Circuit breaker

Abstract

In a circuit breaker, the leakage of arc gas through the through-hole of the second link constituting the toggle link during tripping is suppressed, thereby improving the tripping performance. [Solution] The second link 32 constitutes the other side of the toggle link 26 in the opening / closing mechanism 19. One end is rotatably connected to the toggle pin 33, and the other end is rotatably connected to the movable holder 18. The contact is opened and closed by rotating the movable holder 18. The partition wall 41 is provided to separate the opening / closing mechanism 19 side from the movable holder 18 side, and a through hole 42 for the second link 32 is formed therein. When viewed from the width direction, the second link 32 has an outer shape in which both the contour on the power supply side and the contour on the load side are shifted towards the power supply side at the center of the path from one end to the other. The through hole 42 is set so as to minimize the gap as possible without interfering with the operation of the second link 32.

Description

Technical Field

[0001] The present invention relates to a circuit breaker.

Background Art

[0002] In the circuit breaker described in Patent Document 1, the opening and closing of contacts are performed by rotating a movable holder by a second link of a toggle link. A through hole of the second link is formed in a partition wall that separates the opening / closing mechanism side and the contact side. In order to prevent arc gas from escaping to the opening / closing mechanism side through the gap of the through hole when off, a protrusion is formed on the second link to reduce the gap of the through hole.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a configuration in which a protrusion is formed on the second link of the toggle link, the gap when off can be reduced, but there is room for improvement in reducing the gap when tripping. If arc gas escapes through the gap of the through hole, the driving force of the arc decreases, which affects the interruption performance. An object of the present invention is to suppress the escape of arc gas through a through hole of a second link constituting a toggle link during tripping in a circuit breaker and to improve the interruption performance.

Means for Solving the Problems

[0005] A circuit breaker according to one aspect of the present invention comprises a second link and a partition wall. The second link constitutes the other half of a toggle link in the switching mechanism, with one end rotatably connected to a toggle pin and the other end rotatably connected to a movable holder, and the contacts are opened and closed by rotating the movable holder. The partition wall is provided to separate the switching mechanism side from the movable holder side, and a through hole for the second link is formed therein. The direction in which the toggle pin extends is defined as the width direction. When viewed from the width direction, the second link has an outer shape in which both the power supply side contour and the load side contour are shifted toward the power supply side at the center of the path from one end to the other. The through hole is set so as to minimize the gap as possible without interfering with the operation of the second link.

[0006] A circuit breaker according to another aspect of the present invention comprises a second link and a partition wall. The second link constitutes the other half of a toggle link in the opening / closing mechanism, with one end rotatably connected to a toggle pin and the other end rotatably connected to a movable holder, and the contacts are opened and closed by rotating the movable holder. The partition wall is provided to separate the opening / closing mechanism side from the movable holder side, and a through hole for the second link is formed therein. The direction in which the toggle pin extends is defined as the width direction. The second link has an outer shape in which the center of the path from one end to the other, viewed from the width direction, is bent in a V-shape so as to be convex toward the power supply side. The through hole is set so as to minimize the gap as possible without interfering with the operation of the second link. [Effects of the Invention]

[0007] According to the present invention, the gap in the through-hole can be minimized by the second link. Therefore, it is possible to suppress the leakage of arc gas from the through-hole during tripping and improve the shutoff performance. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram showing a circuit breaker. [Figure 2] This is a diagram showing a cross-section of a circuit breaker. [Figure 3] This is a diagram showing the case. [Figure 4]This is a diagram showing the second link. [Figure 5] This figure shows the movable holder and the second link. [Figure 6] This figure shows the case and the movable holder. [Figure 7] This is a diagram showing the bulkhead of the middle cover. [Figure 8] This diagram shows the middle cover and the second link. [Figure 9] This diagram shows the second link when it is enabled. [Figure 10] This diagram shows the second link when it is off. [Figure 11] This figure shows the second link during the trip. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. Note that the drawings are schematic and may differ from actual examples. Furthermore, the following embodiments are illustrative examples of devices and methods for realizing the technical concept of the present invention, and do not limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0010] 《Embodiment》 "composition" In the following explanation, the three mutually orthogonal directions will be referred to as the vertical direction, the width direction, and the depth direction for convenience. Figure 1 shows a circuit breaker 11. Here, the circuit breaker 11 is shown as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. The circuit breaker 11, also called a no-fuse breaker, automatically shuts off the circuit to protect against damage caused by overcurrent when it detects an abnormal overcurrent due to overload or short circuit. One side in the vertical direction is the power supply side, and the other side is the load side. The circuit breaker 11 has a resin housing consisting of a case 12, a middle cover 13, and a top cover 14. The case 12 is located at the back in the depth direction, the middle cover 13 is fitted into the case 12 on the power supply side, and the top cover 14 is fitted into the case 12 and middle cover 13 on the load side (Figure 2).

[0011] Figure 2 shows a cross-section of the circuit breaker 11. Here, the circuit breaker 11 is shown with its cross-section viewed from one side in the width direction, passing through the second pole, which is located in the center of the width direction among the three poles arranged in the width direction, along the vertical and depth directions. The circuit breaker 11 comprises a fixed contact 16, a movable contact 17, a movable holder 18, and an opening / closing mechanism 19. The fixed contact 16 is a strip-shaped conductor fixed to the power supply side of the case 12, and a fixed contact 21 is formed on the surface facing forward in the depth direction.

[0012] The movable contact 17 is a rod-shaped conductor held by the movable holder 18 and is rotatably supported between a closed position and an open position. When viewed from one side in the width direction, counterclockwise is the closed direction and clockwise is the open direction. The movable contact 17 has a movable contact 22 formed on the tip side of the surface facing the closed direction. The movable contact 17 is in a closed ON state when the movable contact 22 contacts the fixed contact 21, and is in an open OFF state when the movable contact 22 separates from the fixed contact 21. The movable holder 18 is rotatably held by the case 12 and the middle cover 13, and rotates the movable contact 17 in conjunction with the opening / closing mechanism 19. The movable holder 18 rotates the movable contact 17 to the closed position when the opening / closing mechanism 19 is in the ON state, and rotates the movable contact 17 to the open position when it is in the OFF state or trip state.

[0013] The opening and closing mechanism 19 includes a toggle link 26 and a latch 27. The toggle link 26 includes a first link 31 and a second link 32. The other end of the first link 31 and one end of the second link 32 are rotatably connected via a toggle pin 33. One end of the first link 31 is rotatably fitted into the boss of the latch 27. The other end of the second link 32 is rotatably connected to the movable holder 18 via a connecting pin 34. The latch 27 is rotatably supported by a latch pin 36. The latch 27 is latched when on and off, fixing one end of the first link 31, and becomes a released state when tripped, displacing one end of the first link 31 by rotation.

[0014] When the handle 37 is turned on, the toggle link 26 extends against the elastic force of the tension coil spring 38 to rotate the movable holder 18 to the closed pole position. When the handle 37 is turned off, the toggle link 26 bends to rotate the movable holder 18 to the open pole position. When the opening and closing mechanism 19 trips due to overcurrent or short-circuit current, the latch 27 is released, causing the toggle link 26 to bend by the elastic force of the tension coil spring 38 and rotate the movable holder 18 to the open pole position. The middle cover 13 includes a partition wall 41. The partition wall 41 is a wall body along the vertical and width directions, and is provided so as to separate the opening and closing mechanism 19 side and the movable holder 18 side. A through hole 42 for the second link 32 is formed in the partition wall 41.

[0015] <000​​Figure (a) shows the portion of case 12 that houses the movable holder 18 of the second pole, which is located in the center in the width direction, as viewed from the other side in the vertical direction, one side in the width direction, and the front in the depth direction. Figure (b) shows the portion of case 12 that houses the movable holder 18 of the second pole, which is located in the center in the width direction, as viewed from the front in the depth direction. Case 12 is equipped with a partition wall 46. The partition wall 46 is a wall body that runs along the width direction and the depth direction, and faces the power supply side of the movable holder 18 of the second pole. The partition wall 46 has an opening 47 and a groove 48 formed therein. The opening 47 is a notch that connects the partition wall 46 in the vertical direction and is concave from the front to the back in the depth direction. The movable contact 17 is positioned in the opening 47. The groove 48 is formed on both sides of the opening 47 in the width direction on the other side of the partition wall 46 that faces the other side in the vertical direction, and extends from the front to the back in the depth direction.

[0016] Figure 4 shows the second link 32. Figure (a) shows the second link 32 as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. Figure (b) shows the second link 32 as viewed from one side in the width direction. The second link 32 is a flat metal plate oriented in the vertical and depth directions, and comprises one piece 51 and the other piece 52. One end of piece 51 has a circular hole that penetrates in the width direction, serving as connection point P1 with the other end of the first link 31. The other end of piece 52 has a circular hole that penetrates in the width direction, serving as connection point P2 with the movable holder 18. When viewed from the width direction, the second link 32 has an external shape in which both the power supply side contour and the load side contour are shifted toward the power supply side at the center of the path from one end to the other. In other words, when viewed from the width direction, the second link 32 has an external shape in which the center of the path from one end to the other is bent in a V-shape so as to be convex toward the power supply side. In other words, the axis L1 on which one piece 51 extends and the axis L2 on which the other piece 52 extends are non-parallel, and the angle θ between axis L1 and axis L2 is obtuse here. The connection point P1 is offset from axis L1 towards the power source. The connection point P2 is on axis L2.

[0017] Figure 5 shows the movable holder 18 and the second link 32. Here, the movable holder 18 to which the second link 32 is assembled is shown as viewed from one side in the vertical direction, one side in the width direction, and the front in the depth direction. The movable holder 18 is formed in a substantially cylindrical shape with an opening on the back side in the depth direction and the load side in the vertical direction for each pole, and three poles are integrated. The movable holder 18 of the second pole, located in the center in the width direction, has a pair of support holes 56 formed on the cylindrical surface facing the power supply side in the vertical direction and the front in the depth direction. The support holes 56 are provided on both sides that sandwich the movable contact 17 in the width direction, and are concave radially inward from the cylindrical surface, forming a substantially fan shape when viewed from the width direction (Figure 9). The second link 32 is inserted into the support holes 56 and is rotatably supported by connecting pins 34. The connecting pins 34 are inserted from both end faces in the width direction of the movable holder 18.

[0018] Figure 6 shows the case 12 and the movable holder 18. Here, the case 12, to which the movable holder 18 is assembled, is shown as viewed from the other side in the vertical direction, one side in the width direction, and from the front in the depth direction. The partition wall 46 of the case 12 avoids interference with the second link 32 by the groove 48. Figure 7 shows the partition wall 41 of the middle cover 13. Figure (a) shows the partition wall 41 of the middle cover 13 as viewed from the other side in the vertical direction, one side in the width direction, and the front in the depth direction. Figure (b) shows the partition wall 41 of the middle cover 13 as viewed from one side in the width direction, with a cross section along the vertical and depth directions passing through the through-hole 42. The through-hole 42 is a narrow rectangular elongated hole with a cross-sectional shape extending in the vertical direction, and as viewed from the width direction, it penetrates the partition wall 41 diagonally along an axis L3 that extends towards one side in the vertical direction as it goes further into the depth direction. The second link 32 is inserted through the through-hole 42. The through-hole 42 is set so that the gap is minimized as much as possible without interfering with the operation of the second link 32.

[0019] Figure 8 shows the middle cover 13 and the second link 32. Here, the middle cover 13 assembled to the case 12 is shown as viewed from the other side in the vertical direction, one side in the width direction, and the front in the depth direction. Only one end of the second link 32 (one piece 51) protrudes from the partition wall 41. Figure 9 shows the second link 32 when it is ON. Here, the circuit breaker 11 is shown with its cross section, viewed from one side in the width direction, passing through the through-hole 42 and along the vertical and depth directions. When in the ON state, the second link 32 is at the back in the depth direction, and only one side 51 passes through the through-hole 42. At this time, when viewed from the width direction, the axis L1 of the side 51 and the direction in which the through-hole 42 passes are approximately parallel.

[0020] Figure 10 shows the second link 32 when it is off. Here, the circuit breaker 11 is shown with its cross section, viewed from one side in the width direction, passing through the through-hole 42 and along the vertical and depth directions. When in the off state, the second link 32 is in the front in the depth direction, and only the other piece 52 passes through the through-hole 42. At this time, the axis L2 of the other piece 52, when viewed from the width direction, is approximately parallel to the depth direction. Because the other piece 52 is closer to the load side of the through-hole 42, there is almost no gap on the load side. The latch pin 36 is located on the opening / closing mechanism 19 side of the through-hole 42 and on the power supply side of the second link 32, and by crossing the opening of the through-hole 42, it seals the gap on the power supply side.

[0021] Figure 11 shows the second link 32 during tripping. Here, the circuit breaker 11 is shown with its cross section along the vertical and depth directions, passing through the through-hole 42, as viewed from one side in the width direction. When tripped, the second link 32 is in the front in the depth direction, and only the other piece 52 passes through the through-hole 42. At this time, when viewed from the width direction, the axis L2 of the other piece 52 and the direction of penetration of the through-hole 42 intersect at an angle of approximately 90 degrees. As a result, when viewed from the width direction, one end of the other piece 52 is closer to the power supply side of the through-hole 42, so there is almost no gap on the power supply side. Also, when viewed from the width direction, the other end of the other piece 52 is closer to the load side of the through-hole 42, so there is almost no gap on the load side either. Arc gas is discharged from an exhaust port on the power supply side (not shown), and this arc gas flow also promotes the drive towards the arc extinguishing grid side in the arc, as shown by the thick solid line. Therefore, by suppressing the outflow of arc gas from the through-hole 42 to the opening / closing mechanism 19, most of the arc gas is guided to the exhaust port on the power supply side, increasing the driving force of the arc.

[0022] Effects and Benefits Next, the main effects and advantages of the embodiment will be described. The circuit breaker 11 comprises a second link 32 and a partition wall 41. The second link 32 constitutes the other half of the toggle link 26 in the switching mechanism 19, with one end rotatably connected to a toggle pin 33 and the other end rotatably connected to a movable holder 18, and the contacts are opened and closed by rotating the movable holder 18. The partition wall 41 is provided to separate the switching mechanism 19 side from the movable holder 18 side, and a through hole 42 for the second link 32 is formed therein. The direction in which the toggle pin 33 extends is defined as the width direction. When viewed from the width direction, the second link 32 has an outer shape in which both the power supply side contour and the load side contour are shifted toward the power supply side at the center of the path from one end to the other. The through hole 42 is set so as to minimize the gap as possible without interfering with the operation of the second link 32. This allows the gap in the through hole 42 to be minimized by the second link 32. Therefore, it is possible to suppress the leakage of arc gas from the through-hole 42 during tripping and improve the shutoff performance.

[0023] The circuit breaker 11 comprises a second link 32 and a partition wall 41. The second link 32 constitutes the other half of the toggle link 26 in the opening / closing mechanism 19, with one end rotatably connected to a toggle pin 33 and the other end rotatably connected to a movable holder 18, and the contacts are opened and closed by rotating the movable holder 18. The partition wall 41 is provided to separate the opening / closing mechanism 19 side from the movable holder 18 side, and a through hole 42 for the second link 32 is formed therein. The direction in which the toggle pin 33 extends is defined as the width direction. The second link 32 has an outer shape that is bent in a V-shape so that the center of the path from one end to the other end, when viewed from the width direction, is convex toward the power supply side. The through hole 42 is set so that the gap is minimized within the range that does not interfere with the operation of the second link 32. In this way, the gap of the through hole 42 can be minimized by the second link 32. Therefore, it is possible to suppress the leakage of arc gas from the through-hole 42 during tripping and improve the shutoff performance.

[0024] The external shape of the second link 32 is the external shape as viewed from the width direction when it is ON and when it is tripped. This allows the gap in the through hole 42 to be minimized by the second link 32. The vertical direction is defined as the direction in which, when viewed from the width direction, one end is the power supply side and the other is the load side. When the second link 32 is off, the outer shape of the other end when viewed from the width direction extends in a direction perpendicular to the vertical direction. This minimizes the gap on the load side. The circuit breaker 11 is equipped with a partition wall 46. The partition wall 46 faces the second link 32 on the power supply side of the movable holder 18. The partition wall 46 has a groove 48 formed therein to avoid interference with the second link 32. This enables smooth operation of the second link 32. The opening / closing mechanism 19 is equipped with a latch pin 36. The latch pin 36 extends in the width direction as the pivot axis of the latch 27. The latch pin 36 is positioned on the opening / closing mechanism 19 side of the through hole 42 and on the power supply side of the second link 32 so as to close the gap. This minimizes the gap on the power supply side when the device is turned off.

[0025] Although the above description has been made with reference to a limited number of embodiments, the scope of the rights is not limited to those embodiments, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of Symbols]

[0026] 11...Circuit breaker, 12...Case, 13...Middle cover, 14...Top cover, 16...Fixed contact, 17...Movable contact, 18...Movable holder, 19...Opening / closing mechanism, 21...Fixed contact, 22...Movable contact, 26...Toggle link, 27...Latch, 31...First link, 32...Second link, 33...Toggle pin, 34...Connecting pin, 36...Latch pin, 37...Handle, 38...Tension coil spring, 41...Bulkhead, 42...Through hole, 46...Partition wall, 47...Opening, 48...Groove, 51...One piece, 52...Other piece, 56...Support hole

Claims

1. A second link, which constitutes the other side of the toggle link in the opening / closing mechanism, has one end rotatably connected to a toggle pin and the other end rotatably connected to a movable holder, and opens and closes the contact by rotating the movable holder, The device comprises a partition wall provided to separate the opening / closing mechanism side from the movable holder side, and having a through hole for the second link formed therein. The direction in which the toggle pin extends is defined as the width direction. The second link, when viewed from the width direction, has an outer shape in which both the power supply side contour and the load side contour are shifted toward the power supply side at the center of the path from one end to the other. The circuit breaker is characterized in that the through-hole is set so as to minimize the gap without interfering with the operation of the second link.

2. A second link, which constitutes the other side of the toggle link in the opening / closing mechanism, has one end rotatably connected to a toggle pin and the other end rotatably connected to a movable holder, and opens and closes the contact by rotating the movable holder, The device comprises a partition wall provided to separate the opening / closing mechanism side from the movable holder side, and having a through hole for the second link formed therein. The direction in which the toggle pin extends is defined as the width direction. The second link has an outer shape that is bent in a V-shape so that the center of the path from one end to the other, when viewed from the width direction, is convex toward the power supply side. The circuit breaker is characterized in that the through-hole is set so as to minimize the gap without interfering with the operation of the second link.

3. The circuit breaker according to claim 1 or 2, characterized in that the external shape of the second link is the external shape as viewed from the width direction when it is ON and when it is tripped.

4. When viewed from the width direction, the direction in which one side is the power supply side and the other side is the load side is defined as the vertical direction. The circuit breaker according to claim 1 or 2, characterized in that the outer shape of the other end of the second link, when viewed from the width direction when it is off, extends in a direction perpendicular to the vertical direction.

5. The movable holder is provided with a partition wall on the power supply side facing the second link, The circuit breaker according to claim 1 or 2, characterized in that a groove is formed in the partition wall to avoid interference with the second link.

6. The opening and closing mechanism includes a latch pin that extends in the width direction as the pivot axis of the latch, The circuit breaker according to claim 1 or 2, characterized in that the latch pin is positioned on the opening / closing mechanism side of the through hole and on the power supply side of the second link so as to close the gap.

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