JPH0340323A - Operating mechanism of breaker - Google Patents

Abstract

PURPOSE:To prevent unnecessary operation of an operating mechanism by providing such a stopper as to abut an energy storing link and rotate in one direction upon release of locking of a latch while to rotate in the other direction in accordance with the rotation of the energy storing link and abut against a charge lever to inhibit the rotation of the charge lever in the other state of the latch. CONSTITUTION:Upon release of locking of a latch 12, a pin 11 for connecting a first link 10 to a second link 9 is moved in one direction. Accordingly, a movable contact is brought into contact or separation to or from a stationary contact by an output lever 14. An energy storing link 6 is abutted against a stopper 60. The stopper 60 is rotated in accordance with the further oscillation of the link 6 to be separated from a charge lever 2 so that the charge lever 2 can be freely rotated. Upon locking of the latch 12, the position or motion of the pin 11 is limited, and the oscillating range of the link 6 is also restricted. Therefore, the link 6 is not abutted against the stopper 60, and consequently, the stopper can be rotated to be abutted against the lever 2, thereby inhibiting the rotation of the lever 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operating mechanism for a circuit breaker used in power switching equipment.

[Prior Art] The operating mechanism of a conventional circuit breaker is shown in FIG. FIG. 5 shows the reset state of the breaker, in which the fixed contact 17b and the movable contact 17a of the switch tube 17 are separated and are in an open state.

In the figure, the charge lever 2 is connected to the frame 1 by the shaft 3.
00 and is rotatably supported. A pin 35 is fixed to the shaft 3. Further, the charge lever 2 is provided with a roller 4 rotatably supported by a pin 5.

The output lever 14 is rotatably supported by a shaft 15. One end of the output lever is connected to the movable contact 17a of the switch pipe 17 via a drive mechanism consisting of pins 16, 46, 44, links 48, 49, 45, 41, etc. The rotational movement of the output lever 14 opens and closes the movable contact 17a and the fixed contact 17b. The latch 12 is the shaft 20
It is rotatably supported by a shaft, and its one end 12a is locked by an intermediate latch 21. Between the latch 12 and the output lever 14 are links 9 and 10 rotatably connected by pins 11.8 and 13. Further, one end of the energy storage link 6 is rotatably connected to the pin 8 by a pin 8. The energy storage link 6 has a guide member 6a that is slidably fitted to the shaft 7 and a back portion 6b that is pressed by a roller 4 provided on the charge lever 2. The pin 8 is tensilely biased in one direction by a tension spring 19.

[Problem B to be solved by the invention] Since the conventional breaker operating mechanism is configured as described above, the charge lever 2 is in the state where the breaker is reset as shown by the two-dot chain line in FIG. But it can be rotated. If an attempt is made to further forcefully rotate the charge lever 2 from this state, the energy storage link 6 will rotate counterclockwise about the shaft 7, for example, and the operating mechanism will make unnecessary movements. In the worst case, the operation mechanism may be damaged or the breaker may be turned on.

Furthermore, since the charge lever 2 can be rotated at any time, there is a problem in that it is unclear whether the breaker is in the closing state or in the reset state.

This invention was made in order to solve the above-mentioned problems, and provides a breaker operating mechanism that does not make unnecessary movements and that allows the state of the breaker to be clearly determined. The purpose is to submit.

[Means for Solving the Problems] A breaker operating mechanism according to the present invention is provided with an output lever on an output lever that is rotatably supported on a first shaft and whose end is connected to a movable contact drive mechanism. a first link rotatably supported at a point; a second link coupled to the first link; a second link rotatably supported at a second shaft; One end of the second link is rotatably supported, and around the second axis δ
a latch which is biased with a rotational force in this direction and whose rotational movement is locked at one end; a guide groove which is slidably fitted to the third shaft; a storage link rotatably coupled to the pin coupling part of the link, one end of which is connected to the pin engagement part of the first and second links, and applies a biasing force in one direction to the pin coupling part; a spring; a charge lever that is rotatably supported on a fourth shaft and presses the energy storage link in one direction while the third shaft and the guide groove slide against the biasing force of the spring; The latch is rotatably supported by a fifth shaft and is biased with a rotational force in one direction, and the latch contacts the energy storage link in the unlocked state, and the movement of the energy storage link causes the energy storage link to The charge lever is rotated in the other direction against the biasing force, and is rotated in the first direction by the rotational force in another state, and includes a stopper that comes into contact with the charge lever and prevents rotation of the charge lever. There is.

[Operation] When the latch is released, that is, the circuit breaker is disconnected, the pin connecting the first link and the second link is moved in one direction by the biasing force of the spring. Ru. As the pin moves, the output lever rotates in a direction that separates the movable contact and the fixed contact. Further, the energy storage link swings while its guide groove slides on the third shaft, and comes into contact with the stopper. The stopper rotates around the fifth axis due to further rocking of the energy storage link and moves away from the charge lever. As a result, the charge lever becomes rotatable.

On the other hand, when the latch is not released, that is, when the circuit breaker is in the reset or closed state, the position of the pin connecting the first link and the second link or the amount of movement of the pin is limited. , the swing range of the energy storage link is also limited. Therefore, the energy storage link and the stopper do not come into contact with each other, and the stopper rotates due to its biasing force and comes into contact with the charge lever to prevent rotation of the charge lever.

[Example] The operating mechanism of a circuit breaker according to the present invention will be explained using FIGS. 1, 2, 3, and 4 showing an example thereof.

FIG. 4 is a perspective view showing the general appearance of a breaker equipped with a breaker operating mechanism according to the present invention. Terminals 42 and 43 each have three terminals in order to correspond to a three-phase power bus.
A switch tube 17, a drive mechanism 44, 45, 47, etc. are provided between the terminals 42 and 43 which are arranged in pairs and are opposed to each other. A shaft 3 passes through the front surface of the housing l of the operating mechanism section of the breaker, and a pin 35 is implanted in the shaft 3. The shaft 3 can be rotated by engaging a handle (not shown) with the pin 35.

1, 2, and 3 are sectional views showing the configuration of the operating mechanism of the breaker, in which FIG. 1 shows the breaker in the reset state, FIG. 2 shows the breaker in the closed state, and FIG. 3 shows the breaker in the closed state. Each shows the disconnection status of the circuit breaker.

In each figure, the output lever 14 is rotatably supported around a shaft 15 provided on the frame 100.

One end of the output lever has pins 16, 46, 44 and 48,
It is connected to the movable contact 17a of the switch tube 17 via a drive mechanism composed of 49, 45, 47, etc.

A fixed contact 17b is provided inside the switch tube 17 so as to face the movable contact 17a. Movable contact 17a and fixed contact 17b are connected to terminals 42 and 43, respectively.

The latch 12 is rotatably supported by a shaft 20 on the frame 100. Output lever 14 and latch 12
and the first and second pins connected by pin 8.
A link 1O19 is provided. first link 10
is rotatably connected to the output lever 14 by a pin 13, and the second link 9 is rotatably connected to the latch 12 by a pin ti. A storage link 6 is pin-coupled to the pin 8, and one end of a spring 19 is engaged. The energy storage link 6 has a guide groove 6a that is movably engaged with the shaft 7, and a back portion 6b that receives a charger for resetting the operating mechanism of the breaker. At a position a predetermined distance away from the shaft 7, the charge lever 2 is connected to the frame 100.
It is rotatably supported by a shaft 3 that passes through the.

The charge lever 2 is provided with a roller 4 rotatably supported by a pin 5. Rotation of the charge lever 2 causes the roller 4 to come into contact with the back portion 6b of the energy storage link 6, and by pressing the energy storage link 6 in a predetermined direction, the operating mechanism of the breaker is reset. The stopper 60 is rotatably supported by a shaft 61, and is biased by a spring 63 to rotate counterclockwise. Further, the rotation angle is regulated by the pin 21. Tip 60a of stopper 60
When in contact with the pin 62 as shown in FIGS. 1 and 2, it contacts the roller 4 and prevents the charge lever from rotating clockwise.

The closing trigger 29 is rotatably supported by a shaft 20 coaxially with the latch 12. Closing trigger 29 is output lever 1
The output lever 14 has a notch 29a that engages with the pin 13 provided on the output lever 14 to lock the operation of the output lever 14. The input lever 27 is rotatably supported by a shaft 30. The closing lever 27 and the closing trigger 29 are connected by a link 25 connected by pins 26 and 28, respectively. The intermediate latch 21 is rotatably supported by a shaft 22,
The tip 12a of the latch 12 is locked by the notch 21a. The trigger 37 is rotatably supported by the shaft 23, and stops the rotation of the intermediate latch 21 by coming into contact with the end 21b of the intermediate latch 21.

In addition, the closing lever 27, the trigger 37, the intermediate latch 21,
The charge lever 2 and the like are biased in a predetermined direction by a spring or the like (not shown as it is well known) so as to be reset to a predetermined position. The frame 100 includes electromagnets 31 and 33 for rotating the input lever 27 and the trigger 37.
is provided.

Next, the operation of the embodiment will be explained.

Assume that in the reset state shown in FIG. 1, the electromagnet 31 is energized and the plunger 32 extends rightward in the figure.

The state at this time is shown in FIG. The input lever 27 is connected to the shaft 30
rotated counterclockwise around the

The rotational force of the input lever 27 is applied to the bin 26 and the link 2S.
This is transmitted to the closing trigger 29 via the bottle 28, and the closing trigger 29 rotates clockwise around the shaft 20.

As a result, the notch 29a of the input trigger 29 and the bottle 13
The lock is released. As a result, the bin 8 is moved to the right in the figure by the biasing force of the spring 19, the first and second links 10.9 are extended as shown in FIG. Rotate in the direction. The rotational force of the output lever 14 is generated by the drive mechanism 48°49, 44.47
etc., to the movable contact 17a, and the movable contact 1
7a is connected to the fixed contact 17b, and the circuit breaker is turned on. At this time, the energy storage link 6 and the stopper 60 are not in contact with each other, and the stopper 60 is in contact with the roller 4 to prevent the charge lever 2 from rotating clockwise.

Next, suppose that a fault current occurs due to a ground fault or the like in the closed state of the breaker shown in FIG. The fault current detection energizes electromagnet 33 and extends plunger 34, causing trigger 37 to rotate counterclockwise about axis 23. The state at this time is shown in FIG. By rotating the trigger 37 counterclockwise, the intermediate latch 21 is unlocked.
Intermediate latch 21 rotates counterclockwise about axis 22. When the intermediate latch 21 rotates, the latch 12 is unlocked. When the latch 12 is released, the bottle 8 is pulled upward in the figure in the direction of the shaft 18 by the biasing force of the spring 19a. Accordingly, the output lever 14, which is connected to the bin 8I via the first link IO, rotates counterclockwise around the shaft 15. The counterclockwise rotational force of the output lever 14 is transmitted to the movable contact 17a via the drive mechanisms 48, 49, 45, 47, etc., and is separated from the fixed contact 17b. This causes the circuit breaker to shut off.

In FIG. 3, as the bottle 8 moves, the guide FM 6a and the shaft 7 of the accumulator 6 move to the right in the figure, and rotate clockwise around the shaft 7. The back part 6a of the accumulator 6 contacts the stopper 60, and further pushes the stopper 60 against the urging force of the spring 63 to push the shaft 6
Rotate clockwise around 1. As a result, the stopper 60 separates from the roller 4, and the charge lever 2 moves away from the shaft 3.
It is possible to rotate freely around the

In order to return the breaker from the cut-off state shown in FIG. 3 to the reset state shown in FIG. 1, the charge lever 2 is further rotated clockwise from the position shown in FIG. 3.

As a result, the energy storage link 6 moves to the left in the figure against the biasing force of the spring 19, and the bottle 8 moves to the left in the figure. The latch I2 is rotated counterclockwise by the movement of the bin 8,
Tip of latch 12 &:fj12a is end 21 of intermediate latch
Press b. As a result, the intermediate latch 21 rotates clockwise against the biasing force of its biasing means (not shown).
The trigger 37 also rotates clockwise due to its biasing force (not shown) until it comes into contact with the bottle 24.

[Effects of the Invention] As described above, according to the present invention, since the charge lever 2 is prevented from rotating by the stopper 60 in the closed state where the latch 12 is locked or the reset state, the charge lever 2 The current state of the breaker can be determined by the non-rotation of the breaker. Furthermore, malfunctions caused by unnecessary operations of the operating mechanism in the reset state can be prevented.

[Brief explanation of drawings]

1, 2, and 3 are sectional views showing the structure and operation of an embodiment of the breaker operating mechanism according to the present invention,
FIG. 4 is a perspective view showing the appearance of a circuit breaker having a circuit breaker operating mechanism according to the present invention, and FIG. 5 is a sectional view showing the configuration of a conventional circuit breaker operating mechanism. In the figure, 2 is a charge lever, 6 is a storage link, 9 is a second link, IO is a first link, 12 is a latch, 14 is an output lever, 17a is a movable contact, 17b is a fixed contact,
19 is a spring, and 60 is a stopper.

Claims (1)

[Claims] (1) an output lever that is rotatably supported on a first shaft and whose one end is connected to a movable contact drive mechanism; a first link that is rotatably supported at a point on the output lever; a second link pin-coupled to the first link; rotatably supported on a second shaft; one end of the second link rotatably supported at a point on the second link; a latch which is biased with a rotational force in one direction around the shaft and whose rotational movement is locked at one end; a guide groove which is slidably fitted into the third shaft; and a power storage link rotatably pin-coupled to the pin coupling portion of the second link, one end of which is connected to the pin engagement portion of the first and second links, and attached to the pin coupling portion in one direction. a spring that applies a force, which is rotatably supported on a fourth shaft, and presses the energy storage link in one direction while the third shaft and the guide groove slide against the biasing force of the spring; a charge lever that is rotatably supported on a fifth shaft and is biased with a rotational force in one direction, and comes into contact with the energy storage link in a state in which the latch is released; a stopper that is rotated in the other direction against the biasing force by the operation of the actuator, is rotated in the one direction by the rotational force in another state, and comes into contact with the charge lever to prevent rotation of the charge lever; An operation mechanism for a cutter equipped with .