and is limited to the example shown in FIG. Not done. FIG. 18 is a cross-sectional view showing another configuration example of the core according to the second embodiment. The core 40A shown in FIG. 18 includes a pair of side plate portions 41a and 41b, and a shield portion 42A that connects the end portion of the side plate portion 41a and the end portion of the side plate portion 41b. An opening 44, which is a through hole, is formed in the shield portion 42A. The shield portion 42A has the same function as the shield portion 42.
　なお、シールド部４２Ａに形成される開口部４４は、丸孔によって形成されるが、開口部４４の形状は丸孔に限定されない。また、開口部４４の数は２以上であってもよい。また、複数の開口部４４がシールド部４２Ａに形成される場合、各開口部４４の形状は、互いに異なる形状であってもよい。 The opening 44 formed in the shield portion 42A is formed by a round hole, but the shape of the opening 44 is not limited to the round hole. Further, the number of openings 44 may be 2 or more. Further, when a plurality of openings 44 are formed in the shield portion 42A, the shapes of the openings 44 may be different from each other.
　以上のように、実施の形態２にかかる消弧ユニット２５Ａのコア４０Ａは、グリッド部３１と電源側端子７２との間に配置され、一部に開口部４４を有する領域を有する。これにより、回路遮断器１００Ａの内部における過度な圧力上昇の発生を精度よく防止することができる。 As described above, the core 40A of the arc extinguishing unit 25A according to the second embodiment is arranged between the grid portion 31 and the power supply side terminal 72, and has a region having an opening 44 in a part thereof. As a result, it is possible to accurately prevent the occurrence of an excessive pressure rise inside the circuit breaker 100A.
　また、コア４０Ａは、第１分割コア４３ａと、第２分割コア４３ｂとを備える。第１分割コア４３ａは、側板部４１ａと、側板部４１ａの端部から側板部４１ｂへ近づく方向へ突出する第１突出部４２ａとを有する。第２分割コア４３ｂは、側板部４１ｂと、側板部４１ｂの端部から側板部４１ａへ近づく方向へ突出する第２突出部４２ｂとを有する。第１突出部４２ａと第２突出部４２ｂとは、一対の側板部４１ａ，４１ｂの対向方向で互いに対向する。第１突出部４２ａと第２突出部４２ｂとの間に開口部４４が形成される。これにより、回路遮断器１００Ａの内部における過度な圧力上昇の発生を防止する開口部４４を形成することができる。 Further, the core 40A includes a first split core 43a and a second split core 43b. The first divided core 43a has a side plate portion 41a and a first protruding portion 42a that protrudes from the end portion of the side plate portion 41a in a direction approaching the side plate portion 41b. The second divided core 43b has a side plate portion 41b and a second protruding portion 42b that protrudes from the end portion of the side plate portion 41b in a direction approaching the side plate portion 41a. The first protruding portion 42a and the second protruding portion 42b face each other in the opposite directions of the pair of side plate portions 41a and 41b. An opening 44 is formed between the first protrusion 42a and the second protrusion 42b. As a result, the opening 44 that prevents the occurrence of an excessive pressure rise inside the circuit breaker 100A can be formed.
実施の形態３．
　実施の形態３にかかる消弧ユニットは、永久磁石の位置および磁極の向きが、実施の形態２にかかる消弧ユニット２５Ａと異なる。以下においては、実施の形態２にかかる消弧ユニット２５Ａと同様の構成については同一符号を付して説明を省略し、実施の形態２にかかる消弧ユニット２５Ａと異なる構成について主に説明するものとする。 Embodiment 3.
The arc-extinguishing unit according to the third embodiment is different from the arc-extinguishing unit 25A according to the second embodiment in the position of the permanent magnet and the direction of the magnetic poles. In the following, the same components as those of the arc-extinguishing unit 25A according to the second embodiment will be designated by the same reference numerals and the description thereof will be omitted, and the configurations different from the arc-extinguishing unit 25A according to the second embodiment will be mainly described. And.
　図１９は、本発明の実施の形態３にかかる回路遮断器の消弧ユニットのうち一部の構成例を示す平面図である。図１９に示すように、実施の形態３にかかる回路遮断器１００Ｂの消弧ユニット２５Ｂは、第１分割コア４３ａと第２分割コア４３ｂとの間に形成される開口部４４に永久磁石８１が配置される。 FIG. 19 is a plan view showing a configuration example of a part of the arc extinguishing unit of the circuit breaker according to the third embodiment of the present invention. As shown in FIG. 19, in the arc extinguishing unit 25B of the circuit breaker 100B according to the third embodiment, the permanent magnet 81 is provided in the opening 44 formed between the first division core 43a and the second division core 43b. Be placed.
　また、消弧ユニット２５Ｂは、側板部４１ａと側板部４１ｂとが互いに対向する方向にＮ極８１ａとＳ極８１ｂとが配列される。すなわち、Ｎ極８１ａは、第１分割コア４３ａの第１突出部４２ａと空隙を介して対向し、Ｓ極８１ｂは、第２分割コア４３ｂの第２突出部４２ｂと空隙を介して対向する。 Further, in the arc extinguishing unit 25B, the north pole 81a and the south pole 81b are arranged in the direction in which the side plate portion 41a and the side plate portion 41b face each other. That is, the N pole 81a faces the first protruding portion 42a of the first split core 43a via a gap, and the S pole 81b faces the second protruding portion 42b of the second split core 43b via a gap.
　ここで、永久磁石８１のＮ極８１ａと第１分割コア４３ａとの最短距離を「Ｄ１」とし、永久磁石８１のＳ極８１ｂと第２分割コア４３ｂとの最短距離を「Ｄ２」とし、アークランナ８０と永久磁石８１との最短距離を「Ｄ３」とする。実施の形態３にかかる消弧ユニット２５Ｂでは、Ｄ１＜Ｄ３およびＤ２＜Ｄ３を満たすように、永久磁石８１が配置されている。このように、永久磁石８１を配置することで、図１９に示すように、磁場の向き９２が紙面における半時計回りの方向になる。 Here, the shortest distance between the N pole 81a of the permanent magnet 81 and the first split core 43a is "D1", the shortest distance between the S pole 81b of the permanent magnet 81 and the second split core 43b is "D2", and the arc runner The shortest distance between the 80 and the permanent magnet 81 is defined as "D3". In the arc extinguishing unit 25B according to the third embodiment, the permanent magnets 81 are arranged so as to satisfy D1 <D3 and D2 <D3. By arranging the permanent magnets 81 in this way, as shown in FIG. 19, the direction 92 of the magnetic field becomes a counterclockwise direction on the paper surface.
　また、可動接点２６と固定接点７１とはＺ軸方向で互いに対向しているため、電流が流れる向き９１は、図１９に示すように、Ｚ軸負方向である。 Further, since the movable contact 26 and the fixed contact 71 face each other in the Z-axis direction, the direction 91 in which the current flows is the Z-axis negative direction as shown in FIG.
　このように、電流が流れる向き９１および磁場の向き９２が決まっていることから、フレミング左手の法則により、アークが駆動される方向である駆動方向９３は、図１９に示す方向になる。すなわち、アークは、可動接点２６および固定接点７１から消弧装置３０へ向かう方向に駆動される。 Since the direction 91 in which the current flows and the direction 92 in the magnetic field are determined in this way, the driving direction 93, which is the direction in which the arc is driven, is the direction shown in FIG. 19 according to Fleming's left-hand rule. That is, the arc is driven in the direction from the movable contact 26 and the fixed contact 71 toward the arc extinguishing device 30.
　アークランナ８０はアークの駆動電路となるため、遮断時における電流の大きさによってはアークランナ８０が消耗し、アークランナ８０における磁気抵抗値の変化によって磁力が変化する可能性がある。消弧ユニット２５Ｂでは、図１９に示す永久磁石８１の配置によって、磁力線は主にコア４０Ａを通過する。コア４０Ａは、遮断によっては摩耗しないことから、消弧ユニット２５Ｂでは安定してアークに駆動力を与えることができる。 Since the arc runner 80 serves as an arc drive electric circuit, the arc runner 80 may be consumed depending on the magnitude of the current at the time of interruption, and the magnetic force may change due to a change in the magnetic resistance value of the arc runner 80. In the arc extinguishing unit 25B, the lines of magnetic force mainly pass through the core 40A due to the arrangement of the permanent magnets 81 shown in FIG. Since the core 40A does not wear due to interruption, the arc extinguishing unit 25B can stably apply a driving force to the arc.
　以上のように、実施の形態３にかかる消弧ユニット２５Ｂにおいて、永久磁石８１は、Ｎ極８１ａとＳ極８１ｂとが一対の側板部４１ａ，４１ｂが互いに対向する方向であるＸ軸方向に配列される。また、永久磁石８１は、第１突出部４２ａおよび第２突出部４２ｂの各々との距離Ｄ１，Ｄ２がアークランナ８０との距離Ｄ３よりも短い。これにより、一対の側板部４１ａ，４１ｂの一方から他方へ向かう磁場が形成され、磁力線が主にコア４０Ａを通過する。そのため、消弧ユニット２５Ｂでは安定してアークに駆動力を与えることができる。 As described above, in the arc extinguishing unit 25B according to the third embodiment, the permanent magnets 81 are arranged in the X-axis direction in which the north pole 81a and the south pole 81b are in the direction in which the pair of side plate portions 41a and 41b face each other. Will be done. Further, in the permanent magnet 81, the distances D1 and D2 from each of the first protruding portion 42a and the second protruding portion 42b are shorter than the distance D3 from the arc runner 80. As a result, a magnetic field is formed from one of the pair of side plate portions 41a and 41b toward the other, and the magnetic field lines mainly pass through the core 40A. Therefore, the arc extinguishing unit 25B can stably apply a driving force to the arc.
　また、永久磁石８１は、開口部４４に配置されることから、距離Ｄ１，Ｄ２を短くすることができ、消弧ユニット２５Ｂではより安定してアークに駆動力を与えることができる。 Further, since the permanent magnet 81 is arranged in the opening 44, the distances D1 and D2 can be shortened, and the arc extinguishing unit 25B can give a driving force to the arc more stably.
　以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
　１　筐体、２　回路遮断ユニット、３　開閉機構部、４　クロスバー、１１　ベース、１２　カバー、２１　可動接触子、２２　可動接触子ホルダ、２３　引き外し装置、２４　負荷側導体、２５，２５Ａ，２５Ｂ　消弧ユニット、２６　可動接点、２７　操作ハンドル、３０　消弧装置、３１　グリッド部、３２　支持板、３３　可動子ストッパ、３４　グリッド板、３４ａ　側足部、３４ｂ　カシメ部、３５　切り欠き、４０，４０Ａ　コア、４１，４１ａ，４１ｂ　側板部、４２，４２Ａ　シールド部、４２ａ　第１突出部、４２ｂ　第２突出部、４３ａ　第１分割コア、４３ｂ　第２分割コア、４４　開口部、５０　絶縁部材、５１　側部、５２　カバー部、５３　シールド部カバー、６０　固定接触子、７０　導電部材、７１　固定接点、７２　電源側端子、７３　第１電路、７４　第２電路、７４ａ　平行電路、７４ｂ　傾斜電路、７４ｃ　接続電路、７５　第３電路、７６　第４電路、７７　空間部、７８　ネジ、８０　アークランナ、８１　永久磁石、８１ａ　Ｎ極、８１ｂ　Ｓ極、９１　電流が流れる向き、９２　磁場の向き、９３　駆動方向、１００，１００Ａ，１００Ｂ　回路遮断器、Ｄ１，Ｄ２，Ｄ３　距離。 1 housing, 2 circuit cutoff unit, 3 opening / closing mechanism, 4 crossbar, 11 base, 12 cover, 21 movable contact, 22 movable contact holder, 23 tripping device, 24 load side conductor, 25, 25A, 25B Arc extinguishing unit, 26 movable contacts, 27 operation handles, 30 arc extinguishing devices, 31 grid parts, 32 support plates, 33 mover stoppers, 34 grid plates, 34a side feet, 34b caulking parts, 35 notches, 40, 40A Core, 41, 41a, 41b side plate part, 42, 42A shield part, 42a first protrusion, 42b second protrusion, 43a first division core, 43b second division core, 44 opening, 50 insulation member, 51 side Part, 52 cover part, 53 shield part cover, 60 fixed contact, 70 conductive member, 71 fixed contact, 72 power supply side terminal, 73 1st electric circuit, 74 2nd electric circuit, 74a parallel electric circuit, 74b inclined electric circuit, 74c connecting electric circuit , 75 3rd electric circuit, 76 4th electric circuit, 77 space part, 78 screw, 80 arc runner, 81 permanent magnet, 81a N pole, 81b S pole, 91 current flow direction, 92 magnetic field direction, 93 drive direction, 100, 100A, 100B circuit breaker, D1, D2, D3 distance.

Claims (6)

  1. 　一端側に固定接点が設けられ、他端側に電源側端子が設けられる導電部材と、
    　前記固定接点と対向する可動接点が設けられる可動接触子と、
    　前記固定接点と前記可動接点との間に発生するアークを消弧する複数のグリッド板を有するグリッド部と、
    　互いに対向する一対の側板部を有し、前記一対の側板部間に前記グリッド部が配置されるコアと、
    　前記導電部材に接続され、前記アークを駆動するアークランナと、
    　前記可動接触子が前記グリッド部と対向する方向または前記一対の側板部が対向する方向に極性が互いに異なる２つの磁極が配列される永久磁石と、を備える
    　ことを特徴とする回路遮断器。     A conductive member with a fixed contact on one end and a power supply terminal on the other end.
    Movable contacts provided with movable contacts facing the fixed contacts,
    A grid portion having a plurality of grid plates for extinguishing an arc generated between the fixed contact and the movable contact,
    A core having a pair of side plate portions facing each other and the grid portion arranged between the pair of side plate portions.
    An arc runner connected to the conductive member and driving the arc,
    A circuit breaker comprising: a permanent magnet in which two magnetic poles having different polarities are arranged in a direction in which the movable contactor faces the grid portion or in a direction in which the pair of side plate portions face each other.
  2. 　前記コアは、
    　前記グリッド部と前記電源側端子との間に配置され、一部に開口部を有する領域を有する
    　ことを特徴とする請求項１に記載の回路遮断器。     The core is
    The circuit breaker according to claim 1, wherein the circuit breaker is arranged between the grid portion and the power supply side terminal and has a region having an opening in a part thereof.
  3. 　前記永久磁石は、
    　前記グリッド部と対向する方向に極性が互いに異なる２つの磁極が配列され、且つ前記可動接点から前記固定接点へ向かう方向を下方とした場合に、前記アークランナの下方に配置される
    　ことを特徴とする請求項１または２に記載の回路遮断器。     The permanent magnet is
    It is characterized in that two magnetic poles having different polarities are arranged in a direction facing the grid portion, and are arranged below the arc runner when the direction from the movable contact to the fixed contact is downward. The circuit breaker according to claim 1 or 2.
  4. 　前記コアは、
    　前記一対の側板部のうち一方の側板部と、前記一方の側板部の端部から他方の側板部へ近づく方向へ突出する第１突出部とを有する第１分割コアと、
    　前記他方の側板部と、前記他方の側板部の端部から前記一方の側板部へ近づく方向へ突出する第２突出部とを有する第２分割コアとを備え、
    　前記第１突出部と前記第２突出部とは、前記一対の側板部の対向方向で互いに対向し、
    　前記開口部は、前記第１突出部と前記第２突出部との間に形成される
    　ことを特徴とする請求項２に記載の回路遮断器。     The core is
    A first divided core having a side plate portion of one of the pair of side plate portions and a first protruding portion protruding from an end portion of the one side plate portion in a direction approaching the other side plate portion.
    A second split core having a other side plate portion and a second protruding portion protruding from an end portion of the other side plate portion in a direction approaching the one side plate portion.
    The first protruding portion and the second protruding portion face each other in the opposite directions of the pair of side plate portions.
    The circuit breaker according to claim 2, wherein the opening is formed between the first protrusion and the second protrusion.
  5. 　前記永久磁石は、
    　前記一対の側板部が互いに対向する方向に前記２つの磁極が配列され、且つ前記第１突出部および前記第２突出部の各々との距離が前記アークランナとの距離よりも短い
    　ことを特徴とする請求項４に記載の回路遮断器。     The permanent magnet is
    The two magnetic poles are arranged in a direction in which the pair of side plate portions face each other, and the distance between the first protruding portion and the second protruding portion is shorter than the distance from the arc runner. The circuit breaker according to claim 4.
  6. 　前記永久磁石は、前記開口部に配置される
    　ことを特徴とする請求項５に記載の回路遮断器。     The circuit breaker according to claim 5, wherein the permanent magnet is arranged in the opening.
PCT/JP2019/015167 2019-04-05 2019-04-05 Circuit breaker WO2020202558A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201980094767.6A CN113632193A (en) 2019-04-05 2019-04-05 Circuit breaker
JP2021511059A JP7076635B2 (en) 2019-04-05 2019-04-05 Circuit breaker
PCT/JP2019/015167 WO2020202558A1 (en) 2019-04-05 2019-04-05 Circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/015167 WO2020202558A1 (en) 2019-04-05 2019-04-05 Circuit breaker

Publications (1)

Publication Number Publication Date
WO2020202558A1 true WO2020202558A1 (en) 2020-10-08

Family

ID=72666527

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/015167 WO2020202558A1 (en) 2019-04-05 2019-04-05 Circuit breaker

Country Status (3)

Country Link
JP (1) JP7076635B2 (en)
CN (1) CN113632193A (en)
WO (1) WO2020202558A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS3621001Y1 (en) * 1960-08-03 1961-08-15
JPH07320624A (en) * 1994-05-24 1995-12-08 Fuji Electric Co Ltd Arc extinguishing apparatus of circuit breaker
WO2013108291A1 (en) * 2012-01-18 2013-07-25 三菱電機株式会社 Circuit breaker
JP2017201623A (en) * 2016-05-06 2017-11-09 カーリング テクノロジーズ、 インコーポレイテッドＣａｒｌｉｎｇ Ｔｅｃｈｎｏｌｏｇｉｅｓ， Ｉｎｃ． Arc motivation device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS3621001Y1 (en) * 1960-08-03 1961-08-15
JPH07320624A (en) * 1994-05-24 1995-12-08 Fuji Electric Co Ltd Arc extinguishing apparatus of circuit breaker
WO2013108291A1 (en) * 2012-01-18 2013-07-25 三菱電機株式会社 Circuit breaker
JP2017201623A (en) * 2016-05-06 2017-11-09 カーリング テクノロジーズ、 インコーポレイテッドＣａｒｌｉｎｇ Ｔｅｃｈｎｏｌｏｇｉｅｓ， Ｉｎｃ． Arc motivation device

Also Published As

Publication number Publication date
JP7076635B2 (en) 2022-05-27
JPWO2020202558A1 (en) 2021-10-14
CN113632193A (en) 2021-11-09

Similar Documents

Publication Publication Date Title
EP2919248B1 (en) Electromagnetic relay
WO2012020526A1 (en) Circuit breaker
US10056200B2 (en) Electromagnetic contactor
KR101624440B1 (en) Circuit breaker
KR101678288B1 (en) Circuit breaker for direct-current circuit and circuit breaker device for direct-current circuit
JP6103489B2 (en) Arc extinguishing mechanism of DC switch, DC switch and DC circuit breaker having the arc extinguishing mechanism
EP2777058B1 (en) Electrical switching apparatus including magnet assembly and first and second arc chambers
JP2009054389A (en) Circuit breaker
JP5515719B2 (en) Circuit breaker
US9196433B2 (en) Electromagnetic switch
JP2012174686A (en) Circuit breaker with arc-extinguishing part
KR101031975B1 (en) Arc extinguishing apparatus for direct current switch
JP2012138173A (en) Circuit breaker
JPH11297180A (en) Circuit breaker
KR101232453B1 (en) Circuit breaker
JP7076635B2 (en) Circuit breaker
EP1414057B1 (en) Air circuit breaker
JP6966002B2 (en) Circuit breaker
JP6044927B2 (en) DC switch and DC circuit breaker
JP2013125635A (en) Circuit breaker
JP5488353B2 (en) Circuit breaker
KR20230011113A (en) Arc extinguish part and circuit breaker part and air circuit breaker include the same
KR101098930B1 (en) Moving breaking contact unit of moldedcase circuit breaker
JP6198450B2 (en) Switch
KR20220155092A (en) Circuit breaker part and air circuit breaker include the same

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19923389

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021511059

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19923389

Country of ref document: EP

Kind code of ref document: A1