JPH0439168B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an interlocking tripping mechanism for a circuit breaker, and more specifically, to an interlocking tripping mechanism for a circuit breaker. The present invention relates to a circuit breaker interlocking tripping mechanism that interlocks each circuit breaker with each other.

[Background Art] In a conventional multi-pole circuit breaker, the tripping device of each pole is provided with interlocking tripping plates connected to each other, and when the tripping device of one of the multiple poles is activated, By disrupting the equilibrium of the trip mechanism of that pole, and by disrupting the equilibrium of the trip mechanism of the other pole via the interlocking tripping plate,
Since the circuit was designed to interrupt all poles at the same time, the trip mechanism may not operate due to variations in the characteristics of the trip mechanism for each pole, and one tripping device can directly interrupt multiple tripping mechanisms. Since the trip mechanism was operated all at once, it was necessary to increase the output of the tripping device.

[Object of the Invention] The present invention has been made in view of the above points, and its main purpose is to be able to be used as a single-pole circuit breaker, and also to be able to be used as a multi-pole circuit breaker. When used, the load acting on the tripping device may be relatively small to ensure stable operation, and its other purpose is when multiple devices are connected for multi-pole use. To provide an interlocking tripping mechanism for a circuit breaker that does not require a large output for the tripping device and can be made as small as a single-pole tripping device even though a plurality of tripping devices are driven at the same time. There is a particular thing.

[Disclosure of the Invention] (Examples) Examples of the present invention will be described below based on the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a tripping device driven by an abnormal current, such as a short-circuit current, several times the rated value or more, and is constituted by a solenoid. The solenoid 1 includes a coil 10 through which a load current flows and a coil 10 inserted into the coil 10.
Cylinder 1 is attracted and driven by the magnetic force generated by
1 and a holding frame 12 that holds the cylinder 11. The piston rod 13 of the cylinder 11 has a locking head 14 at its tip, and a notch 20 at the tip of the removal plate 2 engages with the locking head 14. One end of the coil 10 is connected to a terminal plate 30 whose one end protrudes from the casing 3, and the other end is connected to a movable contact plate 4, which will be described later, via a lead wire 32.

A pair of support plates 61 and 62, which serve as a frame 6 for holding the handle 5 and the trip mechanism T, extend from the holding frame 12. Both support plates 6
1 and 62 are provided substantially parallel to each other and facing each other. An arc horn 33 is extended from the tip of the support plate 62 . A shaft hole 63 is provided at the upper end of both support plates 61 and 62.
64 is formed, and the upper end protrudes from the casing 3. Both ends of the support shaft 51, which passes through the shaft hole 50 provided at the lower end of the handle 5, are held in the shaft holes 63 and 64, and the handle 5 is raised and lowered. Freely pivoted.
An enlarged portion 53 having a through hole 52 is formed on the lower peripheral surface of the handle, and one leg piece 71 of a link pin 70 formed in a substantially U-shape is rotatably inserted into the through hole 52. The other leg piece 72 of the link pin 70
are rotatably inserted into shaft holes 74 and 75 formed in the longitudinal center of a link arm 73 constituting the trip mechanism T. The tip of the link pin 70 is inserted into a guide hole 65 formed in the support plate 62, and the leg piece 71 connected to the handle 5 side of the link pin 70 slides on the arcuate edge 66 of the guide hole 65.
The leg piece 72 on the side of the link arm 73 is restricted so that it can slide only in the vertical direction by slidingly contacting the linear edge 67. A coil spring 54 is wound around one end of the support shaft 51, and the coil spring 54 locks one end to one end of the link pin 70 and the other end to the support plate 62. The handle 5 is biased in such a direction that its upper end part falls toward the solenoid 1 side.

The link arm 73 is a pair of substantially parallel arm portions 7.
6, 77 and a bridge portion 78 connecting both arm portions 76, 77, it is formed into a substantially H shape, and both longitudinal ends of both arm portions 76, 77,
and shaft holes 74, 75, 79 in the center, respectively.
80, 81, and 82 are formed. shaft hole 74,
A leg piece 72 is connected to one of the link pins 70 at 75 . The locking pin 21 is inserted into the shaft holes 81 and 82. A support shaft 40 is inserted through the shaft holes 79 and 80, and this support shaft 40 is inserted into a shaft hole 41 formed in the center of the movable contact plate 4. The movable contact plate 4 has a movable contact 42 at the lower edge of one end, and one end of a lead wire 32 connected to the coil 10 is connected to the other end. A locking piece 43 is formed on the upper edge of the movable contact plate 4, and one end of a return spring 85 is locked to this locking piece 43. The other end of the return spring 85 is locked in a locking groove 68 formed at the tip of the support plate 62. A terminal plate 31 having a fixed contact 44 disposed so as to be able to contact the movable contact 42 is disposed below the movable contact plate 4 , and a lower end portion of the terminal plate 31 protrudes from the casing 3 . An arc traveling plate 34 is extended from the terminal plate 31, and the arc traveling plate 34 faces the arc horn 33 and is connected to the arc traveling plate 3.
An arc extinguishing device 36 is disposed between the arc horn 33 and the arc horn 33 .

The arc extinguishing device 36 has a recess 37 through which the tip of the movable contact plate 4 can pass, and a number of grid plates 38 spaced apart from each other at small intervals. The grid plate 38 is held by a pair of side plates 39, and side plates 39 are provided at the edges of the grid plate 38.
An end plate 97 fixed to is provided. An arc gas outflow window 98 is formed in the end plate 97.
A direct release prevention plate portion 99 is provided at the center of the grid plate 8 at a location corresponding to the recess 37 of the grid plate 38.

Axial holes 22 and 23 are formed in the pull-out plate 2,
The support shafts 26 are rotatably inserted into shaft holes 24 and 25 formed in the support plates 61 and 62, respectively. One end of the latch link 27 overlaps the lower surface of the tripping plate 2. The latch link 27 has a shaft hole 2.
8 and 29 are formed and are rotatably supported in shaft holes 24 and 25 of the frame 6 along with the detachable plate 2 by a support shaft 26. Latch link 27 has leg piece 8
6 extends downward, and a hook portion 8 is formed at the lower end of this leg piece 86. The tripping plate 2 and the latch link 27 are biased in a direction to pull up the piston rod 13 by coil springs 83 and 84 inserted through the support shaft 26, respectively.
A locking pin 2 inserted into the link arm 73 is attached to the hook portion 8 formed on the leg piece 86 of the latch link 27.
1 is engaged.

By the way, the support shaft 26 is inserted into the shaft holes 101 and 102 of the interlocking element 100 which contact the upper surface of the removal plate 2, and pivotally supports the interlocking element 100. The interlocking element 100 connects a pair of arm parts 103 and 104 to a cylindrical bridge part 1.
05, and one arm portion 103 is formed into a substantially L-shape with a pressing piece 106 extending downward. Pressing piece 10
The locking pin 21 is in contact with the lower end of the locking pin 6 . A through hole is formed in the bridging part 105 of the interlocking element 100 as a connecting part 107, and this bridging part 105 comes into contact with the upper surface of the tripping plate 2. An interlocking bar 108 is inserted through the through hole 107, and the interlocking bar 108 protrudes from the side surface of the casing 3.

The casing 3 is formed by joining a pair of half bodies 3a and 3b, and as shown in FIG. 6, an engagement groove 90 is provided at the upper corner of each half body 3a and 3b. A substantially U-shaped connecting body 91 is inserted into the engaging groove 90, and the connecting body 91 is inserted into the engaging groove 90.
The mounting hole 92 formed in each leg piece and the half body 3a,
The two halves 3a and 3b are joined together by inserting a connecting pin 93 through the attachment hole 94 of the half body 3b. From this configuration, casing 3
By arranging them in the axial direction of the connecting pin 93, a plurality of casings 3 can be connected simultaneously with one connecting pin 93.

(Operation) The operation will be explained below. First, when the handle 5 is tilted toward the solenoid 1 side, the support shaft 51 of the handle 5 and the link arm 7 of the link pin 70
The straight line connecting the leg piece 72 on the third side is located closer to the solenoid 1 than the leg piece 71 on the handle 5 side of the link pin 70, and the spring force of the return spring 85 tilts the handle 5 toward the solenoid 1 side. It is transmitted as follows. At this time, the handle 5 is biased by the coil spring 54 so as to fall toward the solenoid 1, and the tripping plate 2 and the latch link 27 are biased by the coil springs 83 and 84, respectively, in a direction to move the piston rod 13 upward. Also,
At this time, since the link arm 73 is moved upward by the spring force of the return spring 85, the movable contact plate 4 also moves upward, so that the movable contact 42 and the fixed contact 44 are separated.

Next, when the handle 5 is tilted to the opposite side (right side) from the solenoid 1 as shown in FIG. The leg piece 71 of the link pin 70 on the handle 5 side is located on the left side, and the force exerted by the spring force of the return spring 85 is transmitted in a direction to tilt the handle 5 to the right. Therefore, the handle 5 is held tilted to the right. At this time, the leg piece 7 of the link pin 70 on the link arm 73 side
2 moves downward along the upper edge 67 of the guide hole 65,
Since the movable contact plate 4 is pushed down, the movable contact 42 and the fixed contact 44 come into pressure contact, and an electric path passing through the fixed contact 44, the movable contact 42, the movable contact plate 4, the lead wire 32, and the coil 10 is formed between both terminal plates 30 and 31. is closed.

In this way, when the fixed contact 44 and the movable contact 42 are in contact and the electric circuit is closed, if an excessive abnormal current flows in this electric circuit, the piston rod 13 will be attracted by the magnetic force generated by the coil 10. The piston rod 13 moves downward toward the cylinder 10. When the piston rod 13 moves downward, the tip of the tripping plate 2 connected to the locking head 14 moves downward, and the tip of the latch link 27, which overlaps the lower surface of the tripping plate 2, moves downward. The leg piece 86 is flipped up, thereby releasing the engagement between the hook portion 8 and the locking pin 21. When the engagement between the hook 8 and the locking pin 21 is released, the link arm 73 rotates around the leg piece 72 of the link pin 70 due to the spring force of the return spring 85, and the movable contact plate 4 is pulled upward. It will be done. At this time, the return spring 85 contracts, so the spring force decreases.
Even if the spring force of the coil spring 54 biasing the handle 5 overcomes the spring force of the return spring 85 acting on the handle 5, the handle 5 is tilted to the left. That is, the movable contact 42 and the fixed contact 44
At the same time, the handle 5 also returns to its original position. Here, the movable contact plate 4
When the arc moves upward, an arc travels between the arc horn 33 and the arc traveling plate 34 via the arc extinguishing device 36, and the arc generated when the circuit is interrupted is passed through the arc extinguishing device 3.
The arc is extinguished within 6. As described above, when an abnormal current flows and the movable contact 42 and the fixed contact 44 are separated, the locking pin 21 provided on the link arm 73
moves downward, and the pressing piece 1 of the interlocking element 100
Since 06 is in contact with this locking pin 21, the downward movement of the locking pin 21 causes the interlocking element 10 to
0 rotates around the support shaft 26 and the tripping plate 2 moves downward, at the same time the bridge portion 105 of the interlocking element 100 moves downward so as to press the tripping plate 2 downward. Additionally, an interlocking bar 108 is provided at the bridge portion 105.
is inserted, and at this time, the interlocking bar 108 protruding from the casing 3 also moves downward. That is, the interlocking element 100 moves the interlocking bar 108 downward by the return force generated when the equilibrium state of the trip mechanism T collapses, and even if the output of the solenoid 1 is small, the force for moving the interlocking bar 108 downward is large. It is something that can be taken.

Therefore, if a plurality of circuit breakers having the same configuration as above are arranged next to each other and the bridge portions 105 of the respective interlocking elements 100 are connected by one interlocking bar 108, one of the plurality of circuit breakers When one abnormal current flows and the circuit is interrupted, the bridge part 105 of the interlocking element 100 of the circuit breaker moves down and the interlocking bar 1
08 moves down, thereby moving down the bridge portion 105 of the interlock 100 of the other circuit breakers and moving the tripping plate 2 down, and as a result, all the circuit breakers are placed in the disconnected state. It is something that can be done. Here, a spacer 110 is interposed between the handles 5 of adjacent circuit breakers as shown in FIGS. By inserting the handle 5 through the handle 5, the handle 5 can be operated simultaneously for a plurality of circuit breakers. Furthermore, the casings 3 of the circuit breakers are connected to each other by the connecting pins 93 as described above. In this way, a multi-pole circuit breaker can be constructed by installing a single-pole circuit breaker.

[Effects of the Invention] As described above, the present invention is arranged such that one end is in contact with the locking pin, and when the locking pin moves, a portion is pressed by the locking pin and pulled out. An interlocking element is provided that biases the plate in a direction in which the engagement state between the latch link and the locking pin is released, and the interlocking element has a connecting part that connects an interlocking bar that can be installed between the interlocking elements of adjacent circuit breakers. is formed, so it can be used as a single-pole circuit breaker, and if an interlocking bar is installed between the interlocking elements of each pole and the interlocking elements are connected, the tripping device of a single circuit breaker can be operated. It is possible to configure a multi-polar circuit breaker by transmitting the power to another circuit breaker, and the advantage of this is that the load acting on the tripping device is relatively small and stable operation can be achieved. have
In addition, because the above configuration uses the return force generated when the trip mechanism collapses to move the interlocking bar downward, the tripping device requires a large output even when multiple pieces are connected for multi-pole use. It has the advantage that the tripping device can be made smaller and similar to that for a single pole, even though a plurality of tripping devices are driven at the same time. Moreover, it is equipped with a locking pin that removably engages with a hook provided on the latch link, and is also equipped with a movable contact, so that when the locking pin is engaged with the hook, the locking pin engages with the hook as the handle is raised and fallen. The link arm moves the movable contact toward and away from the fixed contact by rotating around the locking pin, and the movable contact moves when the locking pin releases the engagement state with the hook part of the latch link by operating the tripping plate. a return spring that applies a spring force to the link arm to separate it from the fixed contact; and a return spring that applies a spring force to the link arm to separate it from the fixed contact; Since it is equipped with a linkage that biases the engagement state in the direction of release, when the handle is raised and lowered to move the movable contact toward and away from the fixed contact, the link arm rotates around the locking pin. However, since the position of the locking pin hardly changes, it does not affect the interlocking element, and only when the tripping device is activated, the locking pin moves significantly and the interlocking element is moved. It is operated. In other words, when the handle is operated, the position of the locking pin does not change, so the handle can be operated smoothly.On the other hand, when the tripping device is activated, the spring force of the return spring is used to operate the interlocking element with a large force. This has the effect of making it possible to

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing the same trip state as above, and FIG.
The figure is an exploded perspective view of the same as the above, Figure 4 is a partially exploded perspective view showing the connecting part of the handle used in the same as the above, Figure 5 is a partial perspective view showing the connecting part of the handle used in the same as the above, and Figure 6 is the same as the above. FIG. 2 is a partially exploded perspective view of a casing used for 1 is a tripping mechanism, 2 is a tripping plate, 4 is a movable contact plate, 5 is a handle, 6 is a frame, 8 is a hook portion, 21 is a locking pin, 27 is a latch link, 42
44 is a movable contact, 73 is a link arm, 85 is a return spring, 100 is an interlocking element, 107 is a connecting portion, 108 is an interlocking bar, and T is a trip mechanism.

Claims (1)

[Claims] 1. An operating handle that can be raised and lowered freely,
A trip device that is activated when an excessive abnormal current passes through it, a latch link that is driven in conjunction with the trip device, and a latch link that is interposed between the trip device and the latch link to transmit the operation of the trip device to the latch link. It is equipped with a locking pin that removably engages with a hook provided on the latch link, and a movable contact that allows the handle to be raised and lowered when the locking pin is engaged with the hook. When the link arm moves the movable contact toward and away from the fixed contact by rotating around the lock pin as A return spring that applies a spring force to the link arm to separate the movable contact from the fixed contact, a frame that holds the handle, the latch link, and the tripping plate, and one end of which is arranged so as to abut the locking pin. and an interlocking element which is partially pressed by the locking pin when the locking pin is moved and urges the above-mentioned tripping plate in a direction in which the engagement between the latch link and the locking pin is released. 1. An interlocking tripping mechanism for a circuit breaker, characterized in that the interlocking element is formed with a connecting part that connects an interlocking bar that can be installed between interlocking elements of adjacent circuit breakers.