WO2007010608A1

WO2007010608A1 - Breaker

Info

Publication number: WO2007010608A1
Application number: PCT/JP2005/013396
Authority: WO
Inventors: Yo Makita; Toshie Takeuchi; Kazunori Fukuya
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2005-07-21
Filing date: 2005-07-21
Publication date: 2007-01-25
Also published as: DE112005003632T5; CN101223619A; CN101223619B; KR20080026613A; DE112005003632B4; KR100967249B1

Abstract

A breaker having a shaft (9), an operation arm (7), and an electromagnetic operation means (10). The shaft (9) is provided pivotable about an axis (91). The operation arm (7) is pivotally connected by a first connection section to the shaft (9) with a first predetermined distance ra vertically away from the axis (91) and is connected to a movable member by a second connection section. The electromagnetic operation means (10) has a drive shaft (16) that is connected to the shaft (9) by a third connection section provided at a circumferentially different position of the shaft (9) from the first connection section and is driven so as to move on a straight line perpendicularly crossing the axis (91) with a second predetermined distance rb from the axis (91). The electromagnetic operation means (10) is urged to drive a drive shaft (16), which rotates the shaft (9) to drive the movable member via the operation arm (7). An operation mechanism section is simplified and downsized, and controllability and reliability of the breaker are improved.

Description

Specification

Breaker

Technical field

[0001] The present invention relates to a circuit breaker having a fixed contact and a movable contact, and having an electromagnetic operation mechanism for inserting or removing the movable contact with respect to the fixed contact.

Background art

[0002] Conventional low-voltage circuit breakers have been mainly spring-operated circuit breakers that use the energy released when the stored spring is released to perform the opening or releasing operation of the movable contact. . (For example, see Patent Document 1)

On the other hand, a circuit breaker has appeared that allows the movable contact of the vacuum switch to be turned on or off using an electromagnetic operating mechanism. (For example, see Patent Document 2)

Patent Document 1: Japanese Patent Application Laid-Open No. 6-89650 (Figures 1-5, page 2)

Patent Document 2: EP1214727B1 (Fig. L to Fig. 2, pages 2 to 5)

Disclosure of the invention

Problems to be solved by the invention

[0003] The low-voltage circuit breaker disclosed in Patent Document 1 uses a large number of latches and links in the operation mechanism, leading to an increase in the size of the device and a large number of parts to compensate for device reliability. Therefore, maintenance at regular intervals was necessary.

[0004] In addition, the circuit breaker disclosed in Patent Document 2 has a long link provided between the operating shaft that performs the insertion or tripping operation of the movable contact and the fixed contact and the drive shaft of the electromagnetic operation mechanism, and is still As a result, improvements are needed to improve the reliability and miniaturization of equipment. In addition, the circuit breaker disclosed in Patent Document 2 has a U-shaped circuit to achieve short-term energization performance of the contact part !, but the shape and dimensions of the U-shaped circuit depend on the current capacity. It is necessary to change each. The short-time energization performance mentioned here is one of the performances required when using the circuit breaker as a main circuit breaker. The protection relay device operates when a large current is energized, such as a short-circuit accident, so that the safe circuit-breaking operation can be performed. This is the ability to keep the short-circuit current flowing until the operation is performed. Generally, when a large current is applied, a large electromagnetic repulsive force is generated between the contacts, and the movable contact Since a point may float, a structure is required that does not cause the floating contact like the U-shaped electric circuit shown in Patent Document 2 to rise.

[0005] The present invention has been made in order to solve the problems in such a conventional circuit breaker, and is intended to simplify and reduce the size of the operation mechanism and to improve controllability and reliability. The purpose is to obtain a closed circuit breaker.

Means for solving the problem

[0006] A circuit breaker according to the present invention includes a fixed conductor having a fixed contact, a mover having a movable contact, and being driven to put the movable contact into or out of the fixed contact, and an axis. A shaft that is pivotally provided as a center, and is pivotally connected to the shaft by a first connecting portion at a first predetermined distance in a direction perpendicular to the axis, and is movable. The operating arm connected to the child by the second connecting portion and the shaft connected to the shaft by the third connecting portion provided at a position different from the first connecting portion in the circumferential direction of the shaft. An electromagnetic operating means having a drive shaft driven so as to move on a straight line orthogonal to the core at a second predetermined distance, and energizing the electromagnetic operating means to drive the drive shaft To rotate the shaft through the operating arm. Is obtained so as to drive the movable element Te.

In the present invention, the first connecting portion that connects the shaft and the operating arm is a connecting portion that directly connects the shaft and the operating arm, and the shaft is connected to the shaft via another member. It includes both cases where it is a connecting portion that indirectly connects the operation arm. In the present invention, the second connecting portion that connects the operating arm and the mover may be a connecting portion that directly connects the operating arm and the mover, and the other connection member through the other member. Both are included in the case where the operating arm and the movable element are indirectly connected to each other.

Furthermore, in the present invention, the third connecting portion that connects the shaft and the drive shaft is a connecting portion that directly connects the shaft and the drive shaft, and the shaft is connected via another member. In the case of a connecting portion that indirectly connects the shaft and the drive shaft.

The invention's effect

[0007] According to the circuit breaker according to the present invention, the first predetermined distance is provided in the direction perpendicular to the axis. An operating arm that is pivotally connected to the shaft by the first connecting portion and is connected to the mover by the second connecting portion, and a position in the circumferential direction of the shaft that is different from the first connecting portion. An electromagnetic operating means having a drive shaft connected to the shaft by a third connecting portion provided on the shaft and driven to move on a straight line perpendicular to the axis at a second predetermined distance. Since the electromagnetic operation means is energized to drive the drive shaft, the shaft is rotated to drive the movable element via the operation arm. In addition to being able to reduce the size, the controllability and reliability of the circuit breaker can be improved.

BEST MODE FOR CARRYING OUT THE INVENTION

[0008] Embodiment 1

FIG. 1 is a configuration diagram showing a circuit breaker according to Embodiment 1 of the present invention, and FIGS. 2 and 3 are explanatory diagrams for explaining the operation of the circuit breaker according to Embodiment 1. FIG.

In FIG. 1, the insulating housing 1 has space portions 101 and 102 partitioned by an insulating wall 103 inside, and includes a pair of fixed conductors 21 and 22 that penetrate the space portion 101 from the outside. The fixed conductors 21 and 22 are connected to a power supply side conductor and a load side conductor (not shown), respectively. The fixed conductor 21 and the fixed conductor 22 are also referred to as a power supply side terminal and a load side terminal, respectively. A fixed contact 211 is fixed to the end of the fixed conductor 21 exposed in the space 101 of the insulating casing 1.

The movable element 3 is rotatably supported by the link pin 4, and the movable contact 311 is fixed at a position facing the fixed contact 211. The contact pressure spring 5 urges the movable element 3 to rotate clockwise about the link pin 4 so that contact pressure is applied between the two contacts when the movable contact 311 is inserted into the fixed contact 211. To do. The movable element 3 and the fixed conductor 22 are electrically connected by a flexible conductor 6 that can be sandwiched.

A plate-like connecting plate 8 provided in the space 102 of the insulating housing 1 is fixed to a shaft 9 supported so as to be rotatable around an axis 91. The connecting plate 8 includes a long groove-like connecting hole 81 inclined inward from the outer periphery thereof. The operating arm 7 passes through a through-hole 104 provided in the cutting wall 103 of the insulating housing 1, one end of which is rotatably connected to the movable element 3, and the other end is connected to the connecting plate 8 by a connecting pin 71. It is pivotally connected. Connecting pin 71 The connecting portion between the connecting plate 8 and the other end of the operating arm 7 constitutes a first connecting portion, and this first connecting portion has a radius r that is a first predetermined distance from the axis 91 of the shaft 9. It is provided at the position. In the case of FIG. 1, since the shaft center 91 and the connecting pin 71 overlap on the y-axis, the distance m in the y-axis direction of the first connecting portion with respect to the shaft center 91 is equal to the radius r. The distance ra in the y-axis direction decreases depending on the rotation angle of the connecting plate 8 and the shaft 9. A connecting portion between one end of the operation arm 7 and the mover 3 constitutes a second connecting portion.

[0011] An electromagnetic operation mechanism 10 as an electromagnetic operation means is provided in a space 102 of an insulating casing 1, and includes a yoke 11 formed of a magnetic material, and a first coil fixed inside the yoke 11. 12 and the second coil 13, a permanent magnet 14 fixed between the first coil 12 and the second coil 13, and the first coil 12, the second coil 13 and the permanent magnet 14 inside. The movable iron core 15 that can move in the y-axis direction in FIG. 1 and the drive shaft 16 that is fixed to the movable iron core 15 and reciprocates on a straight line in the y-axis direction as the movable iron core 15 moves. Prepare and speak.

[0012] The electromagnetic operation mechanism 10 needs to maintain a state in which the movable contact 311 is turned on and off, and has a bistable structure. In FIG. 1, the movable iron core 15 is attracted to the upper part of the yoke 11 in FIG. 1 by the magnetic force of the permanent magnet 15, and when the coil 13 is energized, the action of the magnetic flux generated by the coil 13 The movable iron core 15 is driven downward in FIG. 1 and contacts the lower part of the yoke 11. At this time, the coil 13 is deenergized. Due to the magnetic force of the permanent magnet 14, the movable iron core 15 is stabilized while being adsorbed below the yoke 11. Next, when the coil 12 is energized in this state, the movable iron core 15 is driven upward in FIG. 1 by the magnetic force of the coil 12 and is attracted to the upper portion of the yoke 11 as shown in FIG. At this time, the coil 13 is deenergized, but is stabilized while being attracted to the lower side of the yoke 11 by the magnetic force of the permanent magnet 14.

The drive shaft 16 is connected to the connection plate 8 by a connection pin 161 that fits into the connection hole 81 of the connection plate 8. The connecting portion by the connecting pin 161 and the connecting hole 81 constitutes a third connecting portion. The drive shaft 16 moves on a straight line in the y-axis direction that is perpendicular to the shaft center 91 via a distance rb. This distance rb corresponds to the second predetermined distance. The connecting plate 8 rotates around the axis 91 together with the shaft 9. However, since the connecting hole 81 is formed so as to be inclined inward from the outer periphery of the connecting plate 8, the connecting plate 8 rotates. Even so, the connecting pin 161 is fitted in the connecting hole 81 while the distance rb in the X-axis direction between the connecting pin 161 is always kept constant. [0014] FIG. 1 shows a state in which the movable contact 311 is removed from the fixed contact 211. In this state, when the coil 13 of the electromagnetic operating mechanism 10 is energized, the movable core 15 of FIG. The drive shaft 16 driven downward and fixed to the movable iron core 15 moves downward on the y-axis. As the drive shaft 16 moves downward on the y-axis, the connecting plate 8 connected to the drive shaft 16 is driven through the third connecting portion including the connecting pin 161 and the connecting hole 81 and rotates counterclockwise. Move. When the connecting plate 8 rotates counterclockwise, the operating arm 7 connected to the connecting plate 8 by the connecting pin 71 is driven to the right on the X axis, and the mover 3 is moved to the right in FIG. Drive to.

FIG. 2 shows an initial state in which the movable contact 311 starts to contact the fixed contact 211 when the movable element 3 is driven rightward in FIG. During this closing operation, contact pressure is applied between the fixed contact 211 and the movable contact 311 by the action of the contact spring 5, and a load force Fa in the direction of the arrow is generated in the operating arm 3. On the other hand, an operating force Fb based on the attractive force acting on the movable iron core 15 is generated in the direction of the arrow on the drive shaft 16 of the electromagnetic operating mechanism 10. Therefore, the rotational moment acting on the shaft 9 that fixes the connecting plate 8 is the load moment Ma (= Fa'r _a ) that attempts to rotate the shaft 9 clockwise and the shaft 9 counterclockwise. Operation moment Mb (= Fb -rb) to rotate.

here,

Ma = Fa ^# ra

Mb = Fb -rb

In order to rotate the shaft 9 and the connecting plate 8 counterclockwise, the relationship of Mb> Ma is necessary.

[0016] When the operating moment Mb that overcomes the load moment Ma is held by the connecting plate 8, the connecting plate 8 rotates in the position force in FIG. 2 and further counterclockwise, and the movable contact 311 shown in FIG. Reach the position where loading has been completed. In the state where the insertion is completed, the axis 91 of the shaft 9 and the center of the connecting pin 71 and the center of the link pin 4 are in a straight line, and the drive shaft 16, the connecting plate 8, the shaft 9, the operating arm 7, and the movable The child 3 stops at that position, and the charging of the movable contact 311 to the fixed contact 211 is continued.

[0017] As described above, the distance ra between the axis 91 and the connecting pin 71 in the y-axis direction is the position shown in FIG. When it is maximum, it decreases depending on the rotation angle of the connecting plate 8. On the other hand, the distance rb in the X-axis direction between the connecting pin 161 and the shaft center 91 is always constant. Therefore, the load moment Ma decreases depending on the rotation angle of the connecting plate 8 with the position of FIG. 1 as a base point if the load force Fa by the contact pressure spring 5 is constant. On the other hand, the operating moment Mb changes depending only on the driving force Fb of the electromagnetic operating mechanism 10 because the distance rb is constant even when the connecting plate 8 rotates.

[0018] FIG. 4 shows the relationship between the load force Fa acting on the connecting plate 8 by the contact pressure spring 5 and the load moment Ma. In Fig. 4, the horizontal axis indicates the stroke [mm] of the operating arm 7 and the vertical axis indicates the force [N]. The load force Fa by the contact pressure spring 5 rises at the stroke tl of the operating arm 7, and thereafter, the operating arm 7 passes from the position shown in FIG. 1 to the position shown in FIG. 2 to the position where the movable contact 311 shown in FIG. Until then, the load force Fa increases linearly as shown by the solid line in FIG. On the other hand, since the connecting plate 8 and the shaft 9 rotate in response to the operation arm 7 moving from the position shown in FIG. 1 to the position shown in FIG. 3, the axis 91 and the connecting pin 71 are in the y-axis direction as described above. The distance ra decreases depending on the rotation angle of the connecting plate 8 and the shaft 9. As a result, the load moment Ma acting on the connecting plate 8 and the shaft 9 changes as shown by the broken line in FIG. 4, and is almost the minimum at the completion position of the movable contact 311 in FIG. The stroke of the operating arm 7 at this closing completion position is indicated by t2 in FIG.

[0019] In order to insert the movable contact 311 into the fixed contact 211 and maintain the closing completion state shown in FIG. 3, it is necessary to continuously cover the operation moment Mb of the load moment Ma or higher on the connecting plate 8. As described above, since the load moment Ma decreases depending on the rotation angle of the connecting plate 8 and becomes the minimum when the loading is completed, the operating moment Mb for maintaining the loading completion should be equal to or greater than the minimum load moment Ma. The charging completion state can be maintained by the attractive force of the movable iron core 15 by the permanent magnet 14 of the relatively small electromagnetic operating mechanism 10.

[0020] Next, an operation in the case where the closing completion state force movable contact 311 shown in Fig. 3 is tripped will be described. 3, the movable iron core 15 of the electromagnetic operating mechanism 10 is adsorbed to the position opposite to the position shown in FIG. 1, that is, the lower side of the yoke 11 in FIG. If the coil 12 is energized at this time, the movable iron core 15 is attracted upward in FIG. 1 by the action of the magnetic flux generated by the coil 12, and an operating force Fb in the direction opposite to the direction shown in FIG. To occur. Due to the operating moment Mb (= Fb 'rb) based on this operating force Fb, the connecting plate 8 It begins to rotate clockwise around the axis 91.

[0021] In the loading completion state shown in FIG. 3, the axial center 91, the connecting pin 71 and the link pin 4 are aligned with each other on a straight line and are stationary. The operating arm 7 is broken and moves from the stroke t2 in FIG. 4 to the stroke tl. At this time, the distance ra in the y-axis direction between the shaft center 91 and the connecting pin 71 increases depending on the rotation angle of the connecting plate 8 that rotates in the clockwise direction. Therefore, as shown in FIG. Increases rapidly. As a result, the connecting plate 8 is suddenly rotated clockwise in response to a large load moment Ma, and the operating arm 7 pulls the movable contact 311 of the mover 3 away from the fixed contact 211, resulting in the tripped state shown in FIG. And stable.

[0022] When the external circuit [not shown] connected between the fixed conductors 21 and 22 is closed and energized when the charging is completed as shown in FIG. A large electromagnetic repulsive force due to a large current is generated between the movable contact 311 and, as shown in Fig. 3, when the injection is completed, the center 91 of the shaft 9, the center of the connecting pin 71, and the center of the link pin 4 Is located on a straight line, the load moment to turn the connecting plate 8 clockwise by the electromagnetic repulsive force is reduced, the connecting plate 8 does not turn, and the movable contact 311 is fixed. There is no separation from contact 211. Therefore, even if this circuit breaker is used as a main circuit breaker, it is possible to achieve short-time energization performance.

Thus, according to the circuit breaker according to Embodiment 1 of the present invention, a number of links are used to reduce the driving force required for the electromagnetic operation mechanism as in the conventional device, and the link ratio depends on the link ratio. The operating mechanism that does not need to reduce the load force can be simplified and reduced in size, and the controllability and reliability of the circuit breaker can be improved and maintenance-free can be achieved.

[0024] Embodiment 2

FIG. 5 is a configuration diagram of a main part of a circuit breaker according to Embodiment 2 of the present invention. In FIG. 5, the connecting link 17 is rotatably connected to the drive shaft 16 and the connecting plate 8 of the electromagnetic operating mechanism 10 by connecting pins 171 and 172, respectively. The connection between the drive shaft 16 and the connection plate 8 by the connection link 17 constitutes a third connection portion, and the third connection by the connection hole 81 and the connection pin 161 of the connection plate 8 in the first embodiment. The drive shaft 16 is connected to the connecting plate 8 while maintaining the movement of the drive shaft 16 on the straight line in the vertical direction (y-axis direction) in FIG. Is.

Other configurations are the same as those of the circuit breaker according to the first embodiment.

According to the circuit breaker according to the second embodiment, it is not necessary to provide a connection hole, and the manufacture is facilitated.

[0025] Embodiment 3

FIG. 6 is a configuration diagram of a main part of a circuit breaker according to Embodiment 3 of the present invention. In FIG. 6, the stopper pin 801 is fixed to the connecting plate 8. The pin receiver 802 engages with the stopper pin 801 to stop the connecting plate 8 when the connecting plate 8 rotates to the loading completion position (position shown in FIG. 6), and the shaft 91 and the connecting pin 8 Keep 71 and link pin 4 in a straight line.

Other configurations are the same as those in the first embodiment.

According to the circuit breaker according to the third embodiment, it is possible to prevent position displacement in the closing state due to contact wear due to long-term use, variation in assembly, etc., and obtain stable operation performance.

[0026] Embodiment 4

FIG. 7 is a configuration diagram of a main part of a circuit breaker according to Embodiment 4 of the present invention. In FIG. 7, one end of the interlocking shaft 1601 is rotatably connected to the drive shaft 16 of the electromagnetic operating mechanism 10 by a connecting pin 1611. The stopper lever 1602 has one end rotatably supported by a support pin 1613 and a substantially central portion rotatably connected to the other end of the interlocking shaft 1601 by a connecting pin 1612. A stopper pin 8011 is fixed to the other end of the stopper link 1602. As shown in FIG. 7, the stopper pin 8011 engages the notch [not shown] of the connecting plate 8 so as to drive a wedge after the closing operation of the circuit breaker is completed, The positions of the shaft 8 and the shaft 9 are maintained, and the connecting plate 8 is prevented from rotating clockwise and counterclockwise.

[0027] When the circuit breaker is tripped, a trip command is given to the electromagnetic operating mechanism 10 to drive the drive shaft 16 upward in FIG. As a result, the stopper lever 1602 connected to the drive shaft 16 via the interlocking shaft 1601 is rotated counterclockwise about the support pin 1613, and the stopper pin 8011 and the notch portion of the connecting plate 8 are The engagement is released and the connecting plate 8 is clockwise. And the tripping of the movable contact 311 is performed.

[0028] In the third embodiment, the stopper pin 801 is mainly intended to prevent the connecting plate 8 and the shaft 9 from rotating further counterclockwise beyond the insertion completion position. In this Embodiment 4, the stopper pin 8011 prevents the connecting plate 8 at the completion of the insertion from rotating in either the clockwise direction or the counterclockwise direction, and the rotation angle of the connecting plate 8 at the completion of the insertion is completely set. It is provided for the purpose of maintaining.

In the fourth embodiment, as shown in FIG. 7, the shafts 9, the connecting pins 71, and the link pins 4 after the completion of the insertion are not aligned in a straight line, but centered on the shaft 91 of the shaft 9. As a result, the connecting pin 71 is at a position advanced in the clockwise direction from the link pin 4. Therefore, a large electromagnetic repulsive force generated when a large current flows between the contacts due to a short circuit or the like, a force that causes a large clockwise rotation force to the connecting plate 8 A stopper that engages the notch of the connecting plate 8 The rotation of the connecting plate 8 and the shaft 9 is prevented by the pins 801 1 and a short-time energization performance is achieved. Other configurations are the same as those in the first embodiment.

In FIG. 7, the drive shaft 16 and the stopper pin 8011 are mechanically interlocked using the interlocking shaft 1601 and the stopper lever 1602, but the operation of the electromagnetic operating mechanism 10 and the operation of the stopper pin 8011 are electrically connected. You can link them by other means, such as automatically linking them!

[0031] Embodiment 5

8 and 9 are configuration diagrams of the main part of the circuit breaker according to Embodiment 5 of the present invention. FIG. 8 shows a trip completion state, and FIG. 9 shows a closing completion state. As shown in FIGS. 8 and 9, the connection hole 810 provided in the connection plate 8 is composed of a first hole 811 and a second hole 812 that are bent and connected in an L shape. In the tripping complete state shown in FIG. 8, the connecting pin 161 provided on the drive shaft 16 is fitted in the second hole of the connecting hole 810, and in the closing completion state shown in FIG. 9, the connecting pin 161 fits into the first hole 811 of the connecting hole 810.

Other configurations are the same as those in the first embodiment.

[0032] When the movable contact 311 is fully inserted, the load force Fa acting on the operating arm 7 causes the load component Fb2 to act on the connecting pin 161 via the connecting plate 8 as shown in FIG. To do. Contact surface force of the first hole portion 811 of the connecting hole 810 that engages with the connecting pin 161 If the driving shaft 16 is parallel to the moving direction of the load 6, the load component force Fb2 is only the horizontal component of FIG. In the vertical direction, that is, in the moving direction of the drive shaft 16 of the electromagnetic operating mechanism 10, almost no load component force is generated except for a minute component due to manufacturing variations. Therefore, a large holding force is not required for the electromagnetic operation mechanism 10 to maintain the closing completion state, and the closing completion state can be maintained without increasing the size of the electromagnetic operation mechanism 10.

[0033] Embodiment 6

FIG. 10 is a configuration diagram of a main part of a circuit breaker according to Embodiment 6 of the present invention. In the sixth embodiment, as shown in FIG. 10, the connection hole 820 includes a first hole 821 and a second hole 822 that are bent at an angle of about 120 degrees and connected. When the movable contact is completely inserted, the connecting pin 161 provided on the drive shaft (not shown) is engaged with the inclined wall portion of the second hole portion 822 of the connecting hole 820! /

[0034] FIG. 10 shows an engagement state between the connecting pin 161 and the connecting hole 820 in the loading completion state, and a load force Fa (not shown) similar to the load force Fa shown in FIG. Therefore, if the X-axis and y-axis directions are defined as shown in Fig. 10, the load in the same direction as the drive shaft movement direction is applied to the connecting pin 161. A component force Fb3y is generated in the direction of the arrow and acts on the drive shaft of the electromagnetic operating mechanism. On the other hand, the frictional force Fc due to the engagement between the connecting pin 161 and the wall portion of the second hole portion 822 acts along the wall portion of the second hole portion 822, and the component force in the y-axis direction is the drive shaft. Acts as a frictional force Fcy in the direction of movement.

In addition,

Fcy = μ, Fb3

Where μ is the coefficient of friction.

This frictional component force Fcy is in the opposite direction to the load component force Fb3y, and reduces the load component force Fb3y that attempts to move the drive shaft in the direction of tripping via the connecting pin 161. Since the frictional force Fc is proportional to the friction coefficient of the side surface of the second hole 822 of the connecting hole 820, the high friction member having a large friction coefficient on the wall of at least the second hole 822 of the connecting hole 820. If the frictional force Fc is applied to the connecting pin 161 positively, a large frictional force Fcy that maintains the circuit breaker is fully generated is generated. It is possible to improve the characteristics.

Other configurations are the same as those in the first embodiment. Embodiment 7

FIG. 11 is a configuration diagram of a main part of a circuit breaker according to Embodiment 7 of the present invention. When the load force Fa described above is applied to the connecting pin 161 when the circuit breaker is fully charged, the load component force in the direction parallel to the direction of movement of the drive shaft 16 (y-axis direction) and the direction perpendicular to this (X (Axial direction) load component force acts on the drive shaft 16, and the drive shaft 16 may be deformed by the influence of the load component force in the vertical direction (X direction).

Therefore, in Embodiment 7 shown in FIG. 11, the drive shaft 16 of the electromagnetic operating mechanism 10 is lengthened, and this drive shaft 16 is supported by a pair of bearings 171 and 172 on both sides of the connecting plate 8. Yes. The connection pin 161 is provided on the drive shaft 16 between the bearings 171 and 172 and is fitted in the connection hole 810 of the connection plate 8.

According to the seventh embodiment, since the drive shaft 16 is supported by the pair of bearings 171 and 172, it is possible to prevent deformation of the drive shaft 7 and to improve the electromagnetic resistance characteristics when a large current is applied. it can.

[0038] Embodiment 8

Low voltage circuit breakers are often applied to three-phase circuits. Three-phase circuit breakers with fixed and movable contacts corresponding to each of the three phases are widespread. In the case of this three-phase circuit breaker, as the method of operation by the electromagnetic operation mechanism, it is possible to perform the three-phase batching and tripping operations. Alternatively, each phase can be turned on and off individually. However, FIG. 12 shows the configuration of the main part of the three-phase circuit breaker according to Embodiment 8 of the present invention, in which each phase is collectively operated by one electromagnetic operation mechanism 10. It is. In FIG. 12, the shaft 9 fixes three connecting plates 8a, 8b and 8c having the same structure. These connecting plates 8a, 8b and 8c are connected to the movable contacts 31la, 311b and 311c, respectively. Each connection plate 8a, 8b, 8c and the movable contact 31la, 311b, 311c are connected in the same manner as the shifting force of the first to seventh embodiments. The movable contacts 311a, 311b, and 311c are inserted into or removed from the fixed contacts 21la, 211b, and 211c connected to the conductors of the three phases, respectively.

[0039] The drive shaft 16 of the electromagnetic operating mechanism 10 is connected to one connecting plate 8b, and this connecting plate 8b is driven to rotate the shaft 9, so that the three phases can be turned on or off all at once. Do. Connecting plate The connection between 8b and drive shaft 16 is configured in the same manner as in any one of the first to seventh embodiments. According to the eighth embodiment, a three-phase circuit breaker having the same effect as any of the first to seventh embodiments can be obtained.

[0040] Embodiment 9

FIG. 13 shows the configuration of the main part of the circuit breaker according to Embodiment 9 of the present invention, in which a connecting plate 8d that connects to the drive shaft 16 of the electromagnetic operating mechanism 10 is provided separately. Other configurations are the same as those in the eighth embodiment.

According to this Embodiment 9, the connecting plates 8a, 8b, 8c connected to the movable contacts 311a, 311b, 311c and the connecting plate 8d connected to the drive shaft 16 are fixed to the shaft 9 at different angles, It is possible to obtain an optimum configuration for each connection.

In each of the above embodiments 1 to 9, the normal movable contact and the fixed contact are used, but it is needless to say that these contacts may be constituted by a vacuum valve.

Industrial applicability

[0042] The circuit breaker according to the present invention can be used as a circuit breaker for opening and closing a low-voltage distribution line or the like.

Brief Description of Drawings

FIG. 1 is a configuration diagram showing a circuit breaker according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram of a main part for explaining the operation of the circuit breaker according to Embodiment 1 of the present invention.

FIG. 3 is a configuration diagram of a main part for explaining the operation of the circuit breaker according to Embodiment 1 of the present invention.

FIG. 4 is a graph for explaining the operation of the circuit breaker according to Embodiment 1 of the present invention.

FIG. 5 is a configuration diagram of a main part of a circuit breaker according to Embodiment 2 of the present invention.

FIG. 6 is a configuration diagram of a main part of a circuit breaker according to Embodiment 3 of the present invention.

FIG. 7 is a configuration diagram of a main part of a circuit breaker according to Embodiment 4 of the present invention.

FIG. 8 is a configuration diagram of a main part of a circuit breaker according to Embodiment 5 of the present invention.

FIG. 9 is a configuration diagram of the main part for explaining the operation of the circuit breaker according to Embodiment 5 of the present invention. FIG. 10 is a configuration diagram of a main part of a circuit breaker according to Embodiment 6 of the present invention.

FIG. 11 is a configuration diagram of a main part of a circuit breaker according to Embodiment 7 of the present invention.

FIG. 12 is a configuration diagram of a main part of a circuit breaker according to Embodiment 8 of the present invention.

FIG. 13 is a configuration diagram of a main part of a circuit breaker according to Embodiment 9 of the present invention. Explanation of symbols

1 Insulated housing

101, 102 space

103 Insulating wall

21, 22 Fixed conductor

211, 211a, 211b, 211c Fixed contact

3 Mover

311, 311a, 311b, 311c Movable contact

4 Link pin

5 Contact spring

6 Flexible conductor

7 Operation arm

71, 161, 171, 172, 1611, 1612 Connecting pin

8, 8a, 8b, 8c, 8d connecting plate

81, 810, 820 Connecting hole

811, 821 1st hole

812, 822 2nd hole

9 Shaft

91 axis

10 Electromagnetic operation mechanism

11 York

12 First coil

13 Second coil 16 Drive shaft

17 Link 801, 8011 Snowno 802 Pin holder 1601 Interlock shaft 1602 Stroke ;; / Noreno 1613 Support pin 171, 172 Bearing

Claims

The scope of the claims

[1] A fixed conductor having a fixed contact, a mover having a movable contact, which is driven so as to be inserted into or pulled away from the fixed contact, and a pivotable center. The shaft is pivotally connected to the shaft by a first connecting portion at a first predetermined distance in a direction perpendicular to the axis, and is connected to the movable member by a second connecting portion. A second predetermined distance with respect to the shaft that is connected to the shaft by a connected operating arm and a third connecting portion provided at a different position in the circumferential direction of the shaft with respect to the first connecting portion. An electromagnetic operating means having a drive shaft driven so as to move on a straight line that is orthogonal to each other, and the shaft is rotated by driving the drive shaft by energizing the electromagnetic operating means. The mover is driven through the operation arm. Breaker to feature that it has to.

[2] The shaft center, the first connecting portion, and the second connecting portion are configured to be aligned substantially in a straight line when the fixed contact and the movable contact are completed. The circuit breaker according to claim 1.

[3] The stopper means for maintaining the axial center of the shaft, the first connecting portion, and the second connecting portion on the straight line when the charging is completed is provided. Circuit breaker described in 2.

4. The circuit breaker according to claim 3, wherein when the movable contact is pulled away from the fixed contact, the maintenance by the stopper means is released.

5. The circuit breaker according to claim 1, wherein the mover operating arm and the drive shaft are connected to the shaft via a connecting member fixed to the shaft.

[6] The connecting member includes a plate-like member, and the third connecting portion includes a connecting hole provided in the connecting member and a connecting pin provided in the driving shaft and slidably fitted in the connecting hole. The circuit breaker according to claim 5, comprising:

[7] The connecting hole has a bent portion having an inner wall extending parallel to a direction in which the drive shaft is driven when the insertion of the fixed contact and the movable contact is completed, and when the insertion is completed The circuit breaker according to claim 6, wherein the connecting pin contacts the inner wall of the bent portion. 8. The circuit breaker according to claim 7, wherein a high friction member having a friction coefficient larger than a friction coefficient of the inner wall is provided on the inner wall of the bent portion of the connection hole.

9. The circuit breaker according to claim 6, wherein the drive shaft is supported by bearings on both sides of the position where the connecting pin is provided.