JPH0757593A - Operating mechanism for circuit breaker - Google Patents

Abstract

PURPOSE:To provide the mechanical interlock function of a manual trip device in an opening/closing mechanism having an opening/closing shaft on the outside of an operation box. CONSTITUTION:A lock plate 31 formed with a hook section 31a is fixed to an opening/closing lever 3 operating an opening/closing section. When the push button 12a of a manual trip device 9 is pushed while the locking of the opening/ closing lever 3 by a latch 6 is released in the open state, the hook section 13a of a stopper 13 is meshed with the hook section 31a of the lock plate 31. The opening/closing lever 3 is locked not to be turned on during the action of the push button 12a even when the opening/closing shaft 2 is located outside the operation box 1, thus a mechanical interlock function is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating mechanism of a circuit breaker, and more particularly to a mechanical interlock means of its manual trip device.

[0002]

5 to 7 are side views showing a manual tripping device portion in a conventional circuit breaker (vacuum circuit breaker) operating mechanism. FIG. 5 is an open state, FIG. 6 is a closed state, and FIG. Shows the state where the push button of the manual tripping device is pushed. First, in FIG. 5, an opening / closing lever 3 is fixed for each phase to an opening / closing shaft 2 rotatably supported at both ends so as to straddle each phase in the operation box 1. A vacuum valve 4 as an opening / closing unit is interlocked via a conceptually shown link. A roller 5 is attached to the tip of the central phase opening / closing lever 3, and a latch 6 is rotatably supported by a shaft 7 in opposition to the roller 5. The latch 6 is constantly urged in the clockwise direction by a back spring (not shown), and the trip lever 8 is fixed to the back surface. The opening / closing lever 3 is provided with a protruding piece 3 a on the side opposite to the roller 5.

A manual tripping device 9 adjacent to the opening / closing lever 3
Is provided. In the manual trip device 9, a stepped operation shaft 12 having a push button 12a on its head is slidably held by a support frame 11 mounted on an L-shaped base 10, and a tip end of the operation device 12 is made of a rectangular block. The stopper 13 has a structure in which it is slidably fitted. The stopper 13 is prevented from coming off by a double nut 14, and a compression spring 16 is inserted between the stopper piece 15 fixed to the operation shaft 12 and the stopper 13.

A return spring 17, which is a compression spring, is inserted between the push button 12a and the support frame 11, and the operating shaft 12 is held at a position shown in the figure which is regulated by a stopper piece 18 fixed thereto. There is. A lever 20 is provided between the manual tripping device 9 and the latch 6, the central portion of which is rotatably supported by a shaft 19. Lever 2
One end of 0 is connected to the operating shaft 12 via a pin 21, and the other end is close to the trip lever 8 via a pin 22.

The circuit breaker shown is operated by the roller 5 being pushed up by a closing electromagnet (not shown).
That is, when the roller 5 is pushed up, the opening / closing lever 3 is rotated clockwise, and the movable contactor 4a interlocked with the roller 5 is pressed by the fixed contactor 4b via the link, so that the vacuum valve 4 is moved.
Closes. At the same time, the latch 6 which receives the force of the back spring rotates clockwise to enter under the roller 5, and holds the opening / closing lever 3 in the closed position even after the closing electromagnet is demagnetized. FIG. 6 shows such a state.

When the push button 12a is pushed in the closed state of FIG. 6, the stopper 13 hits the projecting piece 3a of the opening / closing lever 3 and stops, but the operating shaft 12 moves right against the compression spring 17 to move the lever 20 to the shaft 19. Rotate counterclockwise around the fulcrum. Therefore, the pin 22
The latch 6 pushed by is rotated counterclockwise to allow the roller 5 to escape. As a result, the opening / closing lever 3 rotates counterclockwise and the vacuum valve 4 (FIG. 5) opens. At the same time, the stopper 1 that was prevented from moving by the protruding piece 3a of the opening / closing lever 3
3 is advanced to the lower side of the protruding piece 3a by the restoring force of the compression spring 16. FIG. 7 shows the state.

Even when the closing operation is performed by the closing electromagnet in this state, the opening / closing lever 3 cannot rotate because the protruding piece 3a hits the stopper 13, and therefore the vacuum valve 4 is not closed. Further, in the open state of FIG. 5, the push button 12a is
When is pressed, the state is the same as that in FIG. 7, and in that state, the vacuum valve 4 cannot be closed. That is, even if the electrical closing operation is mistakenly performed while the push button 12a is being pressed, the interlocking is mechanically performed so as to prevent the closing operation.

[0008]

In the above-mentioned conventional structure, the opening / closing shaft 2 is provided inside the operation box 1.
A projecting piece 3 a of the opening / closing lever 3 provided on the opposite side of the roller 4 with the opening / closing shaft 2 interposed is also present inside the operation box 1. However, there is also a circuit breaker in which the opening / closing shaft is provided near the vacuum valve on the outside of the operation box, and in that case, the protruding piece that contacts the stopper of the manual tripping device cannot be provided inside the operation box, Therefore, the above mechanical interlock could not be constructed. Therefore, even if the opening / closing shaft is provided outside the operation box, the present invention has a problem of a mechanical interlock for preventing the closing operation during operation of the push button by causing the stopper of the manual trip device to act on the opening / closing lever. It is an object of the present invention to provide an opening / closing mechanism of a circuit breaker that can be configured without the above.

[0009]

[Means for Solving the Problems] The above object is achieved. According to the present invention, when the manual tripping device is operated while the vacuum valve is open, a hook portion that meshes with each other and locks the opening / closing lever is provided between the manual tripping device and the opening / closing lever.

[0010]

[Function] Instead of the protruding piece that is applied to the stopper of the manual tripping device, a hook portion that engages with each other and locks the opening / closing lever is provided between the manual tripping device and the opening / closing lever to prevent closing during operation of the push button. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention in a vacuum circuit breaker will be described below with reference to FIGS. Here, FIG.
~ Fig. 3 is a side view of the manual tripping device portion in the operating mechanism of the vacuum circuit breaker, Fig. 1 shows an open state, Fig. 2 shows a closed state, and Fig. 3 shows a state in which the push button of the tripping device is pressed, FIG. 4 is a side view of the vacuum circuit breaker. The same reference numerals are used for the parts corresponding to those of the conventional example.

First, the overall structure of the vacuum circuit breaker will be briefly described with reference to FIG. In the figure, operation box 1
An opening / closing shaft 2 is rotatably supported by a bearing 23 on the front surface of the opening / closing shaft 2, and an opening / closing lever 3 directed to the inside of the operation box 1 and an operation lever 24 directed to the opposite side thereof are fixed to the opening / closing shaft 2. Further, a vacuum valve 4 for three phases is attached to the front surface of the operation box 1 via an insulator, and the movable contactor 4a thereof has an insulating rod 25, a contact spring 26, an operation shaft 27, etc. It is connected to the tip.

When the roller 28 attached to the opening / closing lever 3 in the operation box 1 is pushed up by the closing electromagnet 29, the opening / closing shaft 2 rotates counterclockwise, and the movable contact 4a of the vacuum valve 4 is moved by the operation lever 24. It is pushed down and closed. At the same time, the latch 6 enters under the roller 5 at the tip of the opening / closing lever 3 and holds the opening / closing lever 3 in the closed position. Whether the manual trip device 9 is operated in this closed state,
When the trip coil 30 is driven, the latch 6 rotates clockwise, so that the roller 5 is opened, the opening / closing lever 3 rotates clockwise, and the vacuum valve 4 opens.

Here, in FIG. 1, a lock plate 31 is fixed to the side surface of the opening / closing lever 3 by a shaft 32, and the roller 2
8 is supported by a shaft 32. The lock plate 31 is formed with a hook portion 31a at a lower end thereof. The structure of the latch 6 supported by the shaft 7, the trip lever 8 fixed thereto, the lever 20 supported by the shaft 19 and the like is the same as the conventional one, but the trip coil 30 is connected to the upper end of the trip lever 8. The long hole 8a is provided, and the lever 2
An L curved portion 20a is provided at the upper end of 0 instead of the pin 21. The overall structure of the manual trip device 9 is substantially the same as the conventional one, but in this case, the stopper 13 is provided with a hook portion 13a that meshes with the hook portion 31a of the lock plate 31 as described later. When the roller 28 is pushed up by the closing electromagnet 29 from the open state shown in FIG. 1, the state shown in FIG. 2 is established, and the vacuum valve 4 is closed as described above.

When the push button 12a is pushed in the closed state of FIG. 2, the stopper 13 stops because the hook portion 13a hits the hook portion 31a of the lock plate 31, but the operation shaft 12 moves to the left against the compression spring 16. Lever 19 to shaft 19
Rotate clockwise around the fulcrum. Therefore, the latch 6 pushed by the L curved portion 20a via the trip lever 8 rotates clockwise to release the roller 5. As a result, the opening / closing lever 3 rotates clockwise, and the vacuum valve 4 opens. At the same time, in the stopper 13 whose movement is blocked by the hook portion 31a of the lock plate 31, the hook portion 13a is advanced to the upper side of the hook portion 31a by the restoring force of the compression spring 16, and the hook portion 13a and the hook portion 31a are mutually separated. Mesh with each other. FIG. 3 shows the state.

Even if the closing operation is performed by the closing electromagnet 29 (FIG. 1) in the state of FIG. 3, the opening / closing lever 3 is locked by the lock plate 31.
Since it is pressed by the stopper 13 via the pin, it cannot rotate, and therefore the vacuum valve 4 is not closed. Further, when the push button 12a is pressed in the open state of FIG. 1, the state becomes the same as that of FIG. 3, and in that state, the vacuum valve 4 cannot be closed. That is, even if the electrical closing operation is mistakenly performed while the push button 12a is being pressed, the interlocking is mechanically performed so as to prevent the closing operation.

[0017]

As described above, according to the present invention, when the manual tripping device is operated in the open state of the opening / closing part, the hook part which meshes with each other to lock the opening / closing lever is provided between the manual tripping device and the opening / closing lever. Even if the opening / closing shaft is provided outside the operation box, the mechanical interlock for preventing the manual tripping device from being closed during the push button operation can be configured without any problem.

[Brief description of drawings]

FIG. 1 is a side view of an open / close state of a manual trip device portion of an opening / closing mechanism according to an embodiment of the present invention.

FIG. 2 is a side view of the manual trip device portion of FIG. 1 in a closed state.

FIG. 3 is a side view showing a state where a push button of the manual trip device portion of FIG. 1 is pressed.

FIG. 4 is a side view of a vacuum circuit breaker including the opening / closing mechanism of FIG.

FIG. 5 is a side view of an open / close state of a manual trip device portion in the opening / closing mechanism of the conventional example.

6 is a side view of the manual trip device portion of FIG. 5 in a closed state.

FIG. 7 is a side view showing a state where a push button of the manual trip device portion of FIG. 5 is pressed.

[Explanation of symbols]

 1 Operation box 2 Open / close shaft 3 Open / close lever 4 Vacuum valve 6 Latch 9 Manual tripping device 12 Operation shaft 12a Push button 13 Stopper 13a Hook part 31 Lock plate 31a Hook part

Claims (1)

[Claims] 1. An operating mechanism of a circuit breaker equipped with a manual trip device for unlocking an opening / closing lever by a latch by a manual operation and opening the opening / closing part interlocked with the opening / closing lever, in an open state of the opening / closing part. An operating mechanism for a circuit breaker, characterized in that a hook portion is provided between the manual trip device and the opening / closing lever to engage with each other when the manual trip device is operated to lock the opening / closing lever.