JPWO2019077754A1 - Breaker - Google Patents

Abstract

The circuit breaker (1) includes a transmission mechanism (30) for moving the mover (6) in accordance with the movement of the plunger (23) of the electromagnetic solenoid (20) to change from a cut-off state to a closed state, and a tripping mechanism. (50). The plunger (23) is in a first position where the movement of the plunger (23) is restricted before the toggle mechanism including the lever (32) of the transmission mechanism (30) and the insulating bar (33) becomes a dead center. To reach. The tripping mechanism (50) engages with the transmission mechanism (30) in a state where the plunger (23) is retracted after reaching the first position and is at the second position, and holds the closed state.

Description

  The present invention relates to a structure of a circuit breaker for bringing a movable contact into contact with a fixed contact or separating the movable contact from the fixed contact.

  Conventionally, as a circuit breaker using an electromagnetic solenoid as a closing mechanism, a circuit breaker of a type that maintains a closed state by applying a current to the electromagnetic solenoid even after closing is mainly developed. However, it is difficult to save energy with a circuit breaker that applies current to the electromagnetic solenoid even in the closed state, and deterioration of the closed coil occurs because current continues to flow through the closed coil that constitutes the solenoid. There was a problem that it was easy.

  Therefore, in the circuit breaker described in Patent Literature 1, after the completion of closing, a tripping mechanism is used to hold the closing state, and at the time of breaking, the tripping mechanism is operated to open the circuit breaker and release the closing state. Is being developed.

JP-A-6-84433

  However, in the circuit breaker described in Patent Document 1, there are many components constituting a link mechanism that operates when the circuit breaker opens. As a result, many components operate in conjunction with each other, exhibiting complex behavior.In addition, if the components are used for a long period of time, the components may be damaged or the mechanical characteristics may change over time. May be reduced.

  Further, the circuit breaker described in Patent Literature 1 shows a characteristic that the mechanical load rises to the right from the interrupted state to the closed state, and the mechanical load in the closed state is the largest. Therefore, it is necessary to arrange a plurality of links to increase the reduction ratio and reduce the trip load, and it is necessary to accommodate a complicated mechanism for increasing the reduction ratio in a limited arrangement area, and to assemble the device. Getting worse.

  The present invention has been made in view of the above, and an object of the present invention is to provide a circuit breaker that can reduce a load on a tripping mechanism, reduce the size of the tripping mechanism, and improve assemblability. I do.

  In order to solve the above problems and achieve the object, a circuit breaker according to the present invention includes a housing, a fixed terminal to which fixed contacts are attached and fixed to the housing, and a first shaft center fixed to the housing. A mover holder rotatably connected to the housing, a mover rotatably connected to the mover holder and having a movable contact attached thereto, and a fixed contact and a movable contact when the fixed contact and the movable contact come into contact with each other. A contact pressure spring for applying pressure to the contact, an electromagnetic solenoid having a plunger that moves linearly, and a movable contact that moves the movable element with the movement of the plunger, and the movable contact is separated from the fixed contact by a movable contact. A transmission mechanism that changes to a closed state in which a contact is made with a fixed contact, and engages with the transmission mechanism to maintain the closed state, and releases the engagement with the transmission mechanism to release the closed state. A trip mechanism. The transmission mechanism is connected to a lever that rotates around a second axis fixed to the housing with movement of the plunger, and one end is rotatably connected to one end of the lever, and the other end is rotatable by the mover. And an insulating bar connected to the second member. The plunger of the electromagnetic solenoid reaches the first position where the movement of the plunger is restricted before the toggle mechanism including the lever and the insulating bar becomes a dead center. The tripping mechanism retracts after the plunger reaches the first position and engages with the transmission mechanism in a state in which the plunger is at the second position to maintain the closed state.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the load to a tripping mechanism can be reduced, and the size reduction of a tripping mechanism and the improvement of assemblability can be aimed at.

Sectional drawing which shows the example of a structure of the circuit breaker concerning Embodiment 1. Enlarged view of the tripping mechanism shown in FIG. FIG. 2 is a configuration diagram illustrating a circuit breaker according to the first embodiment in a cut-off state; Enlarged view of the tripping mechanism shown in FIG. FIG. 2 is a configuration diagram showing a state at the moment when the contact of the circuit breaker according to the first embodiment is started. Enlarged view of the tripping mechanism shown in FIG. FIG. 2 is a configuration diagram illustrating a state where the circuit breaker according to the first embodiment has reached a maximum closing position. Enlarged view of the tripping mechanism shown in FIG. Enlarged view of the tripping mechanism after the trip lever rotates from the state shown in FIG. FIG. 2 is a configuration diagram showing a state where the circuit breaker according to the first embodiment has reached the closing completion position. Enlarged view of the tripping mechanism shown in FIG. FIG. 4 is a diagram illustrating a relationship between a movement position of an iron core plunger and a load applied to an electromagnetic solenoid according to the first embodiment. FIG. 4 is a configuration diagram showing a circuit breaker according to the second embodiment in a cut-off state; Enlarged view of the tripping mechanism shown in FIG. FIG. 9 is a configuration diagram showing a state of a tripping mechanism in a state at the moment when contact abutment of the circuit breaker according to the second embodiment is started. FIG. 9 is a configuration diagram showing a state of a tripping mechanism when the circuit breaker according to the second embodiment has reached a maximum closing position. FIG. 9 is a configuration diagram showing a state of a tripping mechanism when the circuit breaker according to the second embodiment has reached a maximum closing position. FIG. 9 is a configuration diagram showing a state of a tripping mechanism when the circuit breaker according to the second embodiment has reached a closing completion position.

  Hereinafter, a circuit breaker according to an embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by the embodiment.

Embodiment 1 FIG.
The circuit breaker according to the first embodiment is an aerial circuit breaker that opens and closes an electric circuit such as a low-voltage distribution line, and detects at least one of an overcurrent and a leak to cut off the electric circuit. In the following, for convenience of explanation, the Z-axis positive direction is set to the upper side, the Z-axis negative direction is set to the lower side, the X-axis positive direction is set to the right, the X-axis negative direction is set to the left, and the Y-axis positive direction is set to the front, The Y-axis negative direction is the rear. In the following, clockwise and counterclockwise mean clockwise and counterclockwise in the drawings described later.

  FIG. 1 is a diagram illustrating a configuration example of the circuit breaker according to the first embodiment of the present invention. As shown in FIG. 1, a circuit breaker 1 according to a first embodiment includes a housing 2 formed of an insulating member, and a power supply side attached to the housing 2 through a wall 2 a of the housing 2. A terminal 3 and a load-side terminal 4, and a flexible conductor 5 having one end 5 a connected to the load-side terminal 4 inside the housing 2. In the circuit breaker 1, a movable element 6 having one end 6 a connected to the other end 5 b of the flexible conductor 5 and one end 7 a is rotatably attached to the housing 2 inside the housing 2. The movable member holder 7 includes 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.

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

  The flexible conductor 5 is a conductor having flexibility, and one end 5 a is connected to the load 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 when the movable contact 11 contacts the fixed contact 10, the circuit breaker 1 electrically connects the power supply terminal 3 and the load terminal 4 to each other. Is connected to the power-on state. When the movable contact 11 is separated from the fixed contact 10, the circuit breaker 1 enters a cutoff state in which the power supply terminal 3 and the load terminal 4 are electrically cut off.

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

  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 6a of the mover 6 is in contact with the mover stopper 9 in the state shown in FIG. For this reason, rotation of the other end 6 b of the mover 6 in a direction away from the other end 7 b of the mover holder 7 is restricted by the mover stopper 9, but the other end 6 b of the mover 6 is It is possible to rotate the holder 7 in a direction approaching the other end 7b.

  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 in a state in which the contact pressure spring 8 is charged shorter than its natural length, and has a predetermined initial contact pressure in advance. Therefore, when the other end 6b of the mover 6 rotates in a direction approaching the other end 7b of the mover holder 7, the distance between the other end 6b of the mover 6 and the other end 7b of the mover holder 7 becomes smaller. As a result, the contact pressure spring 8 is further charged.

  Further, the circuit breaker 1 transmits an electromagnetic solenoid 20 disposed inside the housing 2 as a closing actuator of the circuit breaker 1 and a driving force of the electromagnetic solenoid 20 to the mover 6, and the fixed contact of the movable contact 11. A transmission mechanism 30 that contacts and separates the transmission mechanism 10, an opening spring 40 having one end and the other end attached to the transmission mechanism 30 and the housing 2, and maintains the closed state and releases the closed state And a trip mechanism 50 that performs the operation.

  The electromagnetic solenoid 20 includes a yoke 21 made of a magnetic material, a loading coil 22 wound around a bobbin (not shown) and fixed inside the yoke 21, and an iron core plunger 23 that can reciprocate linearly in a vertical direction. And a protrusion 24 formed on the upper part of the iron 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 core plunger 23 is displaced only in the vertical direction by such a guide. It is possible. It is sufficient that the core plunger 23 and the protruding portion 24 are fixed, and the method of fixing the core plunger 23 and the protruding portion 24 does not matter.

  By energizing the input coil 22, an electromagnetic attraction force is generated in the electromagnetic solenoid 20. Due to the generation of the electromagnetic attraction, the iron core plunger 23 moves upward, and when the gap 25 between the iron core plunger 23 and the inside of the input coil 22 disappears, the movement of the iron core plunger 23 is restricted and the iron plunger 23 is moved. Stops physically. As described above, the position where the iron core plunger 23 stops is the position where the iron core plunger 23 is in the uppermost direction, and is hereinafter described as the maximum insertion position or the maximum movement position. The structure in which the iron core plunger 23 stops is not limited to the above-described example. For example, a configuration may be employed in which a projecting portion is provided below the iron core plunger 23 and is locked to the bobbin or yoke 21 of the input coil 22 so that the iron core plunger 23 physically stops.

  After a certain period of time has elapsed after the position of the iron core plunger 23 has reached the maximum closing position, the electromagnetic solenoid 20 stops generating an electromagnetic attraction force by stopping power supply to the closing 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 closing position due to the own weight of the iron core plunger 23 and the opening force of the opening spring 40, for example.

  The transmission mechanism 30 includes a connecting link 31 having one end 31 a rotatably connected to the protrusion 24 of the electromagnetic solenoid 20, a lever 32 rotatably connected to the other end 31 b of the connecting link 31, and a lever 32. An insulating bar 33 rotatably connected to the one end 32a.

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

  The lever 32 is attached to a lever shaft 37 so as to be rotatable around a lever shaft center 36 whose absolute position is fixed to the housing 2. In the lever 32, a region closer to the release mechanism 50 than the lever shaft 37 is connected to the other end 31 b of the connection link 31 by a connection pin 35. 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.

  One end 33a of the insulating bar 33 is rotatably connected to one end 32a of the lever 32 by a connecting pin 38, and the other end 33b is rotatably mounted to the one end 6a of the mover 6 by the connecting pin 13. . The insulating bar 33 is made of a material having high electrical insulation such as a resin. Therefore, when the circuit breaker 1 is in the energized state, the current flowing between the power supply terminal 3 and the load terminal 4 does not leak through the lever 32. Note that the entirety of the insulating bar 33 does not need to be made of an insulating material, and a part of the insulating bar 33 may be formed of a conductor as long as the connecting pin 13 and the connecting pin 38 are in an insulated state.

  The lever 32 and the insulating bar 33 constitute a toggle mechanism in a four-bar link with the lever axis 36 and the holder axis 12a as fixed rotation centers. Therefore, the transmission mechanism 30 can be driven with a smaller force as the lever shaft center 36, the connection pin 38, and the connection pin 13 approach the dead center 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.

  One end and the other end of the opening spring 40 are attached to the lever 32 and the housing 2 as described above, and the transmission mechanism 30 is moved by the elastic restoring force of the opening spring 40 to a shut-off state position to be described later. It is urged in the direction of displacement.

  As described above, the tripping mechanism 50 has a function of maintaining the closed state and releasing the closed state. FIG. 2 is an enlarged view of the tripping mechanism shown in FIG. In FIG. 2, the housing 2 of the circuit breaker 1 is indicated by a broken line.

  As shown in FIG. 2, the tripping mechanism 50 includes a trip lever 52 that engages with an engagement pin 51 fixed to the other end 32 b of the lever 32, and one end portion of the trip lever 52 and the housing 2. A first reset spring 53 having an end attached thereto. The tripping mechanism 50 includes a trip bar 54 that is rotated by a driving force of an actuator (not shown), a second reset spring 55 having one end and the other end attached to the trip bar 54 and the housing 2. Is provided.

  The engagement pin 51 projects rightward from the lever 32 in a direction perpendicular to the direction in which the lever 32 extends. One end 52a of the trip lever 52 is rotatably mounted around a trip lever axis 60 fixed to the housing 2, and the other end 52b has an arc surface that comes into contact with the engaging pin 51 in the closing process. An arc portion 56 is formed. In the middle of the trip lever 52, a concave portion 52c that is recessed rearward is formed. An engagement surface 57 that engages with the engagement pin 51 in the closed state is formed in the concave portion 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 portion 52 b of the trip lever 52.

  One end 54 a of the trip bar 54 is attached to the housing 2 so as to be rotatable about a trip bar axis 61, and has a semicircular semicircular portion 58 centered on the trip bar axis 61. I have. 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 driving force of the actuator (not shown) causes the semicircular portion 58 to rotate about the trip bar axis 61, and the arc portion 58 a of the semicircular portion 58 engages with the engaging portion 59 formed on one end 52 a of the trip lever 52. By doing so, 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 a direction to rotate the other end 54b of the trip bar 54 facing upward in a direction toward the front centering on the trip bar axis 61. That is, the second reset spring 55 urges the trip bar 54 clockwise.

  The operation of the circuit breaker 1 configured as described above will be specifically described. FIG. 3 is a configuration diagram illustrating a cutoff state of the circuit breaker according to the first embodiment, and FIG. 4 is an enlarged view of the tripping mechanism illustrated in FIG. FIG. 5 is a configuration diagram showing a state at the moment when the contact of the circuit breaker according to the first embodiment starts, and FIG. 6 is an enlarged view of the tripping mechanism shown in FIG. FIG. 7 is a configuration diagram showing a state in which the circuit breaker according to the first embodiment has reached the maximum closing position. FIG. 8 is an enlarged view of the tripping mechanism shown in FIG. 7, and FIG. FIG. 6 is an enlarged view of the tripping mechanism after the trip lever has rotated from the state shown in FIG. FIG. 10 is a configuration diagram illustrating a state where the circuit breaker according to the first embodiment has reached the closing completion position. FIG. 11 is an enlarged view of the tripping mechanism illustrated in FIG. 3 to 11, the casing 2 is indicated by a broken line.

  As shown in FIG. 3, when the circuit breaker 1 is in the cutoff state, the iron core plunger 23 constituting the electromagnetic solenoid 20 reaches the lowermost portion by the opening spring 40 and is in physical contact with the housing 2. You can no longer descend downwards. At this time, the size of the gap 25 is maximum.

  When the core plunger 23 is at the lowermost position, the other end 32b of the lever 32 is located below the one end 32a, and is located at a position facing the one end 52a of the trip lever 52 in the left-right direction. One end 52a 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 contact with the arc portion 56 formed on the one end 52 a of the trip lever 52.

  When the breaker 1 is in the cutoff state, the rotation of the mover 6 in the direction in which the other end 6b of the mover 6 is separated from the other end 7b of the mover holder 7 by the mover stopper 9 of the mover holder 7, that is, Clockwise rotation of the mover 6 is limited. Since the contact pressure spring 8 has a predetermined initial contact pressure as described above, as long as the reaction force from the fixed contact 10 to the movable contact 11 does not exceed the initial contact pressure, One end 6a 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 cutoff state, the separation distance that is the physically shortest distance between the movable contact 11 and the fixed contact 10 of the mover 6 is maximum. In the state shown in FIG. 3, as shown in FIG. 4, the flat portion 58b of the semicircular portion 58 of the trip bar 54 is elastically restored by the second reset spring 55 for rotating the trip bar 54 clockwise. As a result, it is in contact with a corner portion of the engaging portion 59 formed on one end portion 52a of the trip lever 52. Therefore, the rotation of the trip lever 52 is restricted, and the state shown in FIG. 4 is maintained.

  Further, the one end portion 52a of the trip lever 52 is formed into a circular arc portion by the elastic restoring force of the first reset spring 53 that attempts to rotate the trip lever 52 clockwise so that the one end portion 52a of the trip lever 52 moves 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 restricted, and the state shown in FIG. 4 is maintained.

  When power is applied to the closing coil 22 of the electromagnetic solenoid 20 in a state where the circuit breaker 1 is in the cutoff state, the iron core plunger 23 moves upward as shown in FIG. The upward movement of the core plunger 23 causes the lever 32 to rotate about the lever axis 36, and the connection angle between the lever 32 and the insulating bar 33 decreases. The connection angle is an angle formed by the extension direction of the lever 32 and the extension direction of the insulating bar 33, and the connection angle becomes smaller as the circuit breaker 1 changes from the state shown in FIG. 3 to the state shown in FIG.

  As the connection angle decreases, the mover 6 moves forward, and the fixed contact 10 and the movable contact 11 come into 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 terminal 3 and the load terminal 4 through the fixed contact 10, the movable contact 11, and the flexible conductor 5.

  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 is provided with a second reset spring 55 as the connection angle decreases. While maintaining the state of contact with the trip lever 52 to which the elastic restoring force has been applied, the arc portion 56 formed on the other end portion 52b of the trip lever 52 slides.

  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, during the period from the state shown in FIG. 4 to the state shown in FIG. 6, even if the engagement pin 51 moves, the position of the trip lever 52 does not change.

  When the circuit breaker 1 reaches the contact abutment start state, the mover 6 is restricted from rotating clockwise by the mover stopper 9 provided on the mover holder 7, but can be rotated counterclockwise. It is. When the iron core plunger 23 advances further from the contact abutment start state shown in FIG. 6, the contact reaction force from the fixed contact 10 to the movable contact 11 attached to the other end 6b of the mover 6 increases, and The other end 6 b of the armature 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 becomes the maximum closing position due to the upward movement of the iron core plunger 23, the movable contact 11 is moved to the movable member holder 7 by the contact reaction force from the fixed contact 10. The angle of rotation is maximum, and the amount of stored energy of the contact pressure spring 8 is also maximum.

  When the position of the core plunger 23 reaches the maximum closing position, as shown in FIG. 8, the engagement pin 51 that has slid on the arc portion 56 of the trip lever 52 passes through the arc portion 56 of the trip lever 52. To reach the upper part of the engagement surface 57 of the trip lever 52. Therefore, the engagement pin 51 momentarily comes into non-contact with the trip lever 52.

  When the relationship with the engagement pin 51 changes to the non-contact state, the trip lever 52 whose clockwise rotation has been restricted by the engagement pin 51 is released from the restriction of the clockwise rotation. Therefore, as shown in FIG. 9, the concave portion 52 c of the trip lever 52 rotates clockwise by the elastic restoring force of the first reset spring 53 and comes into contact with the engaging pin 51. When the engagement pin 51 comes into contact with the concave portion 52c of the trip lever 52, clockwise rotation of the trip lever 52 is restricted.

  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 rotation in the clockwise direction is restricted by the trip lever 52, becomes a second reset spring 55. 8 and 9, the arc portion 58a of the semicircular portion 58 wraps around 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 restricts the rotation of the trip bar 54 in the state shown in FIGS.

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

  Therefore, the reaction force of the stored contact pressure spring 8 acts between the fixed contact 10 and the movable contact 11, and moves the iron core plunger 23 of the electromagnetic solenoid 20 from the maximum closing position to the shut-off position through the transmission mechanism 30. A force is generated that pushes back in the direction to move to. Further, the force in the direction of moving the iron core plunger 23 from the maximum closing position to the shut-off state is also applied by the own weight of the iron core plunger 23 and the opening force of the opening spring 40. Thus, the iron core plunger 23 starts moving 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 about the lever axis 36. When the lever 32 rotates counterclockwise, the engagement pin 51 rotates counterclockwise about the lever axis 36, and as shown in FIGS. As a result, the core plunger 23 reaches the closing completion position, and the closing operation of the circuit breaker 1 is completed.

  When the core plunger 23 is at the closing position, the arc portion 58a of the semicircular portion 58 engages with the flat portion of the engaging portion 59 formed on the one end 52a of the trip lever 52. In addition, the rotation of the other end 52b of the trip lever 52 forward is restricted.

  Therefore, despite the fact that a force based on the reaction force of the contact pressure spring 8 for rotating the trip lever 52 counterclockwise with respect to the trip lever axis 60 is applied to the trip lever 52 through the engagement pin 51, the trip lever 52 is Does not rotate due to the rotation restriction by the arc portion 58a of the semicircular portion 58, as shown in FIG.

  As described above, when the circuit breaker 1 is in the cut-off state, a constant initial contact pressure is applied to the contact pressure spring 8 in advance, and from the moment when the movable contact 11 starts to contact the fixed contact 10, the fixed contact 10 Is set such that the contact pressure of the movable contact 11 with respect to Therefore, when the circuit breaker 1 is in the energized state, the occurrence of separation between the contacts due to the electromagnetic repulsion generated between the movable contact 11 and the fixed contact 10 is prevented, and a trip command described later is issued. The separation speed between the movable contact 11 and the fixed contact 10, which will be described later, that is, the opening speed can be increased.

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

  Due to the counterclockwise rotation of the trip bar 54, the arc portion 58a of the semicircular portion 58 of the trip bar 54 separates 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. Is done. Therefore, the trip lever 52 rotates counterclockwise around the trip lever axis 60 by the force based on the reaction force of the contact pressure spring 8, and the iron core plunger 23 goes through the state shown in FIG. Return. Thereby, 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 applied to the electromagnetic solenoid 20 will be described. FIG. 12 is a diagram illustrating a relationship between a movement position of the iron core plunger according to the first embodiment and a 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 insertion position shown in FIG.

  Hereinafter, upward movement of the core plunger 23 is referred to as forward movement, and downward movement of the core plunger 23 is referred to as retreat. In addition, the moving position of the core plunger 23 when the core plunger 23 moves forward is described as a forward position, and the moving position of the core plunger 23 when the core plunger 23 retreats is described as a retreat position. Further, a load applied to the electromagnetic solenoid 20 when the iron core plunger 23 moves forward is referred to as a forward load, and a load applied to the electromagnetic solenoid 20 when the iron core plunger 23 moves backward is referred to as a reverse load.

  As shown in FIG. 12, when the forward movement position of the iron core plunger 23 is in the cut-off state position from the cut-off state position to the contact contact start position, the transmission is performed in a state where the fixed contact 10 and the movable contact 11 are not in contact with each other. The mechanism 30 is driven. Therefore, when the forward position of the iron core plunger 23 is in the shut-off state position, the load applied to the electromagnetic solenoid 20 is relatively small. Then, when the forward 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 via the connecting pins 13 and 38 as a counterclockwise load torque around the lever axis 36, and the load applied to the electromagnetic solenoid 20 rapidly increases. growing.

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

  In the mechanism state of the circuit breaker 1 in which the iron core plunger 23 is further advanced and the advanced position is the maximum closing position for the first time after the start of the closing operation, the lever 32 and the insulating bar 33 are brought closer to a straight line. Is the closest to the dead center. Therefore, the component of the reaction force from the contact pressure spring 8 acting on the connecting pin 38 in the direction perpendicular to the straight line connecting the lever axis 36 and the connecting pin 38 approaches zero, and the electromagnetic solenoid 20 necessary for rotating the lever 32 is rotated. Also rapidly approach zero. That is, the load force action is the distance that the iron core plunger 23 of the electromagnetic solenoid 20 moves forward to apply a load torque to the lever 32 in accordance with the throwing power of the electromagnetic solenoid 20 that increases due to the displacement from the shut-off state position to the closed state position. The distance is reduced. Therefore, not only can the electromagnetic attraction force of the electromagnetic solenoid 20 be efficiently used for the closing operation of the circuit breaker 1, but also the electromagnetic solenoid 20 having a size corresponding to the change in the working distance of the load force required for the closing operation of the circuit breaker 1. Can be used, and the size and cost of the electromagnetic solenoid 20 can be reduced. In the circuit breaker 1 according to the first embodiment, the iron core plunger 23 is configured to stop moving forward before the above-described toggle mechanism crosses the dead center. , The configuration of the tripping mechanism 50 can be prevented from becoming complicated.

  In the state after the contact of the circuit breaker 1 with the contact, the contact between the movable contact 11 and the fixed contact 10 generates a contact pressure receiving the reaction force from the contact pressure spring 8. Directional pressing force is generated. When a pressing force against the lever shaft 37 is generated, a friction torque is generated against the lever shaft 37, and a vertical sliding friction load of the electromagnetic solenoid 20 due to a front-rear component of the load transmitted to the electromagnetic solenoid 20 through the connection link 31. Are combined, and the input load of the electromagnetic solenoid 20 is increased as a friction force that cannot be ignored.

  After the core plunger 23 reaches the maximum insertion position, when the moving direction of the core plunger 23 changes to the backward direction, 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 closed state can be reduced by the effect of reducing the tripping load derived from the frictional force.

  As described above, since the load on the tripping mechanism 50 in the closed state can be reduced, the configuration of the tripping mechanism 50 can be simplified. Therefore, the size of the tripping mechanism 50 can be reduced, the size of the circuit breaker 1 can be reduced, and the number of components of the tripping mechanism 50 can be reduced, so that the durability of the tripping mechanism 50 can be reduced. Sex can be raised.

  Until the movable contact 11 comes into contact with the fixed contact 10, a frictional force is generated mainly due to the rotation of the rotating portions of the connecting pins 13, 38, the lever shaft 37, and the connecting pins 34, 35. Therefore, until the movable contact 11 contacts the fixed contact 10, the friction torque on the lever shaft 37 and the vertical sliding friction load of the electromagnetic solenoid 20 are reduced by the contact pressure spring 8 after the contact between the movable contact 11 and the fixed contact 10. Smaller than the state after the contact pressure due to the reaction force from Therefore, as shown in FIG. 12, the difference between the applied load due to the frictional force before contacting the contact and the applied load due to the frictional force after the contacting is smaller than the difference between the applied load due to the frictional force after the contact.

  With respect to a series of closing operation and closing load of the circuit breaker 1, a load characteristic required for closing the electromagnetic solenoid 20 in the circuit breaker 1 can be formulated. For example, by formulating the load characteristics required for turning on the electromagnetic solenoid 20 in each of the states shown in FIGS. 3, 5, 7 and 10, the mechanical load at the time of the trip is greatly reduced by utilizing the mechanical friction. It is possible to design the circuit breaker 1 to reduce the input load characteristic of the electromagnetic solenoid 20 and reduce the hysteresis.

  As described above, the circuit breaker 1 according to the first embodiment includes the housing 2, the power supply side terminal 3, the mover holder 7, the mover 6, the contact pressure spring 8, 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 is fixed to the housing 2 with a fixed contact 10 attached thereto. The mover holder 7 is connected to the housing 2 so as to be rotatable around a holder axis 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 a mover holder 7 and has a movable contact 11 attached thereto. 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 that moves linearly. The iron core plunger 23 is an example of a plunger. The transmission mechanism 30 moves the movable element 6 in accordance with the movement of the iron core plunger 23, and switches the movable contact 11 from the fixed contact 10 to the closed state where the movable contact 11 contacts the fixed contact 10 and energizes the movable contact 11. Change to The tripping mechanism 50 engages with the transmission mechanism 30 to hold the closed state, and releases the engagement with the transmission mechanism 30 to release the held state. The transmission mechanism 30 includes a lever 32 and an insulating bar 33. The lever 32 rotates around a lever axis 36 fixed to the housing 2 as the iron core plunger 23 moves. 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 core plunger 23 of the electromagnetic solenoid 20 reaches the maximum movement position where the movement of the plunger 23 is restricted before the toggle mechanism including the lever 32 and the insulating bar 33 becomes a dead center. Therefore, for example, by setting the maximum movement position of the iron core plunger 23 to a position immediately before the toggle mechanism becomes a dead center, the leverage of the toggle mechanism causes the electromagnetic solenoid 20 necessary for rotating the lever 32 to be turned on. The load can be rapidly reduced to zero. Therefore, the load applied to the tripping mechanism 50 in the closed state can be reduced. The position immediately before the above-mentioned dead center is a position where the dead center is not reached even when there is a manufacturing error. The maximum movement position is an example of a first position. Also, the tripping mechanism 50 engages with the transmission mechanism 30 in a state where the iron core plunger 23 is retracted after reaching the maximum movement position and is at the loading completion position, and holds the loading state. The loading completion position is an example of a second position. Accordingly, when the moving direction of the iron core plunger 23 is changed to the backward direction, the direction of the frictional force applied to the entire transmission mechanism 30 is also changed, so that the effect of reducing the load due to the frictional force, that is, the hysteresis of the input load characteristic is obtained. Thus, the load on the trip mechanism 50 in the closed state can be reduced. Therefore, it is possible to reduce the necessity of making the tripping mechanism of the circuit breaker a complicated mechanism, and it is possible to reduce the size of the tripping mechanism 50 and improve the ease of assembly.

  Further, the circuit breaker 1 includes an engagement pin 51 attached to the other end 32 b of the lever 32. The engagement pin 51 is an example of an engagement portion. The tripping mechanism 50 includes a trip lever 52 and a trip bar 54. The trip lever 52 is rotatably attached to the housing 2 in a state where the trip lever 52 is urged in a direction toward the engagement pin 51, and is in contact with the engagement pin 51 during the closing process of shifting from the blocking state to the closing state. Is maintained, and when the iron core plunger 23 is in the loading completion position, the engagement with the engagement pin 51 restricts the rotation of the lever 32 around the lever axis 36. The trip bar 54 regulates the rotation of the trip lever 52 and releases the regulation. 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 for the engagement pin 51, the tripping mechanism 50 can be reduced in size and improved in assemblability. Can be achieved. Further, since the engagement pin 51 is brought into contact with the trip lever 52 from the shut-off state to the closing state, the tripping operation can be easily performed only by changing the movable amount of the trip lever 52 in the direction away from the engagement pin 51. be able to.

  The trip lever 52 has an arc shape centered on the lever axis 36, and engages with the arc portion 56 with which the engaging pin 51 is movably contacted during the closing process, and with the engaging pin 51 in the closed state. And a recess 51c. Thus, since the position of the trip lever 52 does not change during the closing process, it is possible to suppress the load applied to the electromagnetic solenoid 20 that drives the transmission mechanism 30 from being varied by the trip lever 52 during the closing process.

  The trip lever 52 includes a semicircular portion 58 that is formed with an arc portion 58 a and a flat portion 58 b and that 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 shut-off state and is restricted from rotating. The trip lever 52 contacts the arc portion 58a of the semicircular portion 58 in the closed state and restricts the rotation. Accordingly, the amount of movement of the trip lever 52 in the direction away from the engagement pin 51 can be easily adjusted only by rotating the trip lever 52.

Embodiment 2 FIG.
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 those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. The following description focuses on differences from circuit breaker 1 of the first embodiment.

  FIG. 13 is a configuration diagram showing a breaking 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 breaking diagram according to the second embodiment. It is a block diagram showing the state of the tripping mechanism in the state at the moment of contact start of the container. 16 and 17 are configuration diagrams illustrating a state of a trip mechanism when the circuit breaker according to the second embodiment has reached the maximum closing position. FIG. 18 is a diagram illustrating the state of the circuit breaker according to the second embodiment. FIG. 4 is a configuration diagram illustrating a state of a tripping mechanism when the state has reached a loading completion position. 13 to 18, the housing 2 is indicated by a broken line.

  As shown in FIG. 13, a circuit breaker 1A according to Embodiment 2 includes a housing 2, a power supply terminal 3, a load 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 opening spring 40, and a tripping mechanism 70.

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

  The trip lever 71 is attached to the housing 2 so as to be rotatable about a trip lever axis 80. At one end 71a of the trip lever 71, an arc portion 77 that comes into contact with the engaging pin 51 in the closing process is formed. Have been. The other end 71 b of the trip lever 71 projects forward and faces the trip latch 75. A recess 71c that is recessed rearward is formed in the middle of the trip lever 71. An engagement surface 79 that engages with the engagement pin 51 is formed in the concave portion 71c. The first reset spring 72 urges the trip lever 71 counterclockwise about the trip lever axis 80.

  One end 73 a of the trip bar 73 is attached to the housing 2 so as to be rotatable about the trip bar axis 81, and has a semi-circular semi-circular portion 78 about the trip bar axis 81. I have. The second reset spring 74 urges the other end 73b of the trip bar 73 clockwise about the trip bar axis 81. The trip bar 73 rotates around the trip bar axis 81 by the driving force of an actuator (not shown).

  The trip latch 75 is formed in an L-shape when viewed from the side, and a central portion 75c is rotatably attached to the housing 2 about a trip latch axis 82. The third reset spring 76 urges the trip latch 75 counterclockwise about the trip latch axis 82.

  The state of the circuit breaker 1A shown in FIG. 14 is a cutoff state. 14, the trip lever 71 is urged counterclockwise by the elastic restoring force of the first reset spring 72. Therefore, the state where the arc portion 77 formed in front of the one end portion 71 a of the trip lever 71 is in contact with the engagement pin 51 is maintained.

  Further, the trip latch 75 is urged 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. Also, the trip bar 73 is urged by the elastic restoring force of the second reset spring 74, and the other end 75b of the trip latch 75 contacts the flat portion 78b of the semicircular portion 78 of 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 circuit breaker 1A at the moment when contact abutment is started will be described. The state of the circuit breaker 1A shown in FIG. 15 is a state at the moment when contact abutment starts. In the state shown in FIG. 15, the shape of the arc portion 77 formed on the trip lever 71 causes only the engagement pin 51 to rotate about the lever axis 36 from the state shown in FIG. 14. The positional relationship between the trip lever 71, the trip bar 73, and the trip latch 75 is not changed. Here, as the shape characteristics of the arc portion 77, it is assumed that the arc centered on the lever axis 36 and the arc portion 77 of the trip lever 71 are concentric, but they may not be arcs.

  Next, a state in which the circuit breaker 1A has reached the maximum closing position will be described. In the state shown in FIG. 16, the engagement pin 51 is located above the arc portion 77 of the trip lever 71, and the contact state between the arc portion 77 of the trip lever 71 and the engagement pin 51 ends, so that the trip occurs instantaneously. The lever 71 and the engaging pin 51 are brought into a non-contact state. Since the trip lever 71 is urged counterclockwise, the trip lever 71 momentarily comes into non-contact with the engagement pin 51, then rotates counterclockwise and comes into contact with 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, the one end 75a of the trip latch 75 that is in contact with the other end 71b of the trip lever 71 moves rearward, and the trip latch 75 rotates counterclockwise about the trip latch shaft 82. Since the trip latch 75 is urged counterclockwise by the elastic restoring force of the third reset spring 76, the state where one end 75a of the trip latch 75 is in contact with the other end 71b of the trip lever 71 is maintained. Is 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. Is released from the contact with the flat portion 78b of the semicircular portion 78. Therefore, as shown in FIG. 17, the trip 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 trip bar 73 is moved by the trip latch 75. It is located at a position facing the other end 75b and engages with the other end 75b.

  Next, a description will be given of a change from a state where the circuit breaker 1A has reached the maximum closing position to a state where it has reached the closing completion position. When the power supply to the electromagnetic solenoid 20 is completed after the iron core plunger 23 has reached the maximum closing position, the drive of the electromagnetic solenoid 20 to the transmission mechanism 30 is released, and the pressing of the movable contact 11 to the fixed contact 10 is released. . Therefore, similarly to 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 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 closing position, the engagement pin 51 moves counterclockwise about the lever axis 36 with the counterclockwise rotation of the lever 32 about the lever axis 36. I do. Therefore, as shown in FIG. 18, the engagement pin 51 is engaged with the engagement surface 79 formed in the concave portion 71c of the trip lever 71, and reaches the closing completion position of the circuit breaker 1A. The closing operation of the container 1A is completed. In the above-described example, the engaging pin 51 is described as an example of the engaging portion that engages with the trip lever 52. However, the engaging portion that engages with the trip lever 52 is not limited to the engaging pin 51. Any shape that can be engaged with the trip lever 52 may be used.

  As described above, the arc portion 78a of the semicircular portion 78 of the trip bar 73 is engaged with the other end portion 75b of the trip latch 75 when it reaches the maximum closing position. Rotation is regulated.

  Therefore, despite the fact that a force based on the reaction force of the contact pressure spring 8 for rotating the trip lever 71 counterclockwise with respect to the trip lever shaft center 80 acts on the trip lever 71 through the engagement pin 51, 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 closing completion position shown in FIG. 18, when a trip command is given to the circuit breaker 1A from the outside, the trip bar 73 is turned counterclockwise by an actuator (not shown) provided in the circuit breaker 1A. It is driven to rotate around.

  By the counterclockwise rotation of the trip bar 73, the contact position of the arc portion 78a of the semicircular portion 78 of the trip bar 73 with the trip latch 75 changes from the arc portion 78a of the semicircular portion 78 to the flat portion 78b. 75 can rotate clockwise. Therefore, the trip lever 71 rotates clockwise around the trip lever axis 80 by the force based on the reaction force of the contact pressure spring 8, and the operation of the tripping mechanism 70 from the shut-off state to the maximum closing state is reversed. The operation is performed, and the operation returns to the cutoff state shown in FIGS. Thereby, 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 where the trip lever 71 is urged in a direction toward the engaging pin 51, and is in contact with the engaging pin 51 during a closing process of shifting from a blocking state to a closing state. In the closed state, the lever 32 engages with the engagement pin 51 to restrict the rotation of the lever 32 around the lever axis 36. The trip latch 75 is rotatably supported at an intermediate portion by the housing 2, and one end 75 a contacts the trip lever 71. The trip bar 73 includes a semicircular portion 78 formed with an arc portion 78 a and a flat portion 78 b and rotating around a trip latch axis 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 restricted in rotation by contacting the flat portion 78b of the semicircular portion 78 in the cut-off state, and is restricted by contacting the arc portion 78a of the semicircular portion 78 in the closed state. . Thus, the tripping mechanism 70 can easily adjust the amount of movement 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 rotation direction of the lever 32 from the interrupted state position to the maximum closing position is not limited to the counterclockwise direction around the lever axis 36. The circuit breakers 1 and 1 </ b> A may be a mechanism that is turned 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 have a configuration in which the engagement pin 51 slides on the arc portions 56 and 77 of the trip levers 52 and 71 about the lever axis 36 of the lever 32. That is, in the circuit breakers 1 and 1A, the shape of the sliding portion between the trip levers 52 and 71 and the engagement pin 51 may not be an arc shape.

  The circuit breakers 1 and 1A stop the rotation of the trip levers 52 and 71 when the trip pins 52 and 71 come into contact with the engagement pins 51. It is good also as a structure to make it.

  In the first and second embodiments described above, the trip bars 54 and 73 are operated by the actuator (not shown) so as to rotate in the counterclockwise direction. It may be operated to rotate counterclockwise.

  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. The flexible conductor 5 may not be used. For example, the configuration may be such that the mover 6, the connecting pin 13, and the mover holder 7 are conductors, and the load-side terminal 4 and the holder axis 12a are electrically connected by a slip ring or a conductive brush.

  Further, the opening spring 40 may be configured by two or more springs, and the configuration of the contact pressure spring 8 may be configured by two or more springs for the movable element 6.

  Further, the circuit breakers 1 and 1A have a configuration in which the toggle mechanism including the lever 32 and the insulating bar 33 does not reach the dead center, but is not limited to such a configuration. When the forward position of the iron core plunger 23 reaches the maximum closing position, the circuit breaker 1, 1A can be released even if the toggle mechanism reaches after the dead center, for example, the lever shaft 36 and the holder shaft. By adding a configuration in which 12a is used as a movable rotation center, the closing mechanism may be configured without changing the basic performance of the circuit breakers 1 and 1A.

  In the circuit breakers 1 and 1A, the iron core plunger 23 can be displaced only in the vertical direction. However, the moving direction of the iron core plunger 23 is not limited to the vertical direction, and may be an oblique direction. It may change on the way.

  The configurations described in the above embodiments are merely examples of the contents of the present invention, and can be combined with other known technologies, and can be combined with other known technologies without departing from the gist of the present invention. It is also possible to omit or change the part.

  1, 1A circuit breaker, 2 housing, 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, 54b, 71b, 72b, 73b, 75b The other end, 6 mover, 7 mover holder, 7c, 72c Midway, 8 contact pressure spring, 9 Movator stopper, 10 fixed contacts, 11 movable contacts, 12 holder shaft, 12a holder shaft center, 13, 34, 35, 38 connecting pin, 20 electromagnetic solenoid, 21 yoke, 22 input coil, 23 iron plunger, 24 protrusion , 25 gap, 30 transmission mechanism, 31 connecting link, 32 lever, 33 insulating bar, 36 lever axis, 37 lever axis, 38b flat part, 40 open Pole spring, 50, 70 tripping mechanism, 51 engagement pin, 52, 71 trip lever, 52c, 71c recess, 53, 72 first reset spring, 54, 73 trip bar, 55, 74 second reset spring, 56,77 arc portion, 57,79 engagement surface, 58,78 semicircle portion, 58a, 78a arc portion, 58b, 78b flat portion, 59 engagement portion, 60,80 trip lever axis, 61,81 trip bar Axis, 75 trip latch, 75c center, 76 third reset spring, 82 trip latch axis.

Claims (5)

A housing;
A fixed terminal to which a fixed contact is attached and fixed to the housing;
A mover holder coupled to the housing so as to be rotatable around a first axis fixed to the housing;
A mover rotatably connected to the mover holder and having a movable contact attached thereto,
A contact pressure spring that applies pressure to the fixed contact and the movable contact at the time of contact between the fixed contact and the movable contact,
An electromagnetic solenoid having a plunger that moves linearly;
A transmission mechanism for moving the mover with the movement of the plunger to change from a cut-off state in which the movable contact is separated from the fixed contact to a closed state in which the movable contact comes into contact with the fixed contact and is energized; ,
A trip mechanism that engages with the transmission mechanism to hold the closed state, and releases the engagement with the transmission mechanism to release the held state.
The transmission mechanism,
A lever that rotates around a second axis fixed to the housing with movement of the plunger;
An insulating bar having one end rotatably connected to one end of the lever and the other end rotatably connected to the mover,
The plunger is
Before the toggle mechanism including the lever and the insulating bar reaches the dead center, reaches the first position where the movement of the plunger is restricted,
The trip mechanism is
The circuit breaker, wherein the plunger retreats after reaching the first position and engages with the transmission mechanism in a state where the plunger is at the second position to maintain the closed state. An engaging portion attached to the other end of the lever,
The trip mechanism is
It is rotatably attached to the housing in a state where it is biased in the direction toward the engaging portion, and maintains a state in contact with the engaging portion in a closing process of shifting from the blocking state to the closing state. A trip lever that engages with the engagement portion in a state where the plunger is in the second position to restrict rotation of the lever around the second axis;
The circuit breaker according to claim 1, further comprising: a trip bar that regulates rotation of the trip lever and releases the regulation. The trip lever is
An arc portion having an arc shape centered on the second axis, wherein the engagement portion is movably contacted in the closing process;
The circuit breaker according to claim 2, further comprising: a concave portion that engages with the engaging portion in the closed state. The trip bar is
An arc portion and a flat portion are formed, and a semi-circular portion that rotates around a third axis fixed to the housing;
The trip lever is
The rotation is regulated by contacting the flat portion of the semicircular portion in the shut-off state, and the rotation is regulated by contacting the arc portion of the semicircular portion in the closed state. The circuit breaker according to the above. The trip mechanism is
An intermediate portion is rotatably supported by the housing, and includes a trip latch having one end contacting the trip lever,
The trip bar is
An arc portion and a flat portion are formed, and a semi-circular portion that rotates around a third axis fixed to the housing;
The other end of the trip latch is
The rotation is regulated by contacting the flat portion of the semicircular portion in the blocking state, and the rotation is regulated by contacting the arc portion of the semicircular portion in the closed state. The circuit breaker according to the above.

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