JP6474976B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker.

Conventionally, a circuit breaker having a stator, a mover held by a rotatable movable holder, and an arc extinguishing device having an arc extinguishing grid is used, as in the circuit breaker of the circuit breaker of Patent Document 1. ing. In the circuit breaker when the load current is energized, the stator and the movable element are closed, and the fixed contact of the stator and the movable contact of the movable element are in contact with each other, and the conductive state is maintained. On the other hand, in the circuit breaker during the OFF operation, the stator and the mover are opened, the fixed contact and the movable contact are opened apart from each other, and an arc is generated between them. The generated arc is drawn into the arc extinguishing device and extinguished.
Here, when a DC short-circuit current generated in a DC power generation facility such as a solar power generation facility is interrupted, there is no current zero point in the DC current unlike an AC current, so that the zero point is waited like an AC interrupt. Without interruption, it is extremely important to quickly cut the current limit by increasing the arc voltage to the power supply voltage that is the system voltage, that is, to quickly cut off the high-voltage short-circuit current.

  Therefore, in order to increase the opening distance for the purpose of increasing the arc voltage, a method of enlarging the arc greatly by increasing the rotation radius of the mover can be considered. For example, in the case of Patent Document 1, the rotation radius of the mover includes the length (radius) from the axis of the movable holder to the side surface holding the mover, and the length from the side surface of the movable holder to the movable contact (movable of the mover). And the length of the portion held on the side surface of the holder). Therefore, by increasing the length of the portion held on the side surface of the movable holder of the mover, it is possible to increase the arc radius. However, if the part of the mover held on the side surface of the movable holder is lengthened to increase the arc radius, the circuit breaker needs to have a larger space for accommodating the breaker. There arises a problem that the size of the device increases.

JP 2007-052942 A

  The present invention has been made paying attention to the above-described problems, and an object thereof is to provide a circuit breaker capable of interrupting a high-voltage short-circuit current without increasing the size.

  In order to solve the above problems, a circuit breaker according to an aspect of the present invention includes a movable holder whose surface is made of an insulator and is rotatably supported, a stator having a fixed contact, and a fixed contact. A movable contact that is attached to the movable holder so that only the end provided with the movable contact on the side surface of the movable holder is exposed, and rotates between the movable holder and the stator and the movable element. And an arc-extinguishing device that extinguishes the arc generated.

  Therefore, according to the circuit breaker of this invention, it can be set as the circuit breaker which can interrupt | block high voltage short circuit current, without enlarging.

It is a perspective view explaining the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention from the left side upper surface. It is a perspective view explaining the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention from the right side upper surface. It is a perspective view explaining the inside of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention from the left side lower surface. It is a perspective view explaining the inside of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention from the right side upper surface. It is a front view of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention. It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 1). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 2). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 3). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 4). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 5). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 6). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 7). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 8). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 9). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 10). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 11). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 12). It is a side view explaining the operation | movement of the interruption | blocking part of the circuit breaker which concerns on embodiment of this invention (the 13).

  Embodiments of the present invention will be described below. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each member, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings. Also, the directions of “left and right” and “up and down” in the following description are merely definitions for convenience of description, and do not limit the technical idea of the present invention. Thus, for example, if the paper is rotated 90 degrees, “left and right” and “up and down” are read interchangeably, and if the paper is rotated 180 degrees, “left” becomes “right” and “right” becomes “left”. Of course.

A circuit breaker according to an embodiment of the present invention includes a casing (not shown), a blocking unit 10 (see FIGS. 1 and 2), and an opening / closing mechanism (not shown). The housing is composed of an insulating material case and a cover, and houses the blocking portion 10 and the opening / closing mechanism. The opening / closing mechanism is coupled to the movable holder 4 of the blocking unit 10, and the movable holder 4 rotates based on the opening / closing operation by the opening / closing mechanism.
As shown in FIGS. 1 and 2, the blocking portion 10 is inserted into a main body frame 30 having a partition wall 31, a top portion 32, and a bottom portion 33, and a hole (see FIGS. 3 and 4) provided in the partition wall 31. And a cylindrical movable holder 4 that is fixed to the shaft 5 and rotatably supported by the housing around the shaft 5 (see FIGS. 7, 9, 11, and 13). Further, as shown in FIG. 6, the blocking portion 10 is configured so that only two tips 22 a and 22 b provided with two movable contacts 21 a and 21 b are exposed on the circumferential surface of the side surface of the movable holder 4. The mover 2 having a part embedded inside is provided.

  As shown in FIGS. 1 and 3, the blocking unit 10 includes a first fixed contact 11 a to which the first movable contact 21 a contacts and separates, and a load side terminal 12 a connected to the load side. A stator 1a is provided. Moreover, the interruption | blocking part 10 has the 1st arc runner 19 attached to the load side terminal 12a. Further, as shown in FIGS. 2 and 4, the blocking unit 10 includes a second fixed contact 11 b to which the second movable contact 21 b contacts and separates, and a power receiving side terminal 12 b connected to the power source side. A stator 1b is provided. Moreover, the interruption | blocking part 10 has the 2nd arc runner 29 attached to the receiving side terminal 12b.

  Moreover, as shown in FIGS. 1-4, the interruption | blocking part 10 is the 1st arc extinguishing apparatus 15 which extinguishes the arc generate | occur | produced between the 1st fixed contact 11a and the 1st movable contact 21a at the time of an electric current interruption. A first arc extinguishing chamber 14 is provided. Moreover, the interruption | blocking part 10 has the 2nd arc extinguishing chamber 24 which has the 2nd arc extinguishing apparatus 25 which extinguishes the arc which generate | occur | produces between the 2nd fixed contact 11b and the 2nd movable contact 21b at the time of electric current interruption. Prepare. The first arc-extinguishing device 15 and the second arc-extinguishing device 25 are arranged on the opposite sides of the movable holder 4 from the first movable contact 21a and the second movable contact 21b, respectively, and the blocking portion 10 is compact. It is configured. Further, as shown in FIGS. 15 and 16, the blocking unit 10 includes a first stopper 18 and a second stopper 28 that restrict the rotation range of the mover 2 with a partition wall 31 of the main body frame 30 interposed therebetween. The mover 2 is configured to be freely movable between the first stopper 18 and the second stopper 28.

  As shown in FIGS. 1 to 4, the main body frame 30 has a rectangular shape so as to stand vertically between a rectangular flat plate-like top portion 32 and a bottom portion 33 that are horizontally spaced apart in the vertical direction. A flat partition wall 31 is provided. The entire top surface of the top portion 32 is horizontal, but one end side in the longitudinal direction of the bottom portion 33 is bent upward, and then bent again in parallel with the top portion 32 to provide an inclined portion. The partition wall 31, the top portion 32, and the bottom portion 33 are integrally formed.

  Further, when the main body frame 30 is viewed from one end face side in the longitudinal direction, the end face of the main body frame 30 has an I-shape due to the end face of the partition wall 31, the end face of the top portion 32, and the end face of the bottom portion 33, as shown in FIG. Show. That is, the space between the top and bottom of the top 32 and the bottom 33 is divided into two on the left and right by the partition wall 31. Except for the first stator 1a and the second stator 1b, the blocking portion 10 is configured symmetrically about the partition wall 31. 5 is defined as the “front side” of the blocking unit 10, and in the following description of each direction of the blocking unit 10, the terms “front”, “left”, “right”, “left”, “left”, “right” Is used.

  FIG. 6 shows an internal state in which the left side wall 17 (see FIG. 1) of the first arc extinguishing chamber 14 is omitted when the blocking part 10 is viewed from the left side. The movable holder 4 has a substantially cylindrical shape, and as shown in FIG. 6, the shaft 5 is horizontally placed in a hole formed at a slightly rearward position in the center in the height direction of the partition wall 31 of the main body frame 30. It is inserted. That is, when the blocking portion 10 is viewed from the side, the bottom surface of the column of the movable holder 4 appears on the front as shown in FIG. The side surface of the cylinder of the movable holder 4 is a smooth circumferential surface, and the surface and the inside of the movable holder 4 are made of an insulator. The insulator is preferably a resin that generates ablation gas when heated. For example, a resin such as polyamide 66 (PA66) or polyoxymethylene (POM) is suitably used as the insulator according to the embodiment of the present invention. .

  Further, for example, an opening / closing mechanism having an operation handle (not shown) rotatably supported is connected to the bottom surface of the column of the movable holder 4, and the movable holder 4 is configured to rotate as the operation handle rotates. . In addition, the shape of the movable holder 4 is not limited to a cylinder having a perfect circle as a bottom surface, and may be, for example, a columnar shape having a bottom surface shaped like an outline of an egg. Further, a shaft may be provided at the center, and the inside may be a hollow cylinder. The movable holder has a bottom surface having a smoothly curved arc portion, as long as the arc can be extended on the side surface having the surface of the insulator, and the shape may be changed as appropriate.

  3 and 4 are diagrams showing the inside of the blocking unit 10 with the illustration of the movable holder 4 omitted. As shown in FIGS. 3 and 4, the mover 2 has a bridge portion 22 to which two movable contacts 21 a and 21 b are attached, and the bridge portion 22 forms the main body of the mover 2. The bridging portion 22 is configured such that the end on the side opposite to the movable holder 4 is branched into two tips 22a and 22b by bending the plate-like member into a U shape (U shape). . The mover 2 is embedded in the movable holder 4 so that the partition wall 31 is positioned in the U-shaped recess of the bridge portion 22 (see FIG. 6), so that the bridge portion 22 and the partition wall 31 do not interfere with each other. Is provided with a predetermined clearance.

  The first movable contact 21a is fixed to the surface of one of the two tips 22a facing the first fixed contact 11a so as to come into contact with the first fixed contact 11a in the input state. Yes. The second movable contact 21b is fixed to the surface of the other tip 22b opposite to the second fixed contact 11b so as to come into contact with the second fixed contact 11b in the input state. ing. At the time of opening, separate arcs are generated between the first fixed contact 11a and the first movable contact 21a and between the second fixed contact 11b and the second movable contact 21b.

  Further, as shown in FIGS. 1, 2, 6, and 7, the mover 2 has a central portion other than the two branched ends 22 a and 22 b of the bridge portion 22 embedded in the movable holder 4. Only the two tips 22 a and 22 b are exposed on the side surface (circumferential surface) of the movable holder 4. Further, the two movable contacts 21 a and 21 b can be arranged at a position very close to the side surface of the movable holder 4. Then, the two movable contacts 21a and 21b rotate integrally with the movable holder 4, whereby the circuit on the power source side and the circuit on the load side are connected or interrupted.

  Since the two movable contacts 21 a and 21 b are disposed close to the side surface of the movable holder 4 at the time of opening to interrupt the current, each arc between the two fixed contacts 11 a and 11 b is synchronized with the rotation of the movable holder 4. And is extended so as to be close to the side surface of the movable holder 4. The part where the arc on the side surface of the movable holder 4 is close is heated by the heat of the arc, the insulator contained in the surface is melted, and ablation gas is generated.

  Here, the distance between the side surface of the movable holder 4 and the two movable contacts 21a and 21b is preferably set to be 0 mm or more and 5 mm or less. When the interval is zero, it means that the two movable contacts 21 a and 21 b are located on the side surface of the movable holder 4. When the interval exceeds 5 mm, it takes time until the arc approaches the side surface of the movable holder 4 when the mover 2 rotates, and there is a possibility that the ablation gas ejected from the movable holder 4 cannot be effectively used as will be described later.

  As shown in FIG. 6, the load-side terminal 12a of the first stator 1a is made of a plate-like member, and the plate-like member extends while bending to constitute a current path. In FIG. 6, the load side is attached so as to extend along the lower surface of the bottom 33 of the main body frame 30 from the front side (right side in FIG. 6) to the rear side (left side in FIG. 6). ing. A part of the current path formed by the load side terminal 12 a rises upward on the left side of the lower surface of the bottom 33 of the main body frame 30. That is, in FIG. 6, the rear end portion of the load side terminal 12 a is bent upward at an angle of about 90 degrees along the rear end surface of the bottom portion 33, and then rises at the height of the two movable contacts 21 a and 21 b. Furthermore, it is bent at an angle of about 45 degrees toward the movable holder 4 side. By being bent at an angle of about 45 degrees, the rear end surface of the load side terminal 12 a is positioned in the vicinity of the side surface so as to face the side surface of the movable holder 4. The first fixed contact 11a is fixed to the surface on the side facing the first movable contact 21a at the rear end of the load side terminal 12a.

  The distance between the rear end surface of the load side terminal 12a and the side surface of the movable holder 4 is set to a very small distance so that the first fixed contact 11a contacts the movable holder 4 and does not hinder the rotation of the movable holder 4. Yes. In addition, the angle with respect to the horizontal surface (or vertical surface) of the bending part in the height of the two movable contacts 21a and 21b of the load side terminal 12a may be set as appropriate, and the bending part according to the embodiment of the present invention is 45. It is considered a degree. Since the movable element 2 is positioned parallel to the bent part when the blocking part 10 is viewed from the side, the angle of the bent part with respect to the horizontal plane (or vertical plane) is 45 degrees, so that the horizontal plane (or the movable element 2) The angle with respect to the vertical plane is also 45 degrees.

  As shown in FIGS. 2 and 4, the power receiving side terminal 12 b of the second stator 1 b is configured by a plate-like member provided on the rear side of the main body frame 30 on the power source side. As shown in FIG. 5, the power receiving side terminal 12 b is displaced and attached to the right side so as not to overlap with the load side terminal 12 a in the left-right direction when the blocking unit 10 is viewed from the front. As shown in FIGS. 2, 4 and 10, the power receiving side terminal 12b is bent upward at an angle of about 90 degrees in the same manner as the load side terminal 12a at the position on the right side of the rear end portion of the bottom 33. After rising, it is further bent toward the movable holder 4 at the height of the two movable contacts 21 a and 21 b, and is positioned near the side surface so that the rear end surface faces the side surface of the movable holder 4. The second fixed contact 11b is fixed to the surface of the rear end portion of the power receiving side terminal 12b facing the second movable contact 21b. That is, the end part side which goes to the side surface direction of the movable holder 4 from the bending part of the power receiving side terminal 12b is comprised symmetrically with the load side terminal 12a.

  As shown in FIG. 6, the first arc extinguishing chamber 14 is provided in a space on the left side of the partition wall 31, and the first fixed contact 11 a and the first movable contact 21 a located on the rear side in the space The arc generated during the period is extinguished. As shown in FIGS. 1, 3 and 5, the first arc extinguishing chamber 14 includes a right side wall 16 attached to the left side surface of the partition wall 31, and a left side provided in parallel with the right side wall 16 apart from the right side wall 16. It has a wall 17 and a first arc extinguishing device 15 provided between the two side walls 16, 17. In the embodiment of the present invention, the first arc extinguishing device 15 is composed of a plurality of grids that are spanned between the two side walls 16 and 17.

  As shown in FIGS. 1 to 4, each of the right side wall 16 and the left side wall 17 of the first arc extinguishing chamber 14 is a U-shaped flat plate so that the U shape opens on the rear side of the blocking portion 10. The movable holder 4 is inserted into the U-shaped recess. As shown in FIG. 6, the contour line forming the U-shaped concave portion appears as an arc cut at a central angle of about 180 degrees out of a perfect circle along the contour of the side surface of the movable holder 4. A very small clearance is provided between the U-shaped recess and the side surface (circumferential surface) of the movable holder 4 so as not to prevent the rotation of the movable holder 4. That is, the movable holder 4 is provided adjacent to the inside of the first arc extinguishing chamber 14, and is provided so as to protrude outward from the side surface of the movable holder 4 as shown in FIGS. The trajectory of rotation of the first movable contact 21 a passes through the inside of the U-shape of the first arc extinguishing chamber 14.

  Inside the first arc extinguishing chamber 14, as shown in FIG. 6, a plurality of flat plate-like grids are mounted vertically at equal intervals with the main surface horizontal. The length in the front-rear direction of each grid is the longest in the lowermost grid closest to the bottom 33 of the main body frame 30 and the uppermost grid closest to the top 32 of the main body frame 30. Further, the length in the front-rear direction of the center two grids among the plurality of grids is the shortest, and the length of each grid is configured to become shorter from the lowest level or the highest level toward the center.

  The position of the rear end of the lowermost grid in the front-rear direction is substantially the same as the tip of the mover 2 at the contact position between the first movable contact 21a and the first fixed contact 11a at a rotation angle of 0 degrees. Position. Further, the position in the front-rear direction of the rear end portion of the uppermost grid is substantially the same as the position of the tip of the movable element 2 when the rotation angle is 270 degrees (see FIG. 15). That is, the first arc extinguishing device 15 has a vertically symmetric configuration, and each grid uses at least one of the upper surface, the lower surface, and the rear end surface to form the rotation range of the movable element 2 on the side surface of the movable holder 4. Are provided on the lower side, the front side and the upper side of the movable holder 4 so as to face each other.

  The second arc extinguishing chamber 24 extinguishes an arc generated between the second fixed contact 11b and the second movable contact 21b located on the rear side of the space on the right side of the partition wall 31. As shown in FIG. 5, the second arc extinguishing chamber 24 is provided in a space on the right side of the partition wall 31 with the first arc extinguishing chamber 14 and the partition wall 31 of the main body frame 30 sandwiched therebetween, and the space on the left side of the partition wall 31. The first arc extinguishing chamber 14 is symmetrically configured. In other words, the first arc extinguishing chamber 14 has a left side wall 26 corresponding to the right side wall 16, and the first arc extinguishing chamber 14 has a right side wall 27 corresponding to the left side wall 17. A second arc extinguishing device 25 is provided corresponding to the first arc extinguishing device 15 of the chamber 14, and the second arc extinguishing device 25 is composed of a plurality of grids.

  As shown in FIGS. 1, 3 and 6, the first arc runner 19 is fixed to the surface on the side facing the bridging portion 22 of the movable part 2 of the vertical portion on the rear side of the load side terminal 12a. A plate-like member having conductivity. The upper end portion of the first arc runner 19 is close to the first fixed contact 11a of the first stator 1a with a slight separation. The lower end portion of the first arc runner 19 is fixed to the rear end portion of the upper surface of the bottom portion 33 of the main body frame 30 and the rear end portion of the lowermost grid of the first arc extinguishing chamber 14. And are located in close proximity to each other. That is, the first arc runner 19 expands the thickness of the rear vertical portion of the load side terminal 12a to the first fixed contact 11a side and the lowermost grid side of the first arc extinguishing chamber 14 to load the load side terminal 12a. Each of the distance between 12a and the first fixed contact 11a and the distance between the lowermost grid is reduced.

  When the arc between the first fixed contact 11a and the first movable contact 21a is extended when the first arc runner 19 is opened, the end of the arc on the first fixed contact 11a side is The first fixed contact 11 a is commutated to the first arc runner 19. Further, the arc commutated to the first arc runner 19 is commutated from the first arc runner 19 to the lowermost grid of the first arc extinguishing chamber 14. By causing one end of the arc to flow from the first fixed contact 11a to the first arc runner 19, it is possible to prevent the first fixed contact 11a from being worn out by the heat of the arc. Further, the arc is commutated from the first arc runner 19 to the lowermost grid, so that the end of the arc on the first fixed contact 11a side follows the rotating first movable contact 21a. It is possible to promote a gentle movement in the moving direction of one movable contact 21a.

  As shown in FIGS. 2 and 4, the second arc runner 29 is provided in the space on the right side of the partition wall 31, and is configured symmetrically with the first arc runner 19 in the space on the left side of the partition wall 31. Yes. Similarly to the first arc runner 19, the second arc runner 29 also has the thickness of the vertical part on the rear side of the power receiving side terminal 12 b on the second fixed contact 11 b side and the lowest stage of the second arc extinguishing chamber 24. It is extended to the grid side to promote arc commutation.

  The first stopper 18 is formed into a three-dimensional shape having eight sides by an insulator, and is attached to the rear side of the left side surface of the partition wall 31 of the main body frame 30 as shown in FIG. The first stopper 18 has a front surface that faces the side surface of the movable holder 4, an upper inclined surface that is positioned between the front surface and the upper surface, and a lower inclined surface that is positioned between the front surface and the lower surface. . When the first stopper 18 is viewed from the side, the contour of the front surface appears along a contour of the side surface of the movable holder 4 and appears as an arc cut at a central angle of about 90 degrees out of the perfect circle on the bottom surface of the movable holder 4. . A very small clearance is provided between the front surface of the first stopper 18 and the side surface of the movable holder 4 so as not to prevent the rotation of the movable holder 4.

  The lower inclined surface of the first stopper 18 is inclined at about 45 degrees with respect to the horizontal surface (or vertical surface), and is disposed in contact with the bent portion of the load side terminal 12a of the first stator 1a. ing. Therefore, the lower inclined surface of the first stopper 18 defines a position where the mover 2 starts to rotate together with the bent portion of the load side terminal 12a of the first stator 1a. On the other hand, the upper inclined surface of the first stopper 18 is inclined at about 45 degrees with respect to the horizontal plane (or vertical surface) and is close to the rear end on the upper side of the first arc extinguishing chamber 14. As shown in FIG. 15, when the movable holder 4 rotates, the upper inclined surface of the first stopper 18 comes into contact with the surface of the bridging portion 22 opposite to the first movable contact 21 a and stops. Position. Therefore, the upper inclined surface of the first stopper 18 defines a position where the rotation of the mover 2 ends. That is, the mover 2 rotates in an obtuse angle side of the region divided by intersecting the two upper and lower inclined surfaces of the first stopper 18, and is controlled by the first stopper 18. The upper limit angle of the range is 270 degrees.

  As shown in FIGS. 2 and 4, the second stopper 28 is provided in the space on the right side of the partition wall 31, and is configured symmetrically with the first stopper 18 in the space on the left side of the partition wall 31. Yes. That is, the upper inclined surface of the second stopper 28 corresponds to the upper inclined surface of the first stopper 18, and when the movable holder 4 is rotated, as shown in FIG. It is comprised so that the surface on the opposite side to the movable contact 21b may contact. The lower inclined surface of the second stopper 28 corresponds to the lower inclined surface of the first stopper 18 and is disposed in contact with the bent portion of the power receiving side terminal 12b of the second stator 1b. Yes. Similarly to the first stopper 18, the second stopper 28 also restricts the upper limit angle of the rotation range of the mover 2 to 270 degrees.

If the rotation range of the mover 2 is expanded, the arc length can be further extended in proportion to the rotation range, so that a large arc length can be obtained even with a compact structure. Therefore, the upper limit angle of the rotation range of the mover is preferably 180 degrees or more, and more preferably 270 degrees or more.
The circuit breaker according to the embodiment of the present invention including the blocking unit 10 configured as described above connects or disconnects the power supply side circuit and the load side circuit by the rotation of the movable holder 4. Further, when the short-circuit current is interrupted, an arc generated between the first fixed contact 11a and the first movable contact 21a by the first arc-extinguishing device 15 is also generated by the second arc-extinguishing device 25. Arcs generated between the contact 11b and the second movable contact 21b are quickly extinguished. The circuit breaker is configured to cut off the short-circuit current.

  Next, the operation of this circuit breaker will be described with reference to FIGS. In FIG. 6, at the time of energization of current, the mover 2 is driven by closing operation of the switching mechanism, and the first fixed contact 11a and the first movable contact 21a, the second fixed contact 11b and the second fixed contact are driven. The movable contacts 21b are in contact with each other. At this time, the current is supplied from the power receiving side terminal 12b to the second fixed contact 11b, the second movable contact 21b, the bridging portion 22, the first movable contact 21a, the first fixed contact 11a, and the load side terminal. It flows in the order of 12a.

  On the other hand, when the short-circuit current is interrupted, the two movable contacts 21a and 21b rotate away from the two fixed contacts 11a and 11b to the lower right in FIG. Immediately before the current interruption process, the current path is connected from the power receiving side terminal 12b to the second fixed contact 11b, the second movable contact 21b, the bridging portion 22, the first movable contact 21a, the first fixed contact 11a, It becomes the load side terminal 12a.

7 and 8 show a state inside the blocking portion 10 when the mover rotates 20 degrees counterclockwise from the closed position. In FIG. 8, the movable holder 4 that rotates by embedding the bridging portion 22 is not shown. As shown in FIG. 7, in the space on the left side of the body frame 30, a first arc _AL is generated between the first fixed contact 11a and the first movable contact 21a. As shown in FIG. 8, in the space on the right side of the main body frame 30, a second arc _AR is generated between the second fixed contact 11b and the second movable contact 21b. When the opening-pole operation of the movable member further advances, the first arc A _L and the second arc A _R is further extended.

Next, FIG. 9 and FIG. 10 show a state inside the blocking unit 10 when the mover 2 rotates 45 degrees counterclockwise from the closed position. As shown by the bridge portion 22 in the vertical state in FIG. 9, the two movable contacts 21 a and 21 b reach the lowest position in the left and right spaces of the main body frame 30. Mover 2, during the rotation from the state in FIG. 7 up to the state shown in FIG. 9, the first arc A _L is close to the side surface of the movable holder 4. Resin of the first arc A _L is the surface of the movable holder 4 in the vicinity is heated to the heat of the first arc A _L, ablation gas from the side of the movable holder 4 is generated in the direction indicated by the arrow in FIG. 9 . Generated ablation gas cools the first arc A _L and ejected toward the first arc A _L side, driven to push down the gas pressure to the lowermost grid of the first arcing chamber 14 Let By the action of the cooling effect and the gas pressure of the ablation gases, the first arc A _L is elongated. The end of the first fixed contact 11a side of the first arc A _L is driven by gas pressure to the commutation to the upper end of the first arc runner 19.
On the other hand, the second arc A _R shown in FIG. 10 in symmetry with the first arc A _L, extended by the action of the cooling action and the gas pressure of the ablation gas ejected from the movable holder 4. Also similarly to the first arc A _L, an end portion of the second fixed contact 11b side of the second arc A _R is commutated to the upper end of the second arc runner 29.

Next, FIG.11 and FIG.12 shows the state inside the interruption | blocking part 10 at the time of a needle | mover rotating 90 degree | times counterclockwise from the position at the time of closing. As shown by the position of the first movable contact 21 a in FIG. 11, the two movable contacts 21 a and 21 b are about ¼ from the bottom in the vertical width in the left and right spaces of the main body frame 30. Reach the height of each. Mover 2, the proximity of the state of FIG. 9 during rotation up to the state shown in FIG. 11, the side surface of the movable holder 4 of the first arc A _L, ablation gas from the side of the movable holder 4 11 Occurs in the direction indicated by the arrow inside.

Generated ablation gas ejected toward the first arc A _L side, further cooling the first arc A _L. The ablation gas, the first arc A _L by the gas pressure, further extruded extending the grid side of the lower side of the first arcing chamber 14 a plurality of grids disposed in the vertical direction. That is, the end portion of the first fixed contact 11a side of the first arc A _L is driven toward the lower end of the first arc runner 19, the central portion of the first arc A _L is the bottom of the grid Drive towards. The first end portion of the movable contact 21a side of the first arc A _L drives the grid side of the lower side including the lowermost grid. Therefore the first arc A _L is commutated to the lowermost grid of the first arcing chamber, as shown in FIG. 11, the arc A _{L 1} of the lower after the first, the first front of the arc A Divided into _L2 . The first rear lower arc A _L 1 is located between the lower end of the first arc runner 19 and the rear end face of the lowermost grid. The first front arc A _L 2 is located between the upper surface of the lowermost grid and the first movable contact 21a.

On the other hand, the second arc A _R shown in FIG. 10, the first arc A _L and symmetrically, further extended by the action of the cooling action and the gas pressure of the ablation gas ejected from the movable holder 4. Also similarly to the first arc A _L, the second end of the fixed contact 11b side of the second arc A _R is driven toward the lower end of the second arc runner 29, the second arc A _R Is driven toward the lowermost grid of the second arc extinguishing chamber 14. The second end of the movable contact 21b side of the second arc A _R drives the grid side of the lower side including the lowermost grid.

Therefore the second arc A _R is commutated to the lowermost grid of the second arcing chamber, as shown in FIG. 12, the arc A _{R 1} of the lower after the second, the second front arc A Divided into _R 2. The second rear lower arc A _R 1 is located between the lower end of the second arc runner 29 and the rear end face of the lowermost grid. The second front arc A _R 2 is located between the upper surface of the lowermost grid and the second movable contact 21b.

Next, FIGS. 13 and 14 show a state inside the blocking unit 10 when the mover 2 rotates 180 degrees counterclockwise from the position at the time of closing. As shown by the position of the first movable contact 21 a in FIG. 13, the two movable contacts 21 a and 21 b are about a little less than ¼ from the bottom in the vertical width within the space on the left and right sides of the main body frame 30. Reach the height of. While the mover 2 rotates from the state of FIG. 11 to the state of FIG. 13, the ablation gas from the side surface of the movable holder 4 due to the proximity of the first front arc A _L 2 to the side surface of the movable holder 4. Occurs as shown by the arrows in FIG.

Generated ablation gas ejected toward the arc A _{L 2} side of the first front from the movable holder 4, along with further cooling the arc A _{L 2} of the first front, the first front of the arc A by the gas pressure _L2 is pushed forward and extended. That is, the end of the first front arc A _L 2 opposite to the first movable contact 21a drives forward on the upper surface of the lowermost grid. The first rear lower arc A _L 1 is located between the lower end of the first arc runner 19 and the rear end face of the lowermost grid.

On the other hand, the second front-side arc A _R 2 shown in FIG. 14 is further extended by the action of the cooling action and gas pressure of the ablation gas ejected from the movable holder 4 in contrast to the first front-side arc A _L 2. To do. Further, due to the action of the gas pressure of the ablation gas, the end of the second front arc A _R 2 opposite to the second movable contact 21b is driven forward on the upper surface of the lowermost grid, and the second The arc A _R 2 on the front side is pushed forward and extends. The second rear lower arc A _R 1 is located between the lower end of the second arc runner 29 and the rear end face of the lowermost grid.

Next, FIG.15 and FIG.16 shows the state inside the interruption | blocking part 10 when the needle | mover 2 rotates 270 degree | times counterclockwise from the position at the time of closing. As shown by the position of the first movable contact 21a in FIG. 15, the two movable contacts 21a and 21b reach the rotation end position. While the mover 2 rotates from the state of FIG. 13 to the state of FIG. 15, the ablation gas from the side surface of the movable holder 4 due to the proximity of the first front arc A _L 2 to the side surface of the movable holder 4. Occurs as indicated by the arrows in FIG.

Generated ablation gas ejected toward the arc A _{L 2} side of the first front, further to cool the arc A _{L 2} of the first front. Further, the ablation gas is composed of a plurality of grids provided on the end of the first front arc A _L 2 on the first movable contact 21a side in the vertical direction of the first arc extinguishing chamber 14 by gas pressure. Push and extend further to the upper grid side.
That is, the end of the first front arc A _L 2 opposite to the first movable contact 21a is further driven forward on the upper surface of the lowermost grid to reach the front end. A first front arc A _L 2 between the front end of the lowermost grid and the first movable contact 21 a is extended on the left side on the side surface of the movable holder 4. The first rear lower arc A _L 1 is located between the lower end of the first arc runner 19 and the rear end face of the lowermost grid.

On the other hand, the second front arc A _R 2 shown in FIG. 16 is further extended by the action of the cooling action and gas pressure of the ablation gas ejected from the movable holder 4 in contrast to the first front arc A _L 2. To do. Further, due to the action of the gas pressure of the ablation gas, the end portion of the second front-side arc A _R 2 opposite to the second movable contact 21b is driven further forward on the upper surface of the lowermost grid. The second front arc A _R 2 is extended on the right side on the side surface of the movable holder 4. The second rear lower arc A _R 1 is located between the lower end of the second arc runner 29 and the rear end face of the lowermost grid.

Next, FIG. 17 and FIG. 18 show a state inside the blocking unit 10 when a further time elapses after the mover rotates 270 degrees counterclockwise from the position at the time of closing. The ablation gas is also ejected from a position near the first movable contact 21a on the side surface of the movable holder 4 as shown by an arrow in FIG. 17, and further drives the opposed first front arc A _L 2 upward. To do. Therefore, the first front arc A _L 2 is commutated to the uppermost grid of the first arc extinguishing chamber, and as shown in FIG. 17, the first rear upper arc A _L 4 and the first front arc Divided into A _L 3
The first rear upper arc A _L 4 is located between the lower surface of the uppermost grid and the first movable contact 21a. The first front arc A _L 2 is positioned between the upper surface of the lowermost grid and the lower surface of the uppermost grid. The first rear lower arc A _L 1 is located between the lower end of the first arc runner 19 and the rear end face of the lowermost grid.

On the other hand, the second front arc A _R 2 in the second arc extinguishing chamber 24 extends symmetrically with the first front arc A _L 2. Due to the action of the gas pressure of the ablation gas ejected from the movable holder 4, the second front arc A _R 2 is commutated to the uppermost grid of the second arc extinguishing chamber, and as shown in FIG. Is divided into a rear upper arc A _R 4 and a second front arc A _R 3. The second rear upper arc A _R 4 is located between the lower surface of the uppermost grid and the second movable contact 21b. The second front arc A _R 2 is located between the upper surface of the lowermost grid and the lower surface of the uppermost grid. The second rear lower arc A _R 1 is located between the lower end of the second arc runner 29 and the rear end face of the lowermost grid.

As shown in FIGS. 7 to 18, the two arcs A _L and A _R generated in the two arc extinguishing chambers 14 and 24 extend with the rotation of the mover 2 and finally become three. By being divided, the arc voltage is increased and the arc is extinguished.
As described above, according to the circuit breaker according to the embodiment of the present invention, the movable element 2 is exposed from the side surface of the movable holder 4 only at the end portions on the two movable contacts 21a and 21b side, and then the two movable elements. The contacts 21a and 21b are rotated away from the two fixed contacts 11a and 11b, and the two arcs A _L and _AR are extended. The two arcs A _L and A _R are controlled to be driven toward the arc extinguishing devices 15 and 25 by the cooling action and the gas pressure action of the ablation gas ejected from the movable holder 4. Further, the two arcs A _L and A _R are commutated to the lowermost grid after the ends of the fixed contacts 11a and 11b are commutated to the two arc runners 19 and 29, and then the two movable contacts 21a. , 21b is driven and controlled to follow. By controlling the extension of the two arcs A _L and A _R , the opening distance is ensured without lengthening the portion held on the side surface of the movable holder 4 of the mover 2. Therefore, even if the circuit breaker is made compact, the arc voltage can be effectively increased and a high-voltage short-circuit current can be interrupted.

  Further, according to the circuit breaker according to the embodiment of the present invention, the two movable contacts 21a and 21b are rotated and separated from each other so as to draw a locus of a perfect circle from the contact position with the two fixed contacts 11a and 11b. Here, the spatial distance and creepage distance between the two movable contacts 21a and 21b and the two fixed contacts 11a and 11b both increase until the rotation range of the movable element 2 reaches 180 degrees, and the spatial distance is 180 degrees. Is the largest. However, when the mover 2 rotates over 180 degrees, the creepage distance continues to increase, but the spatial distance starts to decrease. In the embodiment of the present invention, since the movable element 2 rotates 270 degrees, the creeping distance between the two movable contacts 21a and 21b and the two fixed contacts 11a and 11b is increased while the spatial distance is longer than a certain length. Do not enlarge. Therefore, it is possible to efficiently acquire the creepage distance with respect to the spatial distance.

Further, according to the circuit breaker according to the embodiment of the present invention, the end of the mover 2 is branched into the two tips 22a and 22b with the partition wall 31 therebetween, and two adjacent arc extinguishing with the partition wall 31 in between. Arranged so as to face the chambers 14 and 24, the two arcs A _L and A _R are extinguished separately. That is, the space between the left and right sides of the partition wall 31 of the main body frame 30 is effectively utilized, and so-called two-point cutting is performed in a compact manner. For this reason, arcs can be generated in series at a plurality of points, and the respective arcs can be divided, and a large arc voltage can be generated without increasing the size of the circuit breaker.

  In addition, since the arc is driven using the gas pressure of the ablation gas, even an arc in a small current region having a weak self-driving force can be commutated and cut off, and contact consumption can be suppressed. Further, since the arc is driven using the gas pressure, the short-circuit current can be interrupted regardless of the direction of the arc current, and the direct current as well as the alternating current can be interrupted. Further, since the arc is driven using the gas pressure of the ablation gas, it is not necessary to configure an external magnetic field for magnetically driving the arc, and there is no need to provide a magnetic source such as a permanent magnet.

Although the present invention has been described by the embodiments disclosed above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, it should be understood that various alternative embodiments, examples, and operational techniques will become apparent to those skilled in the art.
For example, in the circuit breaker according to the embodiment of the present invention, the two arcs A _L and A _R generated between the two fixed contacts 11a and 11b and the two movable contacts 21a and 21b are extinguished. However, the circuit breaker may be a circuit breaker having a set of fixed contacts and movable contacts. Further, an arc may be generated in series at a plurality of points other than two points. The present invention may be configured to suppress the region of the mover exposed on the side surface of the movable holder and rotate the mover to extend the generated arc on the side surface of the movable holder.
That is, the present invention includes various embodiments and the like not described above, and the technical scope of the present invention is determined only by the invention specifying matters according to the appropriate claims from the above description. is there.

1a 1st stator 1b 2nd stator 2 mover 4 movable holder 5 shaft 11a first fixed contact 11b second fixed contact 14 first arc extinguishing chamber 15 first arc extinguishing device 19 first Arc runner 21a First movable contact 21b Second movable contact 22a First tip 22b Second tip 24 Second arc extinguishing chamber 25 Second arc extinguishing device 29 Second arc runner _AL First arc a _R second of arc

Claims (9)

A movable holder whose surface is made of an insulator and is rotatably supported;
A stator having fixed contacts;
A movable element that has a movable contact that contacts and separates from the fixed contact, is attached to the movable holder so that an end provided with the movable contact is exposed on a side surface of the movable holder, and rotates together with the movable holder; ,
An arc extinguishing device for extinguishing an arc generated between the stator and the mover;
With
The circuit breaker according to claim 1, wherein an upper limit angle of a rotation range of the mover is 180 degrees or more.   The circuit breaker according to claim 1, wherein the insulator includes a resin that generates ablation gas by heating.   The circuit breaker according to claim 1 or 2, further comprising an arc runner having one end portion close to the fixed contact and the other end portion close to the arc extinguishing device. The movable contact includes a first movable contact and a second movable contact;
The exposed end of the mover is branched into a first tip and a second tip,
The stator has a first fixed contact with respect to the first movable contact, and a second fixed contact with respect to the second movable contact,
The first movable contact is provided at the first tip and the second movable contact is provided at the second tip;
The arc extinguishing device is generated from the first arc extinguishing device for extinguishing an arc generated from the first movable contact and the first fixed contact, and from the second movable contact and the second fixed contact. The circuit breaker according to any one of claims 1 to 3, further comprising a second arc extinguishing device that extinguishes the arc to be performed. A first arc runner having one end proximate to the first fixed contact and the other end proximate to the first arc-extinguishing device;
A second arc runner having one end proximate to the second fixed contact and the other end proximate to the second arc extinguishing device;
The circuit breaker according to claim 4, further comprising: A movable holder whose surface is made of an insulator and is rotatably supported;
A stator having fixed contacts;
A movable element that has a movable contact that contacts and separates from the fixed contact, is attached to the movable holder so that an end provided with the movable contact is exposed on a side surface of the movable holder, and rotates together with the movable holder; ,
An arc extinguishing device for extinguishing an arc generated between the stator and the mover;
With
The circuit breaker, wherein the insulator includes a resin that generates ablation gas by heating.   The circuit breaker according to claim 6, further comprising an arc runner in which one end is close to the fixed contact and the other end is close to the arc extinguishing device. The movable contact includes a first movable contact and a second movable contact;
The exposed end of the mover is branched into a first tip and a second tip,
The stator has a first fixed contact with respect to the first movable contact, and a second fixed contact with respect to the second movable contact,
The first movable contact is provided at the first tip and the second movable contact is provided at the second tip;
The arc extinguishing device is generated from the first arc extinguishing device for extinguishing an arc generated from the first movable contact and the first fixed contact, and from the second movable contact and the second fixed contact. The circuit breaker according to claim 6, further comprising a second arc extinguishing device that extinguishes the arc to be generated. A movable holder whose surface is made of an insulator and is rotatably supported;
A stator having fixed contacts;
A movable element that has a movable contact that contacts and separates from the fixed contact, is attached to the movable holder so that an end provided with the movable contact is exposed on a side surface of the movable holder, and rotates together with the movable holder; ,
An arc extinguishing device for extinguishing an arc generated between the stator and the mover;
With
The movable contact includes a first movable contact and a second movable contact;
The exposed end of the mover is branched into a first tip and a second tip,
The stator has a first fixed contact with respect to the first movable contact, and a second fixed contact with respect to the second movable contact,
The first movable contact is provided at the first tip and the second movable contact is provided at the second tip;
The arc extinguishing device is generated from the first arc extinguishing device for extinguishing an arc generated from the first movable contact and the first fixed contact, and from the second movable contact and the second fixed contact. A second arc extinguishing device for extinguishing the arc to be
  A first arc runner having one end proximate to the first fixed contact and the other end proximate to the first arc-extinguishing device;
A second arc runner having one end proximate to the second fixed contact and the other end proximate to the second arc extinguishing device;
A circuit breaker further comprising:

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