JP4155171B2 - Circuit breaker - Google Patents

Description

  According to the present invention, when an excessive current flows through the energizing circuit, the second iron core is attracted to the first iron core, and the tripping member is driven in a direction to release from the locked state with the latch member to forcibly open the contact. The present invention relates to a circuit breaker.

  As this type of circuit breaker, there is one disclosed in Patent Document 1. When this is described with reference to the reference numerals in the literature, the latch member 43 connected to the handle 6 via the link 44 and the torsion spring 60 are biased in the direction of locking one end side of the latch member 43. A tripping member 41 that is rotatably supported in the container, and a rotation operation of the handle 6 in a state in which one end side of the latch member 43 that is rotatably supported in the container is engaged with the tripping member 41 is rotated. A crossbar 40 that moves, a contact that opens and closes with the rotation of the crossbar 40, and an energization circuit to the contact are configured, and the tripping member 41 is sandwiched between the crossbar 40 and the crossbar 40. The bimetal 45 arranged, a U-shaped fixed iron core (first iron core) 74 arranged so as to surround a part of the bimetal 45, and the fixed iron core 74 are connected to each other via a leaf spring 73. Movable iron core (second If a large current flows through the bimetal 45 when the contact is closed, the movable iron core 58 is attracted to the fixed iron core 74 and driven to release the tripping member 41 from the latched state with the latch member 43. And an electromagnet device 47.

  The second tripping member 42 rotates when the second bimetal 46 and the second movable iron core 58 arranged in parallel to the bimetal 45 are sucked by the second fixed iron core 74 and the tripping member 41. To forcibly open the contacts.

In this case, the cross bar 40 and the electromagnet device 47 are disposed so as to sandwich the tripping member 41, so that there is a problem that the space cannot be saved and the internal space cannot be used effectively. In addition to the spring 60 for biasing the tripping member 41, a spring for biasing the movable iron core 58 to the return position is necessary, and the manufacturing work is difficult.
JP 2001-35342 A

  The present invention has been made in view of such a reason, and the object of the present invention is to save space, to effectively use the internal space, to reduce the number of parts, and to facilitate the manufacturing work. It is in providing the circuit breaker which becomes.

The circuit breaker according to the present invention includes a container, a handle rotatably supported by the container, a latch member connected to the handle via a link, and a part of the latch member. A tripping member biased in the direction and supported rotatably in the container, and a part of the latch member supported rotatably in the container and locked in the tripping member. A first magnetic body disposed so as to surround a part of a current path to the contact, a crossbar that is rotated by a rotation operation of the handle, a contact that opens and closes as the crossbar rotates. And a second magnetic body, and when a large current flows through the energizing circuit when the contact is closed, the second magnetic body is attracted to the first magnetic body and the tripping member is moved to the latch member. And an electromagnet device that drives in a direction to release from the locked state. In the breaker,
The first magnetic body is provided on the crossbar, and the second magnetic body is provided on the tripping member.

  In the above configuration, the rotational direction in which the tripping member is released from the latched state is the same as the rotational direction of the crossbar that opens the contact.

  In the above configuration, a bimetal whose free end side is displaced by an overcurrent is interposed in the energizing circuit, and the bimetal is a side surface opposite to the first magnetic body facing surface side of the second magnetic body, The tripping member is disposed at a position where it comes into contact with the second magnetic body on the free end side that is displaced when it is generated and is driven in a direction to release the latching member from the locked state.

  According to the circuit breaker of the present invention, it is not necessary to dispose the first magnetic body and the second magnetic body separately from the crossbar and the tripping member, space saving can be achieved, and the internal space can be effectively used. Available. Further, since the second magnetic body is provided on the tripping member urged in the latch member locking direction, it is not necessary to attach the first magnetic body to the first magnetic body via a leaf spring as in the conventional example. The number of points can be reduced, and the manufacturing work becomes easy.

  Further, since the rotation direction for releasing the engagement state of the tripping member with the latch member is the same direction as the rotation direction of the crossbar where the contact is opened, the second magnetic body when a large current flows through the contact However, at this time, the contact pressure of the contact is increased by the attraction force, so the contact pressure does not decrease when a large current is generated, and the contact is not easily damaged or welded. Become.

  When the bimetal is displaced by an overcurrent due to the arrangement of the bimetal and the tripping member is driven in a direction to release the latch member from the latched state, the crossbar also rotates in the contact opening direction. A sufficient distance from the second magnetic body can be secured. For this reason, the second magnetic body driven by the free end side of the bimetal does not move until it contacts the first magnetic body, so that the free end side of the bimetal is less likely to be warped, and overcurrent tripping characteristics It becomes difficult to affect.

  An embodiment of the present invention will be described with reference to FIGS. This embodiment shows a two-pole type circuit breaker, and each member of the first pole is also divided into two parts in the first container formed by dividing the second pole. Each member of the second pole is housed in the container and the electrodes are interlocked (not shown), and the same member is housed in the container for each pole.

  In other words, this circuit breaker has a body 6, a handle 9, a latch member 22, a tripping member 24, a crossbar 3, contacts 10 and 11, and an electromagnet device 40.

  The container 6 shows the 1st container divided into two as mentioned above. As shown in the figure, the container 6 has terminals 7 and 8 at both ends, the handle 9 protrudes from the handle hole 30 on the upper surface, and the following parts are accommodated therein.

  The handle 9 is rotatably supported by the container body 6 so that a part of the handle 9 protrudes to the outside. In the embodiment, the handle 9 is supported by the shaft 20 held by the vessel 6.

  The latch member 23 is connected to the handle 9 via the link 21. One end of the link 21 is connected to the handle 9, the middle portion of the latch member 22 is pivotally supported at the other end of the link 21, and the other end is engaged with the pressing portion 3 a of the crossbar 3 at one end 22 a. It is said.

  The tripping member 24 is urged in a direction to lock a part of the latch member 22 and is rotatably supported in the container body 6. The tripping member 24 is pivotally supported on the container body 6 by a shaft 25, and a locking receiving portion 24 a at the upper end locks the locking portion 22 b of the latch member 22. The tripping member 24 is urged by a spring 28 in a direction to be locked to the locking portion 22b.

  The contacts 10 and 11 open and close as the crossbar 3 rotates, and are fixed to the movable contact 2 and the fixed contact 1 in the embodiment. That is, the fixed contact 1 has a fixed contact 10, and the fixed contact 1 is connected to the terminal 8 by being integrally formed on the terminal plate of the terminal 8. The movable contact 2 has a movable contact 11 which is opposed to the fixed contact 10 so as to be able to come into contact with and away from the fixed contact 10. One end of the flexible lead wire 12 is connected to the rear end.

  Here, the arc shielding member 4 is not interposed between the movable contact 11 and the fixed contact 10 when the movable contact 11 contacts the fixed contact 10, and the movable contact 11 and the fixed contact when the movable contact 11 is separated from the fixed contact 10. 10 is interposed. The protrusion 4 a provided at the tip of the arc shielding member 4 is fitted in a fitting recess 14 provided in the partition wall 15 of the vessel body 6. The arc shielding member 4 is supported by a shaft 16, and a gear 17 (one of which is not shown) is provided on the arc shielding member 4 and the crossbar 3, and the arc shielding member 4 is attached to the crossbar 3 by meshing these gears. It is linked.

  The cross bar 3 is rotatably supported in the container 6 and is rotated by a rotation operation of the handle 9 in a state where a part of the latch member 22 is locked to the tripping member 24. The cross bar 3 drives the movable contact 2 by moving the movable contact 11 to and from the fixed contact 10. In the embodiment, a shaft 13 is provided, and the shaft 13 is supported by the vessel body 6. When the crossbar 3 rotates about the shaft 13 counterclockwise, the movable contactor 2 is turned off, and when it is turned clockwise, it is turned on. In this case, the cross bar 3 is urged in the opening direction by the opening spring 23. And the rotation direction which cancels | releases the latching state with the latch member 22 of the trip member 24 is made into the same direction as the rotation direction of the crossbar 3 which the contacts 10 and 11 open. Reference numeral 41 denotes a contact pressure applying spring interposed between the movable contact accommodating portion of the cross bar 3 and the movable contact 2.

  The electromagnet device 40 includes a first magnetic body, for example, a first iron core 43 and a second magnetic body, for example, disposed so as to surround a part of the flexible lead wire 12 that is an energization current path to the contacts 10 and 11. When a large current flows through the flexible lead wire 12 when the contacts 10 and 11 are closed, the second iron core 44 is attracted to the first iron core 43 and the tripping member 4 is latched. It drives in the direction which cancels | releases the latching state with 22. FIG. Here, the first iron core 43 is provided on the cross bar 3, and the second iron core 44 is provided on the tripping member 24. That is, as shown in FIG. 3, both side portions 50, a lower step portion 51, and a pressing portion 52 connected to the both side portions 50 are provided so as to protrude in a direction opposite to the contact side below the shaft 13 of the crossbar 3. 53 is formed. The first iron core 43 is substantially U-shaped, and its intermediate portion 43a is press-fitted into the recess 53 and fixed. At this time, the outer surfaces of the side pieces 43b are pressed against the inner surfaces of the side portions 50, the lower end surface of the intermediate portion 43a is pressed against the lower step portion 51, and both sides 43c of the upper end surface of the intermediate portion 43a are pressed against the pressing portion 52, A central protruding portion 43 d on the upper end surface of the portion 43 a is fitted between the pressing portions 52. A substantially T-shaped mounting protrusion 56 is provided on the surface 55 of the tripping member 24 opposite to the cross bar 3. The second iron core 44 is plate-shaped, and is provided with a claw engaging recess 57 that abuts the surface 55 and engages with the mounting projection 56 on the side edge, and further bends a ring portion 58 that fits the shaft 25. ing. While the second iron core 44 is in contact with the surface 55, the ring portion 58 is passed through the shaft 25, and the locking recess 57 is fitted to the body portion between the head of the mounting projection 56 and the surface 55 and is prevented from being pulled out by the claw. Lock and thus connect together. The second iron core 44 opposes each end of the both side pieces 43b of the first iron core 43, and an energization circuit can be formed between the two side pieces 43b between the second iron core 44 and the first iron core 43. The flexible lead wire 12 passes vertically, the upper side thereof passes above the central protrusion 43d, is connected to the movable contact 2, and the lower side is connected to the free end of the bimetal 26.

  The bimetal 26 is such that the free end side is displaced by an overcurrent, and the bimetal 26 is interposed in the energizing circuit. The bimetal 26 is a side surface opposite to the first core facing surface side of the second iron core 44, and abuts against the second iron core 44 on the free end side that is displaced when an overcurrent is generated, thereby removing the tripping member 24. The latch member 22 is disposed at a position to be driven in a direction of releasing the latched state. The base end of the bimetal 26 is held by the container 6, the free end of the bimetal 26 is connected to the other end of the flexible lead wire 12, and the base end portion of the bimetal 26 and the terminal 7 are connected by a lead wire 27. .

  FIG. 1 shows an on state. The handle 9 falls to the upper surface of the container body 6, the link 21 descends, and the pressing portion 3 a of the crossbar 3 resists the opening spring 23 in a state where the locking portion 22 b of the latch member 22 is locked to the tripping member 24. Then, the cross bar 3 is rotated in the clockwise direction, and the movable contact 2 is turned on to bring the movable contact 11 into contact with the fixed contact 10. At this time, since the link 21 is reversed, the handle 9 is urged in the direction in which the handle 9 is tilted by the spring force of the opening spring 23 and is locked to the edge of the handle hole 30. Thereby, the terminals 7 and 8 are connected through the lead wire 27, the bimetal 26, the flexible lead wire 12, the movable contact 2, and the fixed contact 1, and a current flows through this energization circuit.

  FIG. 2 shows an off state. When the handle 9 is raised from the turned-on state to the off-state, the link 21 is reversed when the handle 9 exceeds a certain rotation position, and the handle 9 is urged in the direction of standing by the spring force of the opening spring 23. The latch member 22 is pulled up by the link 21, and the cross bar 3 is rotated counterclockwise, so that the movable contact 2 is opened and the movable contact 11 is fixed. Move away from contact 10. This opens the energizing circuit. At the same time, the arc shielding member 4 is rotated via the gear 17 by the rotation of the cross bar 3 and enters between the fixed contact 10 and the movable contact 11, and the protrusion 4 a is fitted into the fitting recess 14. When the handle 9 is tilted again, the crossbar 3 rotates clockwise in the state shown in FIG. 1 and the movable contact 2 is closed. At this time, the arc shielding member 4 is fixed via the gear 17 to the fixed contact 1. Rotate to the bottom.

  FIG. 4 shows a tripped state in which an overcurrent flows in the electric circuit in the on state, the bimetal 26 trips the tripping member 24 from the latch member 22, and the handle 26 shows a state before the operation. As a result, the movable contact 11 is forcibly opened from the fixed contact 10. That is, when an overcurrent flows in the electric circuit, the bimetal 26 bends and pushes the second iron core 44 attached to the tripping member 24 at the tip, and the tripping member 24 rotates counterclockwise about the shaft 25. Thus, the latch member 22 is separated from the locking portion 22a, and the latch member 22 is rotated about the link 21 by the cross bar 3 receiving the spring force of the opening spring 23, and the cross bar 3 is rotated counterclockwise. Therefore, the movable contact 2 is opened. Since the first iron core 43 is separated from the second iron core 44 by the rotation of the crossbar 3, the bimetal 26 does not press the second iron core 44 and comes into contact with the first iron core 43, and the bimetal 26 is plastically deformed. Can be prevented. At the same time, the arc shielding member 4 is rotated via the gear 17 to be positioned between the movable contact 11 and the fixed contact 10 and the projection 4a is fitted into the fitting recess 14 as in the case of the above-described OFF operation. To do. Thereby, the arc between the movable contact 11 and the fixed contact 10 can be completely interrupted.

  The reset after the trip is performed when the bimetal 26 is cooled and returned by stopping the current, and the handle 9 is raised to the off side in the state where the tripping member 24 is returned by the spring 28. When an off-side biasing spring is provided on the handle 9, the handle 9 is automatically raised, whereby the link 21 is pulled up, and the tip 22a of the latch member 22 rotates about the pressing portion 3a as a fulcrum, thereby engaging the locking portion 22a. Is pulled up and locked to the tripping member 24. As a result, the off state shown in FIG. 2 is obtained.

  FIG. 5 shows a tripped state in which a short-circuit current larger than the overcurrent flows through the electric circuit in the ON state and the tripping member 24 is pulled off from the latch member 22, and the handle 26 is in a state before operation. When a short-circuit current flows through the energizing circuit, the magnetic flux generated around the flexible lead wire 12 passes through the first iron core 43 and the second iron core 44 and attracts between the first iron core 43 and the second iron core 44. The second iron core 44 is pulled by the first iron core 43 and the tripping member 24 is pulled off from the latch member 22. As a result, the same operation as that of the overcurrent trip operation of FIG. 4 is performed, and the contacts 10 and 11 are forcibly opened. When a suction force is generated between the first iron core 43 and the second iron core 44, the first iron core 43 receives a force in the direction in which it is pulled by the second iron core 44. The contact pressure does not decrease when a large current is generated, damage or welding of the contact is difficult, and arcing can be suppressed.

It is a side view of the state which opened the container of the ON state of one embodiment of this invention. It is a side view of an OFF state. It is a disassembled perspective view of a cross bar, a trip member, and an iron core. It is a side view of an overcurrent trip state. It is a side view of a short circuit current trip state.

Explanation of symbols

3 Crossbar 6 Body 9 Handle 10 Fixed Contact 11 Movable Contact 12 Flexible Lead 21 Link 22 Latch Member 24 Tripping Member 26 Bimetal 40 Electromagnet Device 43 First Iron Core 44 Second Iron Core

Claims (3)

A container body, a handle rotatably supported by the container body, a latch member connected to the handle through a link, and a biasing member that is biased in a direction to lock a part of the latch member. A tripping member that is pivotally supported by the handle, and a pivoting operation of the handle in a state in which a part of the latch member that is pivotally supported in the container is locked to the tripping member. A crossbar, a contact that opens and closes as the crossbar rotates, and a first magnetic body and a second magnetic body that are disposed so as to surround a part of the current path to the contact. When a large current flows through the energizing circuit when the contact is closed, the second magnetic body is attracted to the first magnetic body and the tripping member is released from the locked state with the latch member. In a circuit breaker comprising an electromagnet device driven in a direction,
A circuit breaker characterized in that the first magnetic body is provided on a crossbar and the second magnetic body is provided on the tripping member.   The circuit breaker according to claim 1, wherein a rotation direction for releasing the engagement state of the tripping member with the latch member is the same direction as a rotation direction of the crossbar that opens the contact.   A bimetal whose free end side is displaced by an overcurrent is interposed in the energizing circuit, and the bimetal is a side surface opposite to the first magnetic body facing surface side of the second magnetic body and is displaced when an overcurrent occurs. 3. The circuit breaker according to claim 1, wherein the circuit breaker is disposed at a position where the tripping member is driven in a direction to release the latch member from the locked state by contacting the second magnetic body on the free end side.

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