WO2019077754A1

WO2019077754A1 - Breaker

Info

Publication number: WO2019077754A1
Application number: PCT/JP2017/038082
Authority: WO
Inventors: 隆之介今枝; 智也出口; 桂州近藤; 幸本　茂樹
Original assignee: 三菱電機株式会社
Priority date: 2017-10-20
Filing date: 2017-10-20
Publication date: 2019-04-25
Also published as: JP6858881B2; TW201917760A; TWI673744B; JPWO2019077754A1; CN111226301B; CN111226301A

Abstract

A breaker (1) is provided with: a transmission mechanism (30) for changing a cut-off state to a power-on state by moving a needle (6) in association with the movement of a plunger (23) of an electromagnetic solenoid (20); and a tripping mechanism (50). The plunger (23) reaches a first position where the movement of the plunger (23) is restricted before a toggle mechanism which includes an insulating bar (33) and a lever (32) of the transmission mechanism (30) reaches a dead point. The tripping mechanism (50) engages the transmission mechanism (30) and maintains the power-on state, in a situation where the plunger (23) has reached the first position and then has retreated so as to be located at a second potion.

Description

Circuit breaker

The present invention relates to a structure of a circuit breaker in which a movable contact is brought into contact with a fixed contact and a movable contact is separated from the fixed contact.

Conventionally, in a circuit breaker using an electromagnetic solenoid as a closing mechanism, a circuit breaker of a type in which a closed state is maintained by applying a current to the electromagnetic solenoid even after the closing has been mainly developed. However, in the circuit breaker which applies current to the electromagnetic solenoid even in the closed state, it is difficult to save energy, and the current flows to the closing coil constituting the electromagnetic solenoid and deterioration of the closing coil occurs. There was a problem that it was easy.

Therefore, in the case of the circuit breaker described in Patent Document 1, a circuit breaker of the type in which the closing state is maintained by the tripping mechanism after completion of closing, and the tripping mechanism is operated to open the circuit breaker and release the closing state at shutoff. Is being developed.

Japanese Patent Application Laid-Open No. 6-84433

However, in the circuit breaker disclosed in Patent Document 1, there are many parts that constitute a link mechanism that operates when the circuit breaker opens. As a result, many parts operate in a related manner to exhibit complex behavior, and continuing to be used for a long period of time causes breakage of parts or aging of mechanical characteristics, resulting in circuit breaker reliability. There is a possibility that the sex may decline.

Further, the circuit breaker described in Patent Document 1 shows a characteristic that the mechanism load rises upward from the cutoff state to the closing state, and the mechanism load in the closing state is the largest. Therefore, it is necessary to arrange a plurality of links to increase the reduction ratio and reduce the tripping load, and it is also necessary to fit a complicated mechanism for increasing the reduction ratio within a limited arrangement area, and also assemblability Getting worse.

The present invention has been made in view of the above, and it is an object of the present invention to provide a circuit breaker capable of reducing the load on the tripping mechanism, reducing the size of the tripping mechanism and improving the assemblability. Do.

In order to solve the problems described above and to achieve the object, the circuit breaker of the present invention comprises a housing, a fixed terminal attached to a fixed contact and fixed to the housing, and a first axial center fixed to the housing A mover holder rotatably connected to the casing, a mover rotatably connected to the mover holder and having a movable contact attached thereto, and the fixed contact and the movable contact when the fixed contact and the movable contact are in contact with each other A contact pressure spring that applies pressure to the contacts, an electromagnetic solenoid having a plunger that moves linearly, and a mover that moves the mover along with the movement of the plunger so that the moveable contact is separated from the fixed contact The transmission mechanism that changes to the closed state where the contact contacts the fixed contact to energize, engages with the transmission mechanism to hold the closed state, and releases the engagement with the transmission mechanism to cancel the held state of the closed state And a tripping mechanism. The transmission mechanism includes a lever that rotates about a second axis fixed to the housing along with the movement of the plunger, and one end portion thereof is rotatably coupled to one end portion of the lever, and the other end portion is rotatable to the mover And an insulating bar connected to the The plunger of the electromagnetic solenoid reaches a first position where movement of the plunger is limited before the toggle mechanism consisting of the lever and the insulating bar reaches its dead point. The tripping mechanism is engaged with the transmission mechanism in the second position to retract after the plunger reaches the first position, and holds the closed state.

ADVANTAGE OF THE INVENTION According to this invention, the load to a tripping mechanism can be reduced, and it is effective in the ability to aim at size reduction of a tripping mechanism, and the improvement of assembling property.

Sectional drawing which shows the structural example of the circuit breaker concerning Embodiment 1. Enlarged view of the tripping mechanism shown in FIG. 1 The block diagram which shows the interruption | blocking state of the circuit breaker concerning Embodiment 1. Enlarged view of the tripping mechanism shown in FIG. 3 The block diagram which shows the state of the contact contact start moment of the circuit breaker concerning Embodiment 1 Enlarged view of the tripping mechanism shown in FIG. 5 The block diagram which shows the state which reached the largest injection | throwing-in position of the circuit breaker concerning Embodiment 1. Enlarged view of the tripping mechanism shown in FIG. 7 An enlarged view of the tripping mechanism after the trip lever rotates from the state shown in FIG. 7 The block diagram which shows the state which reached the completion position of closing of the circuit breaker concerning Embodiment 1. An enlarged view of the tripping mechanism shown in FIG. FIG. 6 is a diagram showing the relationship between the movement position of the iron core plunger according to the first embodiment and the load amount applied to the electromagnetic solenoid. The block diagram which shows the interruption | blocking state of the circuit breaker concerning Embodiment 2. Enlarged view of the tripping mechanism shown in FIG. The block diagram which shows the state of the tripping mechanism in the case of the state of the contact contact start moment of the circuit breaker concerning Embodiment 2 The block diagram which shows the state of the tripping mechanism at the time of having reached the maximum injection | throwing-in position of the circuit breaker concerning Embodiment 2. The block diagram which shows the state of the tripping mechanism at the time of having reached the maximum injection | throwing-in position of the circuit breaker concerning Embodiment 2. The block diagram which shows the state of the tripping mechanism at the time of having reached the completion | finish completion position of the circuit breaker concerning Embodiment 2

Below, the circuit breaker concerning the embodiment of the present invention is explained in detail based on a drawing. The present invention is not limited by the embodiment.

Embodiment 1
The circuit breaker according to the first embodiment is an air circuit breaker that opens and closes an electric path such as a low voltage distribution line, and detects at least one of an overcurrent and an electric leakage to interrupt the electric path. In the following, for convenience of explanation, the positive direction of Z-axis is upward, the negative direction of Z-axis is downward, the positive direction of X-axis is rightward, the negative direction of X-axis is leftward, and the positive direction of Y-axis is forward, The Y-axis negative direction is the rear. Further, in the following, clockwise and counterclockwise mean clockwise and counterclockwise in the drawings described later.

FIG. 1 is a view showing a configuration example of a circuit breaker according to a first embodiment of the present invention. As shown in FIG. 1, the circuit breaker 1 according to the first embodiment includes a housing 2 formed of an insulating member, and a power supply side which is attached to the housing 2 through the wall 2 a of the housing 2. The terminal 3 and the load side terminal 4, and the flexible conductor 5 whose one end 5 a is connected to the load side terminal 4 in the housing 2 are provided. Further, in the circuit breaker 1, the mover 6 whose one end 6 a is connected to the other end 5 b of the flexible conductor 5 and the one end 7 a is rotatably attached to the housing 2 inside the housing 2 A mover holder 7, and a contact pressure spring 8 having one end and the other end attached to the other end 7 b of the mover holder 7 and the other end 6 b of the mover 6 are provided.

The power supply side terminal 3 is connected to a power supply side conductor (not shown) outside the housing 2, and the load side terminal 4 is connected to a load side conductor (not shown) outside the housing 2. In the power supply side terminal 3, the fixed contact 10 is electrically connected inside the housing 2, and the movable contact 11 is electrically connected to the other end 6 b of the mover 6. The power supply side terminal 3 and the load side terminal 4 are fixed apart from each other. In the example shown in FIG. 1, the power supply side terminal 3 is disposed above the load side terminal 4, but the load side terminal 4 may be disposed above the power supply side terminal 3.

The flexible conductor 5 is a flexible conductor, and one end 5 a is connected to the load side terminal 4 and the other end 5 b is connected to the mover 6. The load-side terminal 4 and the mover 6 are electrically connected by the flexible conductor 5. As described above, the movable contact 11 is electrically connected to the mover 6, and the movable contact 11 contacts the fixed contact 10, so that the power supply side terminal 3 and the load side terminal 4 of the circuit breaker 1 are electrically connected. It is connected to the power supply and is in the energized state. When the movable contact 11 is separated from the fixed contact 10, the circuit breaker 1 is brought into a disconnection state in which the power supply side terminal 3 and the load side terminal 4 are electrically disconnected.

One end 7 a of the mover holder 7 is attached to the housing 2 by the holder shaft 12 so as to be rotatable about the holder axis 12 a. The intermediate portion 7 c of the mover holder 7 is rotatably attached to one end 6 a of the mover 6 by the connecting pin 13. A mover stopper 9 is provided on the mover holder 7.

The mover stopper 9 limits the angle at which the mover 6 rotates about the connecting pin 13 with respect to the mover holder 7. One end 6 a of the mover 6 is in contact with the mover stopper 9 in the state shown in FIG. 1. Therefore, although the movement of the other end 6b of the mover 6 in the direction away from the other end 7b of the mover holder 7 is restricted by the mover stopper 9, the other end 6b of the mover 6 is a mover It is possible to rotate in the direction approaching the other end 7 b of the holder 7.

The contact pressure spring 8 is a spring for pressing the movable contact 11 against the fixed contact 10. In the state shown in FIG. 1, the contact pressure spring 8 is stored in a state shorter than the natural length, and is in a state where it has a predetermined initial contact pressure in advance. Therefore, when the other end 6 b of the mover 6 rotates in the direction approaching the other end 7 b of the mover holder 7, the distance between the other end 6 b of the mover 6 and the other end 7 b of the mover holder 7 is The contact pressure spring 8 is further stored.

Further, the circuit breaker 1 transmits the driving force of the electromagnetic solenoid 20 and the movable member 6 to the movable element 6 as the closing actuator of the circuit breaker 1 and the fixed contact of the movable contact 11. 10, an opening spring 40 having one end and the other end attached to the transmission mechanism 30 and the transmission mechanism 30 and the housing 2, maintaining the closed state and releasing the closed state And a tripping mechanism 50.

The electromagnetic solenoid 20 includes a yoke 21 formed of a magnetic material, an input coil 22 wound around a bobbin (not shown) and fixed inside the yoke 21, and an iron core plunger 23 capable of reciprocating in a linear fashion in the vertical direction. And a protrusion 24 formed on the top of the core plunger 23. At least one of the electromagnetic solenoid 20 and the housing 2 is provided with a guide (not shown) for guiding the moving direction of the iron core plunger 23 in the vertical direction, and the iron core plunger 23 is displaced only in the vertical direction by such a guide. It is possible. The core plunger 23 and the projection 24 may be fixed, and the method of fixing the core plunger 23 and the projection 24 does not matter.

The energization of the closing coil 22 generates an electromagnetic attraction in the electromagnetic solenoid 20. Due to the generation of the electromagnetic attraction force, the core plunger 23 moves upward, and when the gap 25 between the core plunger 23 and the inside of the input coil 22 disappears, the movement of the core plunger 23 is restricted and the core plunger 23 is restricted. Physically stop. As described above, the position at which the core plunger 23 stops is the position at which the core plunger 23 is in the uppermost direction, and hereinafter referred to as the maximum loading position or the maximum movement position. In addition, the structure which the iron core plunger 23 stops is not limited to the example mentioned above. For example, the projection may be provided at the lower part of the iron core plunger 23 and the iron core plunger 23 may be physically stopped by being locked to the bobbin or the yoke 21 of the input coil 22.

After a predetermined time has elapsed after the position of the iron core plunger 23 reaches the maximum loading position, the electromagnetic solenoid 20 stops the generation of the electromagnetic attraction force by stopping the energization of the loading coil 22. When the electromagnetic attraction force of the electromagnetic solenoid 20 disappears, the iron core plunger 23 exerts a downward force from the maximum insertion position due to, for example, the weight of the iron core plunger 23 and the opening spring 40 as much as possible.

The transmission mechanism 30 includes a connecting link 31 whose one end 31a is rotatably connected to the projection 24 of the electromagnetic solenoid 20, a lever 32 which is rotatably connected to the other end 31b of the connecting link 31, and a lever 32. And an insulating bar 33 rotatably coupled to one end 32a.

One end 31a of the connection link 31 is rotatably connected to the projection 24 of the electromagnetic solenoid 20 by the connection pin 34, and the other end 31b of the connection link 31 is rotatably connected to the lever 32 by the connection pin 35. .

The lever 32 is rotatably attached to the lever shaft 37 about a lever axis 36 whose absolute position is fixed with respect to the housing 2. The lever 32 is connected to the other end 31 b of the connection link 31 by the connection pin 35 in a region closer to the tripping mechanism 50 than the lever shaft 37. Further, the transmission mechanism 30 of the circuit breaker 1 includes an engagement pin 51, and the engagement pin 51 is fixed to the other end 32 b of the lever 32.

The insulating bar 33 has one end 33a rotatably connected to one end 32a of the lever 32 by the connecting pin 38, and the other end 33b rotatably mounted to the one end 6a of the mover 6 by the connecting pin 13 . The insulating bar 33 is made of a highly electrically insulating material such as resin. Therefore, the current flowing between the power supply side terminal 3 and the load side terminal 4 does not leak through the lever 32 when the circuit breaker 1 is in the energized state. The whole of the insulating bar 33 does not have to be an insulating material, and as long as the connecting pin 13 and the connecting pin 38 are in an insulating state, a part of the insulating bar 33 may be made of a conductor.

The lever 32 and the insulating bar 33 constitute a toggle mechanism in a four-bar link having the lever axis 36 and the holder axis 12 a as a fixed rotation center. Therefore, the transmission mechanism 30 can be driven with a small force as the lever axial center 36, the connecting pin 38, and the connecting pin 13 approach a dead point where they are linearly arranged. The protrusion 24, the connection link 31, the lever 32, the insulating bar 33, the mover 6 and the mover holder 7 constitute a link structure.

As described above, the opening spring 40 has one end and the other end attached to the lever 32 and the housing 2, and the elastic restoring force of the opening spring 40 causes the transmission mechanism 30 to be described later. It is biased in the direction of displacement.

As described above, the tripping mechanism 50 has the functions of maintaining the on state and releasing the on state. FIG. 2 is an enlarged view of the tripping mechanism shown in FIG. In addition, in FIG. 2, the housing | casing 2 of the circuit breaker 1 is shown with the broken line.

As shown in FIG. 2, the tripping mechanism 50 includes a trip lever 52 engaged with an engagement pin 51 fixed to the other end 32 b of the lever 32, and one end and the other of the trip lever 52 and the housing 2. And a first reset spring 53 attached to the end. Further, the tripping mechanism 50 includes a trip bar 54 which is rotated by a driving force of an actuator (not shown), and a second reset spring 55 having one end and the other end attached to the trip bar 54 and the housing 2. Equipped with

The engagement pin 51 protrudes from the lever 32 to the right orthogonal to the extending direction of the lever 32. One end 52a of the trip lever 52 is rotatably mounted around the trip lever shaft center 60 fixed to the housing 2, and the other end 52b has an arc surface that contacts the engagement pin 51 in the closing process. Arc portion 56 is formed. In the middle of the trip lever 52, a recess 52c that is recessed rearward is formed. An engaging surface 57 that engages with the engaging pin 51 in the inserted state is formed in the recess 52c. Further, an engagement portion 59 that engages with the trip bar 54 is provided in a region on the front side of the other end 52 b of the trip lever 52.

One end 54 a of the trip bar 54 is attached to the housing 2 rotatably around the trip bar axis 61, and has a semicircular semicircular portion 58 around the trip bar axis 61. There is. The semicircular portion 58 is formed by an arc portion 58a having an arc surface and a flat portion 58b having a flat surface.

The semicircular portion 58 is rotated about the trip bar axis 61 by the driving force of an actuator (not shown), and the arc portion 58a of the semicircular portion 58 is engaged with the engaging portion 59 formed on the one end 52a of the trip lever 52 Thus, the forward rotation of the other end 52b of the trip lever 52 is restricted.

The second reset spring 55 biases the trip bar 54 in such a direction as to rotate the other end 54 b of the trip bar 54 directed upward in a direction toward the front about the trip bar axis 61. That is, the second reset spring 55 biases the trip bar 54 clockwise.

The operation of the circuit breaker 1 configured as described above will be specifically described. FIG. 3 is a block diagram showing the circuit breaker of the first embodiment in the disconnected state, and FIG. 4 is an enlarged view of the tripping mechanism shown in FIG. FIG. 5 is a configuration diagram showing a state of contact contact start moment of the circuit breaker according to the first embodiment, and FIG. 6 is an enlarged view of the tripping mechanism shown in FIG. FIG. 7 is a configuration diagram showing a state where the maximum closing position of the circuit breaker according to Embodiment 1 has been reached, FIG. 8 is an enlarged view of the tripping mechanism shown in FIG. 7, and FIG. It is an enlarged view of the tripping mechanism after the trip lever rotates from the state shown in. FIG. 10 is a block diagram showing a state where the closing completion position of the circuit breaker according to the first embodiment is reached, and FIG. 11 is an enlarged view of the tripping mechanism shown in FIG. In FIGS. 3 to 11, the housing 2 is indicated by a broken line.

As shown in FIG. 3, when the circuit breaker 1 is in the shutoff state, the iron core plunger 23 constituting the electromagnetic solenoid 20 reaches the lowermost part by the open electrode spring 40 and is in physical contact with the housing 2 It can not descend further than this. At this time, the size of the gap 25 is maximum.

When the iron core plunger 23 is at the lowermost portion, the other end 32 b of the lever 32 is located below the one end 32 a and is opposite to the one end 52 a of the trip lever 52 in the left-right direction. Further, one end 52 a of the trip lever 52 is tensioned rearward by the elastic restoring force of the first reset spring 53. Therefore, the engagement pin 51 attached to the other end 32 b of the lever 32 is in a state of being in contact with the arc portion 56 formed on the one end 52 a of the trip lever 52.

When the circuit breaker 1 is in the shutoff state, rotation of the mover 6 in a direction to move the other end 6b of the mover 6 away from the other end 7b of the mover holder 7 by the mover stopper 9 of the mover holder 7, The clockwise rotation of the mover 6 is limited. Since the contact pressure spring 8 is in a state of having a constant initial contact pressure in advance as described above, as long as the pressing reaction force from the fixed contact 10 to the movable contact 11 does not exceed the initial contact pressure, One end portion 6 a of the mover 6 does not separate from the mover stopper 9.

As shown in FIG. 3, when the circuit breaker 1 is in the disconnection state, the separation distance, which is the physical shortest distance between the movable contact 11 of the mover 6 and the fixed contact 10, is maximum. In the state shown in FIG. 3, as shown in FIG. 4, the elastic restoring force by the second reset spring 55 that causes the flat portion 58 b of the semicircular portion 58 of the trip bar 54 to rotate the trip bar 54 clockwise. , And contacts the corner portion of the engaging portion 59 formed at the one end 52a of the trip lever 52. Therefore, the rotation of the trip lever 52 is limited, and the state shown in FIG. 4 is maintained.

Further, one end 52a of the trip lever 52 is an arc portion by the elastic restoring force of the first reset spring 53 which tries to rotate the trip lever 52 clockwise so that the one end 52a of the trip lever 52 is directed backward. At 56, it is in contact with the engagement pin 51 of the lever 32. Thereby, the clockwise rotation of the trip lever 52 is limited, and the state shown in FIG. 4 is maintained.

When energization is performed to the input coil 22 of the electromagnetic solenoid 20 in the state where the circuit breaker 1 is in the shutoff state, as shown in FIG. 5, the iron core plunger 23 is moved upward. The upward movement of the iron core plunger 23 causes the lever 32 to rotate about the lever axis 36, and the connecting angle between the lever 32 and the insulating bar 33 becomes smaller. The connection angle is an angle between the extension direction of the lever 32 and the extension direction of the insulating bar 33. The connection angle decreases as the circuit breaker 1 changes from the state shown in FIG. 3 to the state shown in FIG.

As the coupling angle decreases, the mover 6 moves forward, and the fixed contact 10 and the movable contact 11 contact. The state at the moment when the movable contact 11 and the fixed contact 10 start contact is the contact contact start state. At this time, a current flows between the power supply side terminal 3 and the load side terminal 4 through the fixed contact 10, the movable contact 11 and the flexible conductor 5.

Further, as shown in FIGS. 4 and 6, the engagement pin 51 attached to the tip of the lever 32 rotatable about the lever axis 36 has a second reset spring 55 as the coupling angle decreases. While sliding in a circular arc portion 56 formed at the other end 52b of the trip lever 52 while maintaining a state in contact with the trip lever 52 to which an elastic restoring force is given.

The arc portion 56 of the trip lever 52 is formed by an arc centered on the lever axis 36 of the lever 32. Therefore, the position of the trip lever 52 does not change even if the engagement pin 51 moves from the state shown in FIG. 4 to the state shown in FIG.

When the circuit breaker 1 reaches the contact contact start state, the clockwise rotation of the mover 6 is restricted by the mover stopper 9 provided on the mover holder 7, but counterclockwise rotation is possible. It is. When the iron core plunger 23 further advances from the contact contact start state shown in FIG. 6, the contact reaction force from the fixed contact 10 with respect to the movable contact 11 attached to the other end 6b of the mover 6 increases. The other end 6 b of the element 6 rotates counterclockwise around the connection pin 13 and approaches the other end 7 b of the mover holder 7. Therefore, the contact pressure spring 8 is further charged from the state shown in FIG.

As shown in FIG. 7, when the position of the iron core plunger 23 reaches the maximum closing position by the upward movement of the iron core plunger 23, the movable contact 11 receives the reaction force from the fixed contact 10 against the movable element holder 7 of the movable element 6. The angle of rotation is maximized, and the amount of energy stored in the contact pressure spring 8 is also maximized.

In addition, when the position of the iron core plunger 23 reaches the maximum insertion position, as shown in FIG. 8, the engagement pin 51 sliding on the arc portion 56 of the trip lever 52 passes the arc portion 56 of the trip lever 52. Thus, the upper portion of the engagement surface 57 of the trip lever 52 is reached. Therefore, the engagement pin 51 momentarily comes into non-contact with the trip lever 52.

The trip lever 52 whose clockwise rotation is restricted by the engagement pin 51 is released from the restriction of clockwise rotation when the relationship with the engagement pin 51 changes to a non-contact state. Therefore, as shown in FIG. 9, the recess 52 c of the trip lever 52 is rotated clockwise by the elastic restoring force of the first reset spring 53 and contacts the engagement pin 51. By the engagement pin 51 coming into contact with the recess 52 c of the trip lever 52, the clockwise rotation of the trip lever 52 is restricted.

Also, when the engagement pin 51 reaches the upper part of the engagement surface 57 of the trip lever 52 and the trip lever 52 rotates, the trip bar 54 whose clockwise rotation is restricted by the trip lever 52 is the second reset spring 55 Is rotated clockwise by the elastic restoring force, and, as shown in FIGS. 8 and 9, the arc portion 58a of the semicircular portion 58 wraps over the engaging portion 59 and stops. The circuit breaker 1 is provided with a stopper (not shown) for restricting the rotation of the trip bar 54, and the rotation of the trip bar 54 is restricted in the state shown in FIG. 8 and FIG.

After the position of the iron core plunger 23 reaches the maximum input position, the energization of the electromagnetic solenoid 20 is completed. When energization of the electromagnetic solenoid 20 is completed, the drive to the transmission mechanism 30 by the electromagnetic solenoid 20 is released.

Therefore, the reaction force by the stored contact pressure spring 8 acts between the fixed contact 10 and the movable contact 11, and the iron core plunger 23 of the electromagnetic solenoid 20 is cut off from the maximum closing position through the transmission mechanism 30. A force is generated that tries to push back in the direction of movement. Further, due to the weight of the iron core plunger 23 and the opening force of the opening spring 40, the force in the direction to move the iron core plunger 23 from the maximum insertion position to the shut-off position also works simultaneously. Thereby, the iron core plunger 23 starts to move downward from the maximum insertion position shown in FIG.

When the iron core plunger 23 moves downward from the maximum insertion position, the lever 32 rotates counterclockwise around the lever axis 36. When the lever 32 rotates counterclockwise, the engagement pin 51 rotates counterclockwise around the lever axis 36 and, as shown in FIGS. 10 and 11, on the engagement surface 57 of the trip lever 52. The iron core plunger 23 comes into contact with the charging completion position, and the closing operation of the circuit breaker 1 is completed.

The tripping lever 52 engages with the flat portion of the engaging portion 59 formed on the one end 52a of the trip lever 52 when the core plunger 23 is in the loading completion position. The rotation of the other end 52b of the trip lever 52 to the front side is restricted.

Therefore, in spite of the force based on the reaction force of the contact pressure spring 8 trying to rotate the trip lever 52 counterclockwise with respect to the trip lever axial center 60 through the engagement pin 51, the trip lever 52 As a result, as shown in FIG. 11, the rotation of the semicircular portion 58 is not restricted by the rotation of the arc portion 58a.

As described above, when the circuit breaker 1 is in the shutoff state, the contact pressure spring 8 is previously given a constant initial contact pressure, and the fixed contact 10 is started from the moment when the movable contact 11 starts contact with the fixed contact 10. The contact pressure of the movable contact 11 with respect to is set to be strong. Therefore, when the circuit breaker 1 is in the energized state, occurrence of separation between the contacts due to the electromagnetic repulsive force generated between the movable contact 11 and the fixed contact 10 is prevented, and a later-described tripping command is issued. The opening speed of the rear movable contact 11 and the fixed contact 10, that is, the opening speed can be increased.

Next, the tripping operation in the circuit breaker 1 will be described. When the circuit breaker 1 is in the closing completion position shown in FIG. 10 and a tripping command is given to the circuit breaker 1 from the outside, the tripping bar 54 is turned counterclockwise by an actuator (not shown) provided on the circuit breaker 1. It is driven to be rotated around.

The counterclockwise rotation of the trip bar 54 separates the arc portion 58a of the semicircular portion 58 of the trip bar 54 from the engagement portion 59 of the trip lever 52, and the engagement between the arc portion 58a and the engagement portion 59 is released. Be done. Therefore, the force based on the reaction force of the contact pressure spring 8 causes the trip lever 52 to rotate counterclockwise centering on the trip lever axial center 60, and the iron core plunger 23 is moved to the shut off position of FIG. Return. Thus, the tripping of the circuit breaker 1 is completed.

Here, the relationship between the movement position of the iron core plunger 23 and the load amount applied to the electromagnetic solenoid 20 will be described. FIG. 12 is a diagram showing the relationship between the movement position of the iron core plunger according to the first embodiment and the load amount applied to the electromagnetic solenoid. The iron core plunger 23 moves in a range from the position shown in FIG. 3 to the maximum charging position shown in FIG.

In the following, the upward movement of the iron core plunger 23 is described as forward, and the downward movement of the iron core plunger 23 is described as backward. In addition, the movement position of the core plunger 23 during advancement is described as an advancement position, and the movement position of the core plunger 23 during retraction is described as a retracted position. Further, a load applied to the electromagnetic solenoid 20 when the core plunger 23 moves forward is referred to as a forward load, and a load applied to the electromagnetic solenoid 20 when the core plunger 23 retracts is referred to as a reverse load.

As shown in FIG. 12, when the advancing position of the iron core plunger 23 is in the blocking state position from the blocking state position to the contact contact start position, transmission is performed in a state where the fixed contact 10 and the movable contact 11 are not in contact. The mechanism 30 is driven. Therefore, when the advancing position of the iron core plunger 23 is in the blocking state, the load applied to the electromagnetic solenoid 20 is relatively small. Then, when the advancing position of the iron core plunger 23 becomes the contact contact start position, the contact of the movable contact 11 with the fixed contact 10 starts. Therefore, the lever 32 receives the reaction force from the contact pressure spring 8 as a counterclockwise load torque centered on the lever axial center 36 via the connection pins 13 and 38, and the input load applied to the electromagnetic solenoid 20 rapidly growing.

However, when the iron core plunger 23 further advances, the component in the direction perpendicular to the straight line connecting the lever axial center 36 and the connection pin 38 in the reaction force from the contact pressure spring 8 acting on the connection pin 38 acting as the action point becomes sharply small. Become. Therefore, the counterclockwise load torque centered on the lever axis 36 starts to decrease. As the load torque decreases, the load on the electromagnetic solenoid 20 required to rotate the lever 32 also starts to decrease.

In the mechanical state of the circuit breaker 1 in which the iron core plunger 23 is further advanced and the advancing position becomes the maximum closing position only after the closing operation starts, the lever 32 and the insulating bar 33 become close to a straight line, and the lever 32 and the insulating bar 33 The toggle mechanism composed of the two approaches the dead center most. Therefore, the component in the direction perpendicular to the straight line connecting the lever shaft center 36 and the connecting pin 38 in the reaction force from the contact pressure spring 8 acting on the connecting pin 38 approaches zero, and the electromagnetic solenoid 20 necessary to rotate the lever 32 The input load of will rapidly approach zero. That is, the load force action which is the distance by which the iron core plunger 23 of the electromagnetic solenoid 20 advances to apply the load torque to the lever 32 in accordance with the power input of the electromagnetic solenoid 20 which increases due to the displacement from the shut off position to the on position. It is configured to reduce the distance. Therefore, the electromagnetic attraction force of the electromagnetic solenoid 20 can not only be used efficiently for the closing operation of the circuit breaker 1, but also the electromagnetic solenoid 20 of the size adapted to the change of the load force action distance necessary for the closing operation of the circuit breaker 1. The size and cost of the electromagnetic solenoid 20 can be reduced. Further, in the circuit breaker 1 according to the first embodiment, the iron core plunger 23 is configured to stop advancing before the above-described toggle mechanism exceeds the dead point, and the dead point occurs at the transition from the on state to the off state. The complexity of the configuration of the tripping mechanism 50 can be avoided.

In the state after contact contact in the circuit breaker 1, when contact pressure is generated by receiving a reaction force from the contact pressure spring 8 due to contact between the movable contact 11 and the fixed contact 10, back and forth to the lever shaft 37 through the insulating bar 33 and the lever 32 A pressing force in the direction is generated. When a pressing force against the lever shaft 37 is generated, a friction torque is generated against the lever shaft 37, and the sliding friction load of the electromagnetic solenoid 20 in the vertical direction due to the longitudinal component of the load transmitted to the electromagnetic solenoid 20 through the connection link 31. Together increase the input load of the electromagnetic solenoid 20 as a non-negligible frictional force.

After the iron core plunger 23 reaches the maximum loading position, when the movement direction of the iron core plunger 23 changes to reverse, the direction of the frictional force applied to the entire transmission mechanism 30 also changes. Therefore, the load on the tripping mechanism 50 in the input state can be reduced by the reduction effect of the tripping load derived from the frictional force.

As described above, since the load on the tripping mechanism 50 in the charged state can be reduced, the configuration of the tripping mechanism 50 can be simplified. Therefore, downsizing of the tripping mechanism 50 can be achieved, and downsizing of the circuit breaker 1 can be achieved, and reliability in durability of the tripping mechanism 50 is reduced by reducing the number of parts of the tripping mechanism 50. It is possible to raise sex.

Until the movable contact 11 comes into contact with the fixed contact 10, the frictional force associated with the rotation of each of the rotating parts of the connection pins 13, 38, the lever shaft 37, and the connection pins 34, 35 is mainly generated. Therefore, until the movable contact 11 contacts the fixed contact 10, the friction torque with respect to the lever shaft 37 and the sliding friction load in the vertical direction of the electromagnetic solenoid 20 are contact pressure springs 8 after the movable contact 11 and the fixed contact 10 contact. It is smaller than the state after the contact pressure by the reaction force from. Therefore, as shown in FIG. 12, the difference between the forward load and the reverse load due to the frictional force before contact is smaller than the difference between the load due to the frictional force after contact.

For a series of closing operations and closing loads of the circuit breaker 1, the load characteristics required for closing the electromagnetic solenoid 20 in the circuit breaker 1 can be formulated. For example, by formulating the load characteristics necessary for turning on the electromagnetic solenoid 20 in each state of FIG. 3, FIG. 5, FIG. 7 and FIG. It is possible to reduce the design of the circuit breaker 1 having hysteresis in the input load characteristics of the electromagnetic solenoid 20.

As described above, the circuit breaker 1 according to the first embodiment transmits the housing 2, the power supply side terminal 3, the mover holder 7, the mover 6, the contact pressure spring 8, and the electromagnetic solenoid 20. A mechanism 30 and a tripping mechanism 50 are provided. The power supply side terminal 3 is an example of a fixed terminal, and the fixed contact 10 is attached and fixed to the housing 2. The mover holder 7 is coupled to the housing 2 so as to be rotatable around a holder axial center 12 a fixed to the housing 2. The holder axis 12a is an example of a first axis. The mover 6 is rotatably connected to the mover holder 7, and the movable contact 11 is attached. The contact pressure spring 8 applies pressure to the fixed contact 10 and the movable contact 11 when the fixed contact 10 contacts the movable contact 11. The electromagnetic solenoid 20 has an iron core plunger 23 which moves linearly. The iron core plunger 23 is an example of a plunger. The transmission mechanism 30 moves the mover 6 in accordance with the movement of the iron core plunger 23, and the movable contact 11 contacts the fixed contact 10 in a closed state where the movable contact 11 is separated from the fixed contact 10. Change to The tripping mechanism 50 engages with the transmission mechanism 30 to hold the input state, and releases the engagement with the transmission mechanism 30 to release the holding of the input state. The transmission mechanism 30 includes a lever 32 and an insulating bar 33. The lever 32 rotates about a lever axis 36 fixed to the housing 2 with the movement of the iron core plunger 23. The lever axis 36 is an example of a second axis. One end 33 a of the insulating bar 33 is rotatably connected to one end 32 a of the lever 32, and the other end 33 b is rotatably connected to the mover 6. The iron core plunger 23 of the electromagnetic solenoid 20 reaches the maximum movement position where the movement of the plunger 23 is limited before the toggle mechanism composed of the lever 32 and the insulating bar 33 reaches the dead point. Therefore, for example, by setting the maximum movement position of the iron core plunger 23 to a position just before the toggle mechanism reaches the dead point, the electromagnetic solenoid 20 required to rotate the lever 32 by the effect of the forceps by the toggle mechanism. The load can be made to approach zero rapidly. Therefore, the load applied to the tripping mechanism 50 in the on state can be reduced. In addition, the position just before becoming a dead center mentioned above is a position which does not reach a dead center, even when there is a manufacturing error. The maximum movement position is an example of the first position. Further, the tripping mechanism 50 is engaged with the transmission mechanism 30 in a state where the iron core plunger 23 reaches the maximum movement position and then retreats after being reached the maximum movement position to hold the charging state. The input completion position is an example of the second position. Thereby, when the moving direction of the iron core plunger 23 is changed to reverse, the direction of the frictional force applied to the whole of the transmission mechanism 30 is also changed, so the load reducing effect derived from the frictional force, that is, the hysteresis of the input load characteristic Thus, the load on the tripping mechanism 50 in the on state can be reduced. Therefore, it is possible to reduce the necessity of making the tripping mechanism of the circuit breaker complicated, and to miniaturize the tripping mechanism 50 and to improve the assemblability.

The circuit breaker 1 also includes an engagement pin 51 attached to the other end 32 b of the lever 32. The engagement pin 51 is an example of the engagement portion. The tripping mechanism 50 also includes a trip lever 52 and a trip bar 54. The trip lever 52 is rotatably attached to the housing 2 in a state of being biased in a direction toward the engagement pin 51, and in a state of being in contact with the engagement pin 51 in the charging process of shifting from the blocking state to the charging state. And engages with the engagement pin 51 in a state where the iron core plunger 23 is in the insertion completion position, thereby restricting the rotation of the lever 32 about the lever axis 36. The trip bar 54 regulates and cancels the rotation of the trip lever 52. As described above, since the tripping mechanism 50 can be constituted by at least two members including the trip lever 52 and the trip bar 54 except the engagement pin 51, the miniaturization and the improvement of the assemblability of the tripping mechanism 50 can be achieved. Can be Further, since the engaging pin 51 is brought into contact with the trip lever 52 from the blocking state to the closing state, the tripping operation is easily performed only by changing the movable amount of the trip lever 52 in the direction away from the engaging pin 51. be able to.

Further, the trip lever 52 has an arc shape centering on the lever axis 36, and engages with the arc portion 56 in which the engagement pin 51 movably contacts in the closing process and the engagement pin 51 in the closing state And a recess 51c. As a result, the position of the trip lever 52 does not change in the closing process, so that the load of the electromagnetic solenoid 20 for driving the transmission mechanism 30 can be prevented from fluctuating by the trip lever 52 in the closing process.

In addition, the trip lever 52 is provided with a semicircular portion 58 which is formed with an arc portion 58 a and a flat portion 58 b and rotates around a trip bar axis 61 fixed to the housing 2. The trip bar axis 61 is an example of a third axis. The trip lever 52 contacts the flat portion 58b of the semicircular portion 58 in the closed state to restrict its rotation, and contacts the arc portion 58a of the semicircular portion 58 in the closed state to restrict its rotation. Thereby, only by rotating the trip lever 52, the movable amount of the trip lever 52 in the direction away from the engagement pin 51 can be easily adjusted.

Second Embodiment
The second embodiment differs from the first embodiment in that a trip latch and a third reset spring are added between the trip lever and the trip bar in the tripping mechanism. In the following, components having the same functions as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted, and differences from the circuit breaker 1 of the first embodiment will be mainly described.

FIG. 13 is a block diagram showing a breaker state of the circuit breaker according to the second embodiment, FIG. 14 is an enlarged view of the tripping mechanism shown in FIG. 13, and FIG. 15 is a breaker according to the second embodiment. It is a block diagram which shows the state of the tripping mechanism in the case of the state of the contact contact start moment of a container. FIGS. 16 and 17 are configuration diagrams showing the state of the tripping mechanism in the state where the maximum closing position of the circuit breaker according to the second embodiment is reached, and FIG. 18 is a circuit diagram of the circuit breaker according to the second embodiment. It is a block diagram which shows the state of the tripping mechanism in the state which reached the completion position of injection | throwing-in. In FIGS. 13 to 18, the housing 2 is indicated by a broken line.

As shown in FIG. 13, the circuit breaker 1A according to the second embodiment includes a housing 2, a power supply side terminal 3, a load side terminal 4, a flexible conductor 5, a mover 6, and a mover holder. 7, a contact pressure spring 8, an electromagnetic solenoid 20, a transmission mechanism 30, an open electrode spring 40, and a tripping mechanism 70.

As shown in FIG. 14, the tripping mechanism 70 includes a trip lever 71 engaged with an engagement pin 51 fixed to the other end 32 b of the lever 32, and one end and the other of the trip lever 71 and the housing 2. And a first reset spring 72 attached to the end. Further, the tripping mechanism 70 includes a trip bar 73 which is rotated by a driving force of an actuator (not shown), and a second reset spring 74 having one end and the other end attached to the trip bar 73 and the housing 2. Equipped with Further, the tripping mechanism 70 is provided between the trip lever 71 and the trip bar 73, and has a trip latch 75, and a third one in which one end and the other end are attached to the trip latch 75 and the housing 2. And the reset spring 76 of FIG.

The trip lever 71 is rotatably mounted on the housing 2 around the trip lever axis 80, and at one end 71a of the trip lever 71, an arc 77 is formed which comes into contact with the engagement pin 51 in the closing process. It is done. The other end 71 b of the trip lever 71 protrudes forward and faces the trip latch 75. At a midway portion of the trip lever 71, a concave portion 71c which is recessed rearward is formed. An engagement surface 79 that engages with the engagement pin 51 is formed in the recess 71 c. The first reset spring 72 biases the trip lever 71 counterclockwise around the trip lever axis 80.

The trip bar 73 has one end 73 a rotatably attached to the casing 2 about the trip bar axis 81 and has a semicircular semicircle 78 around the trip bar axis 81. There is. The second reset spring 74 biases the other end 73 b of the trip bar 73 clockwise about the trip bar axis 81. The trip bar 73 rotates about the trip bar axis 81 by the driving force of an actuator (not shown).

The trip latch 75 is formed in an L shape in a side view, and a central portion 75 c is rotatably attached to the housing 2 about the trip latch axial center 82. The third reset spring 76 biases the trip latch 75 counterclockwise around the trip latch axial center 82.

The state of the circuit breaker 1A shown in FIG. 14 is the interruption state. In the blocking state shown in FIG. 14, the trip lever 71 is biased counterclockwise by the elastic restoring force of the first reset spring 72. Therefore, the state in which the arc portion 77 formed in front of the one end portion 71 a of the trip lever 71 contacts the engagement pin 51 is maintained.

Further, the trip latch 75 is biased counterclockwise by the elastic restoring force of the third reset spring 76, and one end 75 a of the trip latch 75 is in contact with the other end 71 b of the trip lever 71. Further, the trip bar 73 is biased by the elastic restoring force of the second reset spring 74, and the other end 75 b of the trip latch 75 contacts the flat portion 78 b of the semicircular portion 78 in the trip bar 73. Therefore, the trip lever 71 is biased counterclockwise by the second reset spring 74 and the third reset spring 76 in addition to the first reset spring 72.

Next, the state of the contact abutment start moment in the circuit breaker 1A will be described. The state of the circuit breaker 1A shown in FIG. 15 is the state at the contact contact start instant. The state shown in FIG. 15 is only the engagement pin 51 rotated about the lever axis 36 from the state shown in FIG. 14 due to the shape of the arc portion 77 formed on the trip lever 71. The positional relationship between the trip lever 71, the trip bar 73 and the trip latch 75 that are configured does not change. Here, as the shape characteristic of the arc portion 77, the arc centering on the lever axis 36 and the arc portion 77 of the trip lever 71 are assumed to be concentric, but they may not be arcs.

Next, a state where the maximum closing position in the circuit breaker 1A has been reached will be described. In the state shown in FIG. 16, the engagement pin 51 is positioned above the circular arc portion 77 of the trip lever 71, and the contact state between the circular arc portion 77 of the trip lever 71 and the engagement pin 51 ends. The lever 71 and the engagement pin 51 are not in contact with each other. Since the trip lever 71 is biased counterclockwise, it momentarily comes into non-contact with the engagement pin 51 and then rotates counterclockwise to contact the engagement pin 51 again.

When the trip lever 71 rotates counterclockwise from the state shown in FIG. 16, the other end 71b of the trip lever 71 moves rearward. Therefore, one end 75a of the trip latch 75 in contact with the other end 71b of the trip lever 71 moves rearward, and the trip latch 75 rotates counterclockwise around the trip latch axial center 82. Since the trip latch 75 is biased counterclockwise by the elastic restoring force of the third reset spring 76, the state in which the one end 75 a of the trip latch 75 is in contact with the other end 71 b of the trip lever 71 is maintained. Be done.

The counterclockwise rotation of the trip latch 75 causes the other end 75b of the trip latch 75 to move away from the semicircular portion 78 formed on the trip bar 73, as shown in FIG. The state of contact between the semicircular portion 78 and the flat portion 78b is released. Therefore, as shown in FIG. 17, the tripping bar 73 is rotated clockwise by the elastic restoring force of the second reset spring 74, and the arc portion 78 a of the semicircular portion 78 formed on the tripping bar 73 is the trip latch 75. It becomes a position facing the other end 75b and engages with the other end 75b.

Next, the change from the state of reaching the maximum closing position in the circuit breaker 1A to the state of reaching the closing completion position will be described. When energization of the electromagnetic solenoid 20 is completed after the iron core plunger 23 reaches the maximum input position, the drive to the transmission mechanism 30 by the electromagnetic solenoid 20 is released, and the pressing of the movable contact 11 to the fixed contact 10 is released. . Therefore, as in the case of the circuit breaker 1, the reaction force of the contact pressure spring 8 acts between the fixed contact 10 and the movable contact 11, and the iron core plunger 23 moves downward from the maximum closing position shown in FIG. To start.

When the iron core plunger 23 moves downward from the maximum insertion position, the engagement pin 51 moves counterclockwise centering on the lever axis 36 along with counterclockwise rotation of the lever 32 centering on the lever axis 36 Do. Therefore, as shown in FIG. 18, the engagement pin 51 is engaged with the engagement surface 79 formed in the recess 71c of the trip lever 71, and reaches the closing completion position of the circuit breaker 1A, thereby breaking the circuit. The closing operation of the container 1A is completed. In the example described above, the engagement pin 51 has been described as an example of the engagement portion engaged with the trip lever 52, but the engagement portion engaged with the trip lever 52 is not limited to the engagement pin 51, Any shape that can engage with the trip lever 52 may be used.

The circular arc portion 78a of the semicircular portion 78 in the trip bar 73 engages with the other end 75b of the trip latch 75 when it is in the maximum closing position as described above. Rotation is regulated.

Therefore, although the force based on the reaction force of the contact pressure spring 8 trying to rotate the trip lever 71 counterclockwise with respect to the trip lever axial center 80 through the engagement pin 51 is acting on the trip lever 71. As shown in FIG. 18, the rotation is restricted by the trip latch 75 whose rotation in the counterclockwise direction is restricted by the arc portion 78a of the semicircular portion 78.

Next, the tripping operation in the circuit breaker 1A will be described. When the circuit breaker 1A is in the state of the closing completion position shown in FIG. 18 and a tripping command is given to the circuit breaker 1A from the outside, the tripping bar 73 is counterclockwise by an unshown actuator provided on the circuit breaker 1A. It is driven to be rotated around.

The counterclockwise rotation of the trip bar 73 changes the contact position of the arc portion 78a of the semicircular portion 78 of the trip bar 73 with the trip latch 75 from the arc portion 78a of the semicircular portion 78 to the flat portion 78b. 75 can be rotated clockwise. Therefore, the force based on the reaction force of the contact pressure spring 8 causes the trip lever 71 to rotate clockwise about the trip lever shaft center 80 and reverse to the operation of the tripping mechanism 70 from the cutoff state to the maximum closing state. An operation is performed to return to the shutoff state shown in FIGS. Thus, the tripping of the circuit breaker 1A is completed.

As described above, the tripping mechanism 70 of the circuit breaker 1A according to the second embodiment includes the trip lever 71, the trip bar 73, and the trip latch 75. The trip lever 71 is rotatably attached to the housing 2 in a state of being biased in the direction toward the engagement pin 51, and in a state of being in contact with the engagement pin 51 in the charging process of shifting from the blocking state to the charging state. And engages with the engagement pin 51 in the inserted state to restrict the rotation of the lever 32 about the lever axis 36. The trip latch 75 is rotatably supported at its midway portion by the housing 2, and one end 75 a contacts the trip lever 71. The trip bar 73 is formed with a circular arc portion 78 a and a flat portion 78 b, and includes a semicircular portion 78 that rotates around a trip latch axial center 82 fixed to the housing 2. The trip latch axis 82 is an example of a third axis. The other end 75b of the trip latch 75 is in contact with the flat portion 78b of the semicircular portion 78 in the closed state to be restricted in rotation, and is in contact with the arc portion 78a of the semicircular portion 78 in the closed state to be restricted in rotation . Thus, the tripping mechanism 70 can easily adjust the movable amount of the trip lever 71 in the direction away from the engagement pin 51 simply by rotating the trip bar 73.

In the

circuit breakers

1 and 1A, the rotational direction of the lever 32 from the blocking state position to the maximum closing position is not limited to counterclockwise rotation around the lever axis 36. The

circuit breakers

1 and 1A may be a mechanism that turns clockwise by adding an appropriate link member between the connection link 31 and the lever 32.

Further, the

circuit breakers

1 and 1A may not be configured such that the engagement pins 51 slide on the

arc portions

56 and 77 of the trip levers 52 and 71 around the lever axis 36 of the lever 32. That is, in the

circuit breakers

1 and 1A, the shape of the sliding portion of the trip levers 52 and 71 and the engagement pin 51 may not be an arc shape.

Further, the

circuit breakers

1, 1A stop the rotation of the trip levers 52, 71 by the contact between the trip levers 52, 71 and the engagement pin 51, but stop by providing a rotation stopper dedicated to the trip levers 52, 71. It may be configured to

In the first and second embodiments described above, the tripping

bar

54, 73 is operated to rotate counterclockwise by an actuator (not shown), but the tripping

bar

54, 73 is a link or not shown manually. It may be operated to rotate counterclockwise.

Further, in the first and second embodiments described above, the load side terminal 4 and the movable contact 11 are electrically connected by the flexible conductor 5, but the configuration in which the load side terminal 4 and the movable contact 11 are connected is , And may not be the flexible conductor 5. For example, the mover 6, the connection pin 13, and the mover holder 7 may be conductors, and the load-side terminal 4 and the holder axis 12 a may be electrically connected by a slip ring or a conductive brush.

Further, the open electrode spring 40 may be configured by two or more springs, and the configuration of the contact pressure spring 8 may also be configured by two or more springs with respect to the mover 6.

Moreover, although the

circuit breakers

1 and 1A are the structure which the toggle mechanism comprised with the lever 32 and the insulation bar 33 does not reach a dead center, it is not limited to this structure.

Circuit breakers

1 and 1A are mechanisms that can be pulled out even if the toggle mechanism reaches dead point or more when the advancing position of iron core plunger 23 reaches the maximum closing position, for example, lever axis 36 and holder axis The feed mechanism may be configured without changing the basic performance of the

circuit breakers

1 and 1A by adding a configuration in which 12a is set as a movable rotation center.

Further, in the

circuit breakers

1 and 1A, the iron core plunger 23 can be displaced only in the vertical direction, but the movement direction of the iron core plunger 23 is not limited to the vertical direction, and may be oblique. It may change along the way.

The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

1, 1A circuit breaker, 2 case, 2a wall, 3 power supply side terminal, 4 load side terminal, 5 flexible conductor, 5a, 6a, 7a, 31a, 32a, 52a, 54a, 71a, 72a, 73a, 75a one end, 5b, 6b, 7b, 31b, 32b, 52b, 71b, 72b, 73b, the other end, 6 mover, 7 mover holder, 7c, 72c middle portion, 8 contact spring, 9 Mover stopper, 10 fixed contacts, 11 moveable contacts, 12 holder shaft, 12a holder shaft, 13, 34, 35, 38 connection pins, 20 electromagnetic solenoids, 21 yokes, 22 closing coils, 23 iron core plungers, 24 protrusions , 25 gap, 30 transmission mechanism, 31 connection link, 32 lever, 33 insulating bar, 36 lever axis, 37 lever shaft, 3 b Flat portion, 40 opening spring, 50, 70 tripping mechanism, 51 engagement pin, 52, 71 trip lever, 52c, 71c recess, 53, 72 first reset spring, 54, 73 tripbar, 55, 74 Second reset spring, 56, 77 arc portion, 57, 79 engagement surface, 58, 78 half circle portion, 58a, 78a arc portion, 58b, 78b flat portion, 59 engagement portion, 60, 80 trip lever shaft center 61, 81 trip bar axis, 75 trip latch, 75 c central part, 76 third reset spring, 82 trip latch axis.

Claims

And
A fixed terminal attached to the fixed contact and fixed to the housing;
A mover holder rotatably coupled to the housing so as to be rotatable about a first axis fixed to the housing;
A mover rotatably coupled to the mover holder and having a movable contact attached thereto;
A contact pressure spring which applies pressure to the fixed contact and the movable contact when the fixed contact contacts the movable contact;
An electromagnetic solenoid having a linearly moving plunger;
A transfer mechanism for moving the mover along with the movement of the plunger to change from a blocking state in which the movable contact is separated from the fixed contact to a closing state in which the movable contact is in contact with the fixed contact for energization; ,
And a tripping mechanism that engages with the transmission mechanism to hold the input state and releases the engagement with the transmission mechanism to release the holding of the input state.
The transmission mechanism is
A lever that rotates about a second axis fixed to the housing along with the movement of the plunger;
An insulating bar rotatably connected at one end to the one end of the lever and at the other end rotatably connected to the mover;
The plunger is
A first position is reached where the movement of the plunger is limited before the toggle mechanism consisting of the lever and the insulating bar reaches dead center,
The tripping mechanism is
The circuit breaker is engaged with the transmission mechanism in a state where the plunger is retracted after reaching the first position and in the second position to hold the closed state.
An engaging portion attached to the other end of the lever;
The tripping mechanism is
It is rotatably attached to the housing in a state of being biased in a direction toward the engaging portion, and maintains a state of being in contact with the engaging portion in the charging process of transitioning from the blocking state to the closing state A trip lever engaged with the engagement portion in a state where the plunger is in the second position to restrict rotation of the lever about the second axis;
The circuit breaker according to claim 1, further comprising: a trip bar for restricting rotation of the trip lever and releasing the restriction.
The trip lever is
An arc portion having an arc shape centered on the second axis, the arc portion being movably contacting the engagement portion in the closing process;
The circuit breaker according to claim 2, further comprising: a recess that engages with the engaging portion in the inserted state.
The trip bar is
An arc part and a flat part are formed, comprising a semicircular part rotating about a third axis fixed to the housing,
The trip lever is
It is characterized in that the rotation is restricted by coming into contact with the flat part of the semicircular part in the cut-off state, and the rotation is restricted by coming into contact with the arc part of the semicircular part in the put-on state. Circuit breaker as described in.
The tripping mechanism is
It has a trip latch rotatably supported on the housing at a midway portion and having one end portion in contact with the trip lever,
The trip bar is
An arc part and a flat part are formed, comprising a semicircular part rotating about a third axis fixed to the housing,
The other end of the trip latch is
It is characterized in that the rotation is restricted by coming into contact with the flat part of the semicircular part in the cut-off state, and the rotation is restricted by coming into contact with the arc part of the semicircular part in the put-on state. Circuit breaker as described in.