JP5217020B2 - Circuit breaker switching mechanism - Google Patents

Description

The present invention relates to a circuit breaker, and more particularly to an open / close mechanism of a circuit breaker provided with a manual control button used for a low piezoelectric path.

A structural example of a conventional circuit breaker is shown in FIGS. 6, 10 and 21 are terminal plates, 11 and 12 are contacts, 13 is a movable contact plate, 14 is an engagement piece, 15 is a bimetal, 16 is a press plate, 17 is a link, 18 is a handle, 19 is a crossbar, Reference numeral 20 denotes a lead wire, which has an elastic movable contact plate 13 that constantly biases the movable contact 12 by its own force or other force, an engagement piece 14, a presser plate 16, a link 17, a handle 18, and not shown. An open / close mechanism composed of a frame or the like presses against the opening biasing force in the contact closing direction to close or close the contact, or releases the pressing force to release the contact force by the movable contact plate itself or by other force. It has a structure that separates the contacts.

Reference numeral 19 denotes a crossbar, which links the above-mentioned mechanism and the movable contact plate. In particular, the open and closed states of a single mechanism are simultaneously and electrically insulated by two independent movable contact plates. For the purpose of transmission, it is mounted in a sliding guide groove formed on the base that slides only in the vertical direction of FIG. 6 and prevents movement in the other directions.

More specifically, when the mechanism is working in the direction of closing the contacts, the crossbar abutting portion 1602 of the presser plate 16 presses the upper center of the crossbar 19 and the crossbar 19 has two movable contacts. The contact is moved by moving in the direction in which both the plates 13 and 13 are pressed evenly.

On the other hand, when the mechanism is working in the direction of releasing the contact, the pressing restraint at the center upper part of the crossbar 19 of the crossbar abutting portion 1602 of the presser plate 16 is released, and the movable contact plate 13 by self force or other force, The contact force is released by lifting both the crossbar 19 and the crossbar contact portion 1602 by the opening force of 13.

There are two cases where the above-mentioned contacts are separated. One is an operation from on to off by a manual handle, and the other is trip-off due to an abnormal current from the normal on time.

In the case of trip-off, the current to be interrupted is a large current such as overcurrent or short-circuit current, and the contact of one of the two poles may be welded at the beginning of opening due to overheating caused by the arc generated at the time of interruption. is there.

Therefore, as shown in FIG. 5, the cross bar 19 extends from between the two movable contact plates 13 and 13 to the back side 1302 of the cross bar main body 1902 mounting surface 1301 of the movable contact plate and spreads outward. If one of the contact points is welded and difficult to separate, the opening force of the other contact acts on the welded contact side via the crossbar having the engaging claws. Consideration is made so that welding does not occur.
Japanese Patent Laid-Open No. 6-236729 FIG. 4 and FIG.

However, in the circuit breaker having such a structure, in particular, the crossbar, which forms the main part of the circuit breaker in conjunction with the switching mechanism, is not held by the frame holding the link or the like, but is slid on the base. The structure is mounted in the dynamic guide groove, and the movable contact plate, crossbar, and switching mechanism are all inconsistent. As a result, the assembly performance when manufacturing circuit breakers is poor, leading to a reduction in production yield. There was a problem.

For example, when assembling the circuit breaker, the movable contact plate is placed on the base while the movable contact plate is hooked on the engaging claw 1901 provided on the cross bar 19 and the cross bar 19 is slid. The frame, which is arranged on the guide portion and holds the link or the like in that state, is arranged at a predetermined position of the base, and is assembled so that the movable contact plate and the frame are screwed to the base.

In this case, since the movable contact plate is only inserted into the engaging claw that is open on one side of the crossbar, the movable contact plate is not attached when the movable contact plate is attached to the base. It is easy to come off from the crossbar, and it is necessary to place the movable contact plate, the crossbar, and the frame holding the link etc. on the base at the same time. It was not excellent and the work required skill.

In addition, the movable contact plate urges the crossbar in the opening direction at all times due to its elasticity, so that it exerts an urging force in the direction to remove the crossbar and frame from the base, making assembly workability difficult. Met.

Therefore, the present invention has been made in view of such problems, and the assembly work is performed while making the most of the open / close mechanism of the conventional circuit breaker as much as possible without impairing the effect of preventing contact welding by the engaging claws. It is an object of the present invention to provide a circuit breaker switching mechanism that can greatly improve the performance and improve the yield during production.

In order to achieve the above object, according to the first aspect of the present invention, in a circuit breaker interposed in an electric circuit and for supplying, energizing and interrupting a current, a container comprising a case and a cover constituting the outer periphery of the circuit breaker And a first and second manual control button type operation member for projecting a part of the body and performing a current application operation and an interruption operation, and interlocking with the operation member by operating the operation member An open / close mechanism that forcibly contacts and separates the fixed contact and the movable contact, and operates the operation member that constitutes the open / close mechanism to turn on and off the circuit breaker. A rotating member that is rotatably disposed between the rotating member and a link member that is connected to the rotating member by a link and that operates in conjunction with a rotating operation of the rotating member via the link; , An operating plate with which a part of the latch member is engaged, Supporting the movable contact, and a cross bar that the movable contact is biased in a direction separates from the fixed contact at all times the elastic member, provided to be supported on the shaped support substantially U Rutotomoni, the latch The point of action of the member on the crossbar, the point of action of the elastic member on the crossbar, and the support part of the elastic member by the support are arranged on substantially the same straight line, and in the opened state of the movable contact, The cross bar is held by the elastic member in a state of being pressed against the support body, and provides an open / close mechanism for a circuit breaker.

According to such a configuration, the rotating contact member, the latch member, the operation plate, the crossbar, and the like that constitute the opening / closing mechanism are supported by the support member, so that the movable contact plate is supported by the support member during assembly. Provided is a circuit breaker switching mechanism that can be placed on the base in a state of being hooked on the engaging claws of the crossbar supported by the base, reducing the complexity of assembly work and improving the yield. be able to.

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In addition , when the contacts are separated, the crossbar can be driven by transmitting the pressing force of the latch part and the elastic force of the elastic member most efficiently, and when the external force is unexpectedly applied when the support is assembled. However, it is possible to avoid detachment and disassembly of the assembled parts.

In addition, a winding spring is used as the elastic member , and an engagement portion that engages with the inside of the winding spring is provided on the support, and the crossbar of the crossbar pressed by the winding spring operates. May be formed by providing a locking portion that restricts the movement in the vertical direction.

According to such a configuration, the mounting ease of the elastic member, can be improved both out difficulty from the support of the crossbar is pressed against the elastic member at the same time, further improve the assembly workability It is possible to improve the production yield .

The circuit breaker may be a two-pole circuit breaker.

According to such a configuration, the assembly workability of the two-pole circuit breaker, which has been complicated in the conventional assembly, can be greatly improved, and the production yield can be improved.

According to the present invention, the assembly workability can be improved while making the most of the open / close mechanism of the conventional circuit breaker as much as possible without impairing the effect of preventing contact welding by the engaging claws provided in the cross bar provided in the circuit breaker. It is possible to provide a circuit breaker switching mechanism that can be significantly improved and that can improve the yield during production.

Hereinafter, a circuit breaker according to a first embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2 are perspective views showing an opening / closing mechanism portion of a circuit breaker according to the present invention. The opening / closing mechanism 100 is configured to turn on, energize, and interrupt a current in an electric circuit including a circuit breaker by driving the opening / closing mechanism.

The opening / closing mechanism 100 is unitized by using a support body 107 formed in a substantially U-shape that supports each component constituting the opening / closing mechanism at a predetermined position.

The components constituting the opening / closing mechanism 100 include a circuit that is pressed by the operation member by operating a manual control button type operation member partially projecting outside the body constituting the outline of the circuit breaker. A rotating member 102 rotatably disposed between an on-state (current input, energization) and an off-state (current interruption) of the circuit breaker, and connected by the rotating member and the link 103; A latch member 104 that operates in conjunction with the pivoting operation of the pivoting member 102 via the link 103; an actuating plate 105 provided with an engaging portion with which a part of the latch member 104 engages; , A cross bar 106 is provided which supports the movable contact and is always urged by an elastic member 108 in a direction in which the movable contact is separated from the fixed contact.

The operation member 101, the link 103, the latch member 104, and the operating plate 105 are pivotally supported by holes a provided at predetermined positions of the support body 107 with axes a to d, and are supported rotatably. Has been.

Further, the support 107 is provided with a guide hole having a meandering shape so as to restrict the movement trajectory of the link 103 and the latch member 104. When the operation member 101 is operated, the movement of the link 103 and the latch member 104 along the guide hole is restricted by the shaft c provided so as to penetrate each other. For example, the operation member is moved in the ON direction of the circuit breaker. When operated, the rotating member rotates counterclockwise in the figure, and the latch member 104 operates to push down the cross bar 106.

Next, each component will be described.

First, the operation member will be described with reference to FIG. The operation member includes a first operation member 21 and a second operation member 22, and the first operation member 21 turns the circuit breaker on, and the second operation member 22 turns the circuit breaker off. Let me.

The first operating member 21 is covered from above in the figure so as to be locked to a locking portion 1022 with the first operating member provided on the rotating member 102. And the operation part of the 1st operation part 21 is arrange | positioned so that the hole provided in case 1b of the container which comprises the outline of a circuit breaker may be penetrated. The first operating member 21 is provided with a guide groove in which the locking portion slides and a cavity is provided so as to escape the movement locus of the rotating member. When the operating member 21 is pushed down from the outside, The operation member 21 is driven so as to cover the rotation member 102.

The second operation member 22 is provided on the cover 1b. The second operating member 22 has a contact portion 22a in the figure with a winding spring 23 passing through it, and is always urged toward the outside of the cover 1b by the winding spring 23. Further, the second operation member 22 is provided with a retaining member 22b that is hooked on the cover 1b and plays a role of retaining.

When the second operation member 22 is pushed down with the circuit breaker turned on, the abutting portion 22a abuts on the rotating member 102 and rotates the rotating member in the clockwise direction in FIG. Drive the instrument off.

That is, the first operating member 21 drives the rotating member 102 counterclockwise in the figure, and the second operating member 22 drives the rotating member 102 clockwise in the figure.

The point of action of the latch member 104 on the crossbar 106, the point of action of the elastic body 108 on the crossbar, and the support portion of the elastic body 108 by the support 107 are arranged on substantially the same straight line. When the cross bar 106 is pushed down by the latch member 104 and the cross bar 106 is pushed up by the elastic body 108, the direction of the push down and the component force with respect to the push up direction are arranged to be minimized. The force in the push-down direction and the force in the push-up direction by the elastic body 108 are efficiently transmitted and driven.

As the elastic body 108, a winding spring is used, and the support 107 is provided with an engaging portion 1071 that engages with the inside of the winding spring, and the crossbar 106 pressed against the winding spring. A locking portion 1072 is provided to restrict movement in a direction perpendicular to the direction in which the cross bar 106 operates.

The operation plate 105 is pivotally supported by a shaft d in the figure, and is always urged in a direction (left direction in the figure) in which engagement with the latch member 104 is performed by a winding spring provided in the shaft portion. ing. When the tripping operation is performed by a tripping device (for example, an electromagnetic tripping device or a trip coil) provided in the circuit breaker in the on state, The engagement with the end of the latch portion 104 is released, the contact is released, and the state shifts to the off state. At this time, the shaft c in the figure connecting the latch member 104 and the link 103 is restricted in movement along the meandering guide hole provided in the support body 107, and when moving from the on state to the off state, While moving in the middle-up direction, it moves so as to slide in a direction (left direction in the figure) in which the engagement portion between the operating plate 105 and the latch member 104 is reduced. This is because, as will be described later, the engagement with the operation plate 105 is more reliably performed when the state is shifted to the OFF state.

When an abnormal current is generated in the electric circuit and the circuit breaker itself interrupts the current, when the circuit breaker shifts from the on state to the off state, the latch member 104 and the operation plate 105 are temporarily engaged. However, in the off state, it is necessary to engage (reset) again in preparation for the transition to the on state. As described above, since the operating plate 105 is always urged in the direction in which the engagement is made by the winding spring, the latch member 104 needs to be reset against the urging force of the operating plate 105. In order to make the reset more reliable, the engagement portion between the operating plate 105 and the latch member 104 is reduced while moving upward in the figure during the transition to the OFF state (see FIG. The shape of the guide hole 1073 of the support is provided so as to slide in the middle left direction), and is configured so as not to receive the biasing force by the winding spring of the operating plate 10 as much as possible. Note that the shape of the guide hole is not limited to a meandering shape, and may be appropriately determined according to the movement of the link shaft, such as an arc shape. For example, it may be configured as a gentle zigzag shape.

Next, the assembly of the circuit breaker will be described with reference to FIG. FIG. 4 shows an exploded perspective view of a circuit breaker as an example of a two-pole earth leakage breaker used in an electric circuit such as a single-phase two-wire system or a single-phase three-wire circuit.

Reference numeral 10 denotes a case of a part of the body constituting the outline of the circuit breaker. The case 10 has a load-side electric circuit configured to include a terminal 203 attached with a contact constituting an electric circuit, which will be described later, an opening / closing mechanism 100, and a thermal element 202 that acts on the opening / closing mechanism 100 to detach the opening / closing mechanism. Various parts constituting the circuit breaker are attached.

The load-side electric circuit includes a movable contact plate 201 that is elastically provided with a movable contact attached thereto, a bimetal 202 that is a thermal element electrically connected to the movable contact plate 201, and an electric power to the bimetal 202. The lead wire 2021 that constitutes the load side conductor connected to the lead wire 202, and the load side terminal 204 that is electrically connected to the lead wire 2021.

Further, since this circuit breaker is a leakage breaker, the lead wire is passed through a zero-phase current transformer (ZCT) 205 that detects a leakage current. Further, the output signal from the ZCT 205 is processed to determine whether or not a leakage current having a predetermined magnitude has occurred in the electric circuit. When a leakage current having a predetermined magnitude has occurred, a trip means described later is provided. A detection circuit 207 for applying a voltage to the trip coil 206 and driving the trip coil is provided.

These load side electric circuit and detection circuit are previously unitized.

First, the power supply side terminal 203 provided with the fixed contact is disposed on the case 10. Subsequently, a trip coil 206 that is driven by the detection circuit 207 and acts on the above-described operation plate to detach the opening / closing mechanism when a leakage occurs is disposed.

Subsequently, the movable contact plate 201 provided with the movable contact is inserted into the engagement claw 1061 provided on the cross bar of the unitized opening / closing mechanism so as to be sandwiched from both sides of the opening / closing mechanism, and the bimetal 202 is moved to the operation plate. Assembled so as to be closer to the power supply side than 105, and arranged in the case 10 in that state. Then, the support 107 is screwed with the screw 11 from below the case, and the bimetal 202 and the movable contact plate 201 are screwed with the screw 12 from above the case to complete the attachment of various components to the case.

In conventional circuit breakers, the movable contact plate, the crossbar, and the frame that holds the link, etc. are provided separately, and it is necessary to place them on the base at the same time. Although this circuit breaker was difficult, it was only necessary to combine the unitized switching mechanism and load side circuit in the case, which greatly improved the assembly workability and improved the production yield. Improvements can be made.

The trip coil and detection circuit are electrically connected separately. Then, attach the cover to the case and complete the circuit breaker assembly.

In addition, the circuit breaker switching mechanism is configured as a unit, which has the accompanying effect that the size of the switching mechanism in the direction of the power supply-load side can be made more compact than in the past. A circuit breaker can be provided. In addition, in order to maintain compatibility with conventional circuit breaker dimensions, a high-performance circuit breaker can be built by incorporating an additional function such as a leakage alarm device, an overvoltage detection device, or a break alarm device in the empty space inside the device body. Can be provided.

As described above, the circuit breaker switching mechanism of the present invention is configured by unitizing the parts necessary for switching as much as possible, so that the assembly workability is greatly improved while utilizing the conventional circuit breaker switching mechanism as much as possible. It is possible to provide a circuit breaker switching mechanism that can be improved and can improve the yield during production.

It is the figure which showed the switching mechanism of the circuit breaker of this invention. It is the figure which looked at the switching mechanism of the circuit breaker of the present invention from the lower part. It is the figure which showed the switching mechanism, cover, etc. of the circuit breaker of this invention. It is an assembly drawing using the switching mechanism of the circuit breaker of the present invention. It is a figure explaining background art. It is a figure explaining background art.

DESCRIPTION OF SYMBOLS 1 Container 1a Case 1b Cover 21 1st operation member 22 2nd operation member 22a Contact part 22b Retaining member 23 Winding spring 100 Opening-closing mechanism 101 Operation member 102 Turning member 1021 Energizing spring 1022 of a rotation member 1st Locking part 103 Link 104 Latching member 105 Actuating plate 106 Cross bar 107 Support 1071 Engaging part 1072 Locking part 1073 Guide hole 108 Winding spring 201 Movable contact plate 202 Bimetal 203 Power supply side terminal 204 Load side terminal 205 Zero Phase Current Transformer 206 Trip Coil 207 Detection Circuit 11 Screw 12 Screw

Claims (3)

In a circuit breaker that intervenes in an electric circuit and supplies current, energizes, and interrupts it.
A container comprising a case and a cover constituting the outline of the circuit breaker;
A first and second manual control button type operation member partially projecting out of the vessel body for performing a current input operation and a cut-off operation;
An open / close mechanism that operates in conjunction with the operation member by operating the operation member and forcibly contacts and separates the fixed contact and the movable contact, and constitutes the open / close mechanism.
A rotating member disposed in the container so as to be rotatable between an on state and an off state of the circuit breaker by operating the operation member;
A latch member connected to the rotating member by a link, and operating in conjunction with a rotating operation of the rotating member via the link;
An actuating plate with which a portion of the latch member engages;
A cross bar that supports the movable contact and is constantly biased by an elastic member in a direction in which the movable contact is separated from the fixed contact;
Rutotomoni provided is supported on the shaped support substantially U,
A point of action of the latch member on the crossbar;
The point of action of the elastic member on the crossbar;
And the support portion of the elastic member by the support body is arranged on substantially the same straight line,
In the open state of the movable contact, the crossbar is
An opening / closing mechanism for a circuit breaker, which is held in a state of being pressed against the support by the elastic member .
A winding spring is used as the elastic member , and an engaging portion that engages the inside of the winding spring is provided on the support, and the direction in which the cross bar of the cross bar pressed by the winding spring operates 2. The circuit breaker switching mechanism according to claim 1 , wherein a locking portion for restricting movement in a vertical direction is provided.
3. The circuit breaker switching mechanism according to claim 2, wherein the circuit breaker is a two-pole circuit breaker.

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