JPH088047B2 - Circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit breaker that is interposed between a power source and a load and that cuts off power supply to the load when a load abnormality is detected.

BACKGROUND ART In general, a circuit breaker of this type, which is interposed between a power source and a load and cuts off power supply to the load when a load abnormality is detected, is
A plurality of circuit breaker main bodies are housed in the same housing, and the breaking operation at the time of abnormality detection of each circuit breaker main body is interlocked. 4 to 13 show a conventional example of this type of circuit breaker, in which the left and right covers
A pair of circuit breaker main bodies A are housed side by side on both sides of the housing main body 1c in a housing 1 formed by 1a, 1b, a housing main body 1c and a crimping pin 1d. It is designed to work together. The handle 2 arranged on the upper surface of the housing 1 has a connector 21 which is rotatably supported by a handle shaft 20 projecting from the frame 3.
And an engaging portion with which the connector 21 of both circuit breaker main bodies A is engaged.
A common handle for both circuit breaker main bodies A, which is formed by a handle main body 22 having 22a formed at one end and an operating portion 22b formed at the other end, and an auxiliary spring 23 that facilitates driving the handle 2 to the off side. The handle 2 is rotatable about the handle shaft 20 by a predetermined angle. The handle 2 has the breaking contact in the off position when the operating portion 22b projects from the housing 1, and the breaking contact in the on position when the handle 22b is housed in the recess on the upper surface of the housing 1.

The movable contactor 5 connected to the handle 2 via the trip link 4 is formed as a latch part having one end fixed by a latch mechanism 6, and the center part is connected to the handle 2 via the trip link 4. The movable contactor main body 5a and a rotary shaft 50 provided at the other end of the movable contactor main body 5a have a central portion pivotally supported and a movable contact 7 at the tip, and a base portion abuts against the movable contactor main body 5a. And a movable contact piece 5b that is prevented from rotating in one direction by contacting a portion (which is also used as the leg portion 40b of the U-shaped connecting fitting 40 in the embodiment).

Here, the trip link 4 is one leg of the U-shaped connecting fitting 40 that connects the handle 2 and the movable contactor main body 5a.
40a is inserted into the shaft hole 41 of the handle 2, and the other leg 40b is inserted into the shaft hole 43 of the central part of the movable contact body 5a through the guide hole 42 formed in the frame 3 to move the handle 2 and the handle 2. The leg portions 40a, 40b, which are the connecting shafts with the contactor 5, and the handle shaft 20, which supports the handle 2, are arranged in a toggle manner, and a reversing force is applied to the movable contactor body 5a by an urging spring 11 described later. Has been done. Further, the latch mechanism 6 for fixing one end of the movable contactor 5 is a rotary shaft projectingly provided on the frame 3.
A latch piece 61 rotatably supported by 60 and provided with an engagement groove 62, and a coil spring for biasing the latch piece 61 in the latch direction.
The engaging bar 62, which is formed by 63 and is engaged with the engaging groove 62 of the latch piece 61, is engaged and fixed by engaging the engaging bar 52 which constitutes the latch portion at one end of the movable contact body 5a.

Further, in the fixed contact terminal 9 having the fixed contact 8 provided at one end and the terminal screw 90 for wire connection and the holding metal fitting 91 provided at the other end, the fixed contact 8 faces the movable contact 7, and the terminal screw 90 Terminal block formed on one side of the housing 1
It is arranged so as to be located at 92, and the fixed contact 8 and the movable contact 7 can be opened and closed by the rotation of the movable contact 5. An arc extinguishing chamber in which an arc extinguishing plate 70 is arranged is provided on the side of the breaking contact composed of the movable contact 7 and the fixed contact 8 so that the arc when the breaking contact is opened can be quickly extinguished. Has become. Further, the movable contact terminal 95 provided with the terminal screw 96 and the pressing metal 97 and electrically connected to the movable contact piece 5a through the braided wire 94 and the exciting coil 100 is arranged on the terminal block 98 provided on the other side of the housing 1. Has been done. A U-shaped insulating cover 99 formed of a synthetic resin having elasticity is attached to each of the terminal blocks 92 and 98, and the insulating cover 99 is provided on the lower portion of the inner side surface so as to project. The engaging projections 99a on the side surfaces of the terminal blocks 92, 98.
By engaging with a, it is attached without using screws, and a check hole 99b into which a tester rod for insulation check is inserted is provided on the upper surface.

Furthermore, the auxiliary contact block 13 for obtaining the auxiliary contact output that is switched in conjunction with the breaking contact is provided on the auxiliary terminal block 72 on which the auxiliary contact terminal 71 is provided and on the back surface of the auxiliary terminal block 72. The small limit switch 73 and a boss projecting on the inner surface of the housing 1 are inserted into the shaft support hole 74a in the central portion to be rotatably supported and interlocked with the movable contact 5 so that the small limit switch 73 Interlocking arm that pushes the push button
74 and the auxiliary contact block 13 is fitted in the opening 75 of the housing 1.

On the other hand, the latch mechanism 6 responds to the load current when an abnormality is detected.
The anomaly detection mechanism 10 that drives in the unlatching direction is such that the exciting coil 100 through which the load current flows, and the fixed iron core and the movable iron core that are fitted in the exciting coil 100 face each other in the oil via the return spring. An oil dash pot 101 adapted to obtain an appropriate delay excitation characteristic, a yoke 102 formed integrally with the frame 3, a suction piece 103a at both ends, and a latch engagement piece 103b engaged with a latch piece 61, respectively. Is formed, and the central portion is formed by a driving metal fitting 103 pivotally supported by a rotary shaft 105 protruding from the frame 3 and a coil spring 104 for biasing the driving metal fitting 103 in a direction opposite to the suction direction. When the load current of a predetermined value or more flows, the suction piece 103a of the drive fitting 103 is attracted to the oil dash pot 101 to rotate the drive fitting 103, and the latch engagement piece 103b releases the latch piece 61. It is designed to drive in the direction.

By the way, the urging spring 11 for urging the base portion of the movable contact piece 5b in the direction in which the rotation is blocked includes an engaging piece 30 projecting from the frame 3 and an engaging piece provided on the movable contact piece 5b. It is interposed between the spring 51 and 51, and the contact pressure is obtained by the elastic return force of the biasing spring 11 and the reversing force of the trip link 6 is obtained. In this case, since the movable contact 7 is arranged on the surface of the movable contact piece 5b on the rotatable direction side, the contact pressure by the biasing spring 11 is applied to the breaking contact.

On the other hand, in the interlocking breaking mechanism 15 for interlocking the breaking operation of the circuit breaker main body A arranged in parallel, an engaging projection 82 for engaging with the contact breaking mechanism of the circuit breaker main body A is projectingly provided on one end face. It is composed of a pair of ring-shaped synthetic resin coupling bodies 83 and shaft projections 81 projecting at opposite positions on both sides of the partition wall 16 of the housing body 1c for partitioning each storage part, and an inner hole of the coupling body 83. 83a is fitted into the shaft protrusion 81 to rotatably support both connecting bodies 83, a connecting pin 84 is projectingly provided on the other end surface of one connecting body 83, and connected to the other end surface of the other connecting body 83. A pin insertion hole 85 into which the pin 84 is inserted is bored, and an arcuate hole 86 is provided on the side of the shaft projection 81 so that the connecting pin 84 is movably inserted and closed by the ring-shaped portion of the connecting body 83. In the embodiment, each connecting body 83 is formed with a connecting pin 84 and a pin insertion hole 85. 83 is quite made the same shape.

Here, the engaging projection 82 of the connecting body 83 is
Is arranged so as to come into contact with the upper surface of the bent portion of the movable contact 5 so that it can be pushed down by the end of the movable contact 5 on the latch side when the movable contact 5 enters the trip state (state shown in FIG. 13). It has become. Therefore, when one of the circuit breaker main bodies A is in a trip state, the connecting body 83 rotates and the drive fitting 103 of the other circuit breaker main body A is forcibly rotated counterclockwise. The latching mechanism 6 releases the movable contact 5 from the latch, and the breaking contact is forcibly turned off.

Further, the slider 24, which is movably provided in the recess 25 on the bottom surface of the housing 1 for mounting and holding the circuit breaker on the terminal rail, automatically returns the slider body 26 and the slider body 26 to the inside. The return spring 27 is constructed by inserting a contact portion 27a formed at one end of a coiled spring into a locking groove formed in the recess 25 of the housing 1 and locking the spring 27. Is locked and fixed to the housing 1, and the slider body 26 is provided with an inward returning force by a return spring 27.

The operation of the embodiment will be described below with reference to FIGS. 11 to 13. FIG. 11 shows a case where the movable contact 7 and the fixed contact 8 are opened and the breaking contact is turned off with the handle 2 in the off position. In this state, the biasing spring 11 contracts. The movable contact 5 is pulled up, and the locking bar 52 of the movable contact 5 is engaged with the engaging groove 62 of the latch piece 61 of the latch mechanism 6. At this time, the interlocking arm 74
Is in a free state and the push button of the limit switch 73 is not pressed, so an auxiliary contact output indicating that the breaking contact is in the off state is output.

Next, as shown in FIG. 12, by rotating the handle 2 to set it from the off position to the on position, the movable contact 5 whose one end is latched by the latch mechanism 6 is locked by the locking bar.
It shows a case in which the movable contact 7 and the fixed contact 8 are elastically contacted with each other by turning about 52 to turn on the breaking contact. When the handle 2 is turned on, the handle shaft 2 and the both legs 40a, 40b of the interlocking metal fitting 40, which is the interlocking shaft, are set to 1
It is rotated while pulling out the urging spring 11 against the urging force of the urging spring 11 up to the dead point where it becomes a straight line, and after the dead point, it is automatically rotated by the urging force of the urging spring 11. The leg portion 40b of the coupling member 40 is rotated until it reaches the vicinity of the lower end of the guide hole 42 and is set to a predetermined ON position, and a reversing operation like a so-called toggle switch is performed. At this time, the movable contactor body 5a is in a state in which upward movement is prohibited at the lower end of the guide hole 42, and moreover, the base of the movable contact piece 5b is prevented from rotating by the biasing spring 11. Since it is biased, a clockwise rotational moment is applied to the movable contact piece 5b. Therefore, as shown in FIG. 12, the contact pressure by the biasing spring 11 is obtained at the position where the movable contact comes into contact with the fixed contact 8. At this time, the interlocking arm 74
Since one end of the switch is pushed down by the movable contactor 5, the interlocking arm 74 rotates, the push button of the limit switch 73 is pressed by the other end, and an auxiliary contact output indicating that the breaking contact is on is output. Will be done.

Next, Fig. 13 shows a large load current and an abnormality detection mechanism.
10 shows a state immediately after the movable contact 5 is released from the latch by the latch mechanism 6 and the movable contact 5 is in the trip state. When a large load current flows through the exciting coil 100, the oil dash By the pot 101, the suction piece 103a of the drive fitting 103 is delayed and sucked to the right, and the drive fitting 103
Rotates counterclockwise and pushes the lower end of the latch piece 61 leftward with the engagement piece 103b. By this pressing, the latch piece 61 rotates clockwise, the latch bar 52 of the movable contact main body 5a is released from the latch by the engagement groove 62, and the movable contact 5 has the interlocking metal fitting.
By rotating counterclockwise about the leg 40b of 40, the movable contact 7 is separated from the fixed contact 8 and the breaking contact is turned off. At this time, at the same time, the latch-side end of the movable contact 5 pushes down the engaging projection 82 of the connecting body 83 of the interlocking breaking mechanism 15, and the breaking contact of the other circuit breaker body A is turned off. . Subsequently, the movable contact 5 is pulled up along the guide hole 42 by the biasing spring 11, the locking bar 52 of the movable contact 5 engages with the engaging groove 62 of the latch piece 61, and at the same time the handle 2 is attached. The biasing force of the biasing spring 11 and the auxiliary spring 23 automatically returns to the off position, and the state shown in FIG. 11 is obtained. In addition, when supplying power to the load again, handle 2
Should be set to the ON state shown in FIG.

By the way, in such a conventional example, one of the circuit breaker main bodies A performs a breaking operation to engage the engaging projection 82 of the one connecting body 83.
When the movable contact 5 is rotated by being pressed by the end of the movable contact 5 on the latch side, the engaging projection 82 of the other connecting body 83 that rotates in conjunction with the movable contact 5 rotates.
Presses the drive fitting 103 of the abnormality detecting mechanism 10 of the other circuit breaker body A against the spring force of the coil spring 104, and the latch piece 61 is released in the latch release direction by the engaging piece 103b of the drive fitting 103. It was designed to rotate to forcibly perform the breaking operation of the other circuit breaker body A. However, in such an interlocking disconnection mechanism of the conventional example, the spring force of the coil spring 104 acts in the direction of blocking the rotation of the connecting body 83,
There is a problem that the interlocking cutoff mechanism may not operate reliably due to loss of rotational energy.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a circuit capable of facilitating an assembling operation and surely performing an interlocking interruption operation. To provide a circuit breaker.

DISCLOSURE OF THE INVENTION (Embodiment 1) FIGS. 1 to 3 show an embodiment of the present invention, in which one end is a latch portion and the substantially central portion is connected to a handle 2 via a trip link 4. And the movable contact 5
A movable contact having a fixed contact terminal 9 having a fixed contact 8 facing the movable contact 7 provided at the other end of the movable contact 5, and a latch piece 61 with which one end of the movable contact 5 engages. 5, a latch mechanism 6 for latching 5, an abnormality detection mechanism 10 for driving the latch mechanism 6 in the unlatching direction when an abnormality is detected in response to a load current, and a movable contact 5 for pulling out the movable contact 5 when unlatched. A pair of circuit breaker main bodies A composed of urging means for urging are respectively housed in a pair of housings arranged side by side by combining the covers 1a, 1b on both sides and the partition wall 16,
In a circuit breaker similar to the conventional example, which is provided with an interlocking interrupting mechanism for interlocking the interrupting operation at the time of detecting an abnormality of the circuit breaker main body A housed in each accommodating portion, the shaft support is provided so as to face both sides of the partition wall 16. And connecting bodies 83a, 83b that are rotated in conjunction with each other
Latching pieces 87a, 87b that are engaged with the latching pieces 61 of the latch mechanism 6 while projecting contacting engaging pieces 82a, 82b that can be engaged with the respective latch-side ends of the movable contactors 5. When the movable contactor 5 of one of the circuit breaker main bodies A is driven in the tripping direction, the latch-side end of the movable contactor 5 and the contactor of the one coupling body 83a (or 83b) Engaging piece 82
a (or 82b) is engaged to rotate both connecting bodies 83a and 83b in an interlocking manner, and the latch piece 61 engaged with the latch engaging piece 87b (or 87a) of the other connecting body 83b (or 83a) is latched. In the embodiment, the latch pieces 61 of each circuit breaker main body A are provided with engaging portions 65a, 65b for engaging with the latch engaging pieces 87a, 87b, respectively. Has been formed.

Incidentally, in the embodiment, the protruding length of the contactor engaging pieces 82a, 82b of the two connecting bodies 83a, 83b are different, the two connecting bodies 83a, 8b.
Since the shape of 3b is not the same, the connecting pin 84 is
A fitting insertion hole 85 for the connecting pin 84 is provided in the other connecting body 83b that is provided so as to project. In addition, both circuit breaker body A
Latch pieces 61 are the same parts, and one of the engaging portions 65a, 65b (on the side of the partition wall 16) has a latch engaging piece 87a, 8a.
It is adapted to be engaged with 7b.

The operation of the embodiment will be described below. Now, FIG. 3 (a) shows a normal state in which the handle 2 is set to the ON state and the movable contact 7 is elastically contacted with the fixed contact 8. In this state, the contact between the connecting bodies 83a, 83b is made. Child engagement piece 8
The latches 2a and 82b and the end of the movable contact 5 on the latch side are not engaged. Next, when one circuit breaker body A overcurrent flows and the abnormality detection mechanism 10 operates, the latch piece 61
Is rotated in the latch release direction to release the latch of the movable contactor 5, and the movable contactor 5 is driven in the pull-out direction as shown in FIG. The end portion on the latch side and the contactor engaging piece 82b of the one connecting body 83b are engaged with each other, so that the connecting body 83b is rotated. At this time, the latch engagement piece 87a of the connection body 83a that is rotated in conjunction with the connection body 83b forcibly rotates the latch piece 61 in the latch release direction, and the movable contactor 5 of the other circuit breaker main body A is moved. Is released, the movable contact 7 is pulled out from the fixed contact 8, and the interlocking interruption operation is performed. In this case, there is no loss of rotational energy due to the coil spring 104 as in the conventional example, so that the interlocking disconnection operation can be reliably performed. Also,
Since the directions of the force applied to the connecting bodies 83a and 83b and the force pushing the latch piece 61 are set to have an appropriate angle, the connecting bodies are
The variation of the interlocking interruption operation due to rattling of 83a and 83b is reduced (the tolerance against rattling is increased) to eliminate the influence of the processing accuracy or assembly accuracy of each component. Also, the latch pieces 61 used for both circuit breaker main bodies A share the same shape, and the cost can be reduced. Further, the engaging portions 65a, 65b are provided so as to project in the empty space of each storage portion, and the housing 1
The narrow storage space inside can be used effectively.

[Advantages of the Invention] As described above, the present invention is provided at the movable contactor having one end as the latch portion and the substantially central portion connected to the handle through the trip link, and the other end of the movable contactor. A fixed contact terminal having a fixed contact facing the movable contact, a latch mechanism having a latch piece with which one end of the movable contact engages, and a latch mechanism for latching the movable contact; and when an abnormality is detected in response to a load current. An abnormality detection mechanism that drives the latch mechanism in the latch release direction and a pair of circuit breaker main bodies that are composed of a biasing unit that biases the movable contactor in the pull-out direction when the latch is released. The cover and the partition wall are connected to each other and housed in a pair of accommodating parts that are arranged side by side, and an interlocking interrupting mechanism that interlocks the interrupting operation when an abnormality is detected in the circuit breaker main body accommodated in each accommodating part is provided. In the circuit breaker, Since a connecting body that is axially supported on both sides of the cut wall and pivoted in conjunction with each other is provided, the pair of connected bodies can be arranged at a predetermined fixed position by the axial support to the partition wall. The work is facilitated, and the position of the connecting body corresponding to the latch mechanism becomes constant, so that the interlocking breaking mechanism can be operated reliably. Further, both connector bodies are provided with projecting contact engagement pieces that can be engaged with the latch-side ends of the movable contact pieces, and projecting latch engagement pieces that are engaged with the latch pieces of the latch mechanism. When the movable contact of one of the circuit breaker bodies is driven in the tripping direction, the latch-side end of the movable contact and the contact engagement piece of the one connection body engage and both connection bodies work together. Since the interlocking disconnection mechanism was formed so that the latch piece that was rotated and engaged with the latch engagement piece of the other coupling body was driven in the latch release direction, it is interlocked by the trip drive force of one movable contact. It is possible to directly drive the latch piece of the latch mechanism by the latch engagement piece of the connecting body that is rotated by the above-described method, and to reliably operate the interlocking cutoff mechanism without causing a loss of rotational energy. effective.

[Brief description of drawings]

FIG. 1 is a front view of an essential part of an embodiment of the present invention, and FIG. 2 (a).
(B) is an exploded perspective view of an essential part of the above, FIG. 3 (a) and (b) is a side view of an essential part for explaining the operation of the same, FIG. 4 is an exploded perspective view of a conventional example, FIG. 5 and FIG. 6 is an exploded perspective view of essential parts of the same as above, FIG. 7 is a top view of the same as above, FIG. 8 is a side view of the same as above, FIG. 9 is a longitudinal sectional view of the same as above, and FIG.
11 to 13 are sectional views showing the configuration and operation of the main part of the same. 1 is a housing, 2 is a handle, 4 is a trip link,
5 is a movable contactor, 6 is a latch mechanism, 7 is a movable contact, 8 is a fixed contact, 9 is a fixed contact terminal, 10 is an abnormality detection mechanism, 16 is a partition wall, 61 is a latch piece, and 82a and 82b are contactor contacts. Fragment, 83
Reference numerals a and 83b are connecting bodies, and reference numerals 87a and 87b are latch engagement pieces.

Claims (1)

[Claims] 1. A movable contact having one end as a latch and a substantially central portion connected to a handle through a trip link, and a fixed contact facing a movable contact provided at the other end of the movable contact. A fixed contact terminal equipped with a latch, a latch mechanism for latching the movable contact having a latch piece with which one end of the movable contact engages, and a latch mechanism driven in the latch release direction when an abnormality is detected in response to a load current. An abnormality detection mechanism that
A pair of circuit breaker bodies constituted by a biasing means for biasing the movable contactor in the pulling direction when the latch is released, and a pair of circuit breaker bodies arranged in parallel by connecting the covers on both sides and the partition wall. In the circuit breaker, which is housed in each of the compartments and is equipped with an interlocking interruption mechanism that interlocks the interruption operation when the abnormality of the circuit breaker body contained in each compartment is detected, A connecting body that is supported and rotated in conjunction with each other is provided, and in each of the connecting bodies, a contact piece that is engageable with a latch-side end of the movable contact piece is provided in a protruding manner. When the movable contact of one of the circuit breaker bodies is driven in the trip direction, the latch-side end of the movable contact and the contact of the one coupling body The child engagement piece engages and both connecting bodies are interlockedly rotated, and the other connecting body Circuit breaker, characterized in that the latch piece engaged with the latch engaging pieces formed the interlocking cutoff mechanism to be activated to unlatch direction.