JP2538674Y2 - Controller for circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a circuit breaker operating device such as a power circuit breaker for switching a high voltage and a large current.

[Conventional technology]

Generally, in a power circuit breaker, an air operation device using compressed air, a spring operation device using the stored energy of a spring, a hydraulic operation device, or the like is used as an operation device for driving the interruption portion at high speed. ing.

For example, FIGS. 3 to 6 show an electric spring actuator, which will be used to explain the prior art.

In FIG. 3, when a cam (3) is rotated by a motor (1) via a first reduction mechanism (2), a ratchet mechanism (4) having a cam follower is reciprocated and converted into a small rotational motion. This rotational force is transmitted to the main shaft (6) via the second speed reduction mechanism (5) including the clutch mechanism, and the main shaft (6) rotates.

A crank (7) is attached to each end of the main shaft (6), and a closing spring (10) is provided between the crank pin (8) and a fixing pin (9) of the actuator frame. ), The closing spring (10) is gradually charged through the crank (7), and when the crank pin (8) passes through the top dead center, the main shaft (6) is charged by the stored force of the closing spring (10). Tries to rotate rapidly.

A pair of drive cams (11) is axially mounted on the middle part of the main shaft (6), and a roller (12) is supported between the two cams (11). Input locking pin (1
Roller (1) is applied to the closing latch lever (14) locked to 3).
2) abuts, rotation of the main shaft (6) is prevented, and the charged state of the closing spring (10) is maintained.

The lever (15) rotatably supported on the main shaft (6) is a lever (18) supported on the auxiliary shaft (16) and supporting the roller (17).
, And further connected to a relay shaft (19) via a lever and a link.

FIG. 4 shows a cut-off state. When a closing command is issued in this state, the closing coil (20) shown in FIG. 3 is excited, and the closing lock pin (13) is turned through the closing lever (21). The closing operation of the closing latch lever (14) is released when the closing lever is released from the roller (12), and the main shaft (6) is moved counterclockwise in FIG. 4 by the accumulated force of the closing spring (10). It turns rapidly.

Therefore, the drive cam (11) integrated with the main shaft (6) hits the roller (17) of the lever (18) to rotate the auxiliary shaft (16) clockwise, and the relay shaft (19) via the lever and link. )
Is rotated counterclockwise.

The rotation of the relay shaft (19) is transmitted to the output shaft (24) via the lever and the two links (22) and (23), and the output shaft (24) rotates counterclockwise to shut off. The part (25) is turned on, and the shut-off spring (26) is charged by this rotating power.

FIG. 5 shows this closed state. At this time, the output shaft (24) is rotated and urged clockwise by the accumulated force of the shut-off spring (26). The roller at the connection point of (2) engages with the latch (27) for closing and holding, and the link (28), (29), (30) and the connection lever (3)
Since the release latch lever (32) connected via 1) is locked to the release lock pin (33), the rotation of the output shaft (24) is prevented, and the closed state is maintained.

When the above-described closing operation is completed, the motor (1) is driven by a limit switch (not shown) that detects the release of the closing spring (10), and the above-described closing spring (10) is charged, and the next closing is performed. Prepare for operation.

Next, in the closed state of FIG. 5, when a trip command is issued, the trip coil (34) is excited and the half-moon trip lock pin (33) is rotated counterclockwise to pull The latched state of the release latch lever (32) is released, and this rotates counterclockwise.

Therefore, the trip latch lever (32) and the output shaft (2
4) Link (30), (2)
9), (28) and the connecting lever (31) are operated as shown in FIG. 6, and the connecting point of the links (22) and (23) is also disengaged from the closing / holding latch (27) and the output shaft (24). Is turned clockwise by the release of the blocking spring (26) to block the blocking portion (25).

After the completion of the shut-off operation, the holding mechanism moves the return spring (3
5) and (36), it is operated in the direction of the arrow in FIG. 6 to return, and the tripping latch lever (32) hits the stopper (37) to be in the shut-off state in FIG.

In addition, (38) is an operation device frame, (39) is an auxiliary switch, and (40) is an operation buffer connected to the output shaft (24) via a lever.

[Problems to be solved by the invention]

As described above, in the circuit breaker operating device, since a part having a considerable mass moves at a high speed at the time of its operation, it is usual that the shock is absorbed by the shock absorber (40) at the stroke end.

On the other hand, among the operation responsibilities of the circuit breaker, there is a duty of O-0.35 sec-CO for high-speed reclosing.

This means that after the shut-off operation, the closing operation is performed again after 0.35 seconds, and each link component of the actuator must return so that the next closing operation can be performed within 0.35 seconds after the shut-off operation .

For this reason, the return springs (35) and (36) for returning the members of the shut-off spring holding mechanism need to be considerably strong springs.

However, if the return springs (35) and (36) are made strong as described above, the impact when the link returns and hits the stopper increases, and in the above-mentioned example, the tripping latch lever (32) is The impact is large when it returns quickly and comes into contact with the stopper (37), which may damage the latch lever (32) or the stopper (37) and other parts.

The shock absorber (40) is used for buffering the operation of the breaker body, and usually has no buffer effect when the link is restored.

Here, in order to reduce the above-described impact at the time of return, for example, as shown in FIG. 7A, it is conceivable to provide a cushion material (41) such as rubber on the outer periphery of the stopper (37).

However, it is not preferable to use a dimensionally unstable member such as a cushioning material (41) for this type of operating device that requires a delicate positional relationship in dimension. For example, as shown in FIG. Further, when the cushion material (41) is deformed, the return position of the trip latch lever (32) changes, and the direction of action of the force lines changes, so that a problem arises in that normal operation cannot be expected.

The present invention has been made in consideration of such problems of the prior art.
It is an object of the present invention to provide a circuit breaker operating device that can reduce the impact of a return spring when returning a link or the like.

[Means for solving the problem]

To achieve the above object, the circuit breaker operating device of the present invention is connected to an output shaft from a trip latch lever through a connecting member such as a connecting lever and a link, and is turned on and off by turning the output shaft. A release mechanism provided on the output shaft via a lever, and a release and release operation buffer provided on the output shaft via a lever; and a trigger for releasing the release latch lever to release the retention state of the retention mechanism. A trigger mechanism for causing the output shaft to be turned on and off by rotation of the output shaft by the operating force; a return spring for returning the connecting member to the holding state; A circuit breaker operating device comprising a stopper for restricting a return position of the connecting member, wherein the operating member is located near the connecting lever, and is near a final stroke of a return stroke of the connecting lever by the return spring. In, and immediately before the tripping latch lever abuts against the stopper, is provided with a return damper for imparting cushioning force to the coupling lever.

[Action]

The circuit breaker operating device of the present invention configured as described above,
When the connecting member such as a lever and a link constituting the holding mechanism is returned by the return spring after the closing and releasing operations performed by releasing the holding state of the holding mechanism, the connecting lever connected to the release latch lever. The connecting lever abuts immediately before the release latch lever abuts the stopper against the return damper provided in the vicinity of, and the buffering force is applied to the release latch lever by the return damper. The impact at the time of contacting the stopper is reduced.

〔Example〕

 An embodiment will be described with reference to FIG. 1 and FIG.

In these drawings, the same symbols as those described above denote the same or corresponding elements, and the difference from the prior art is that in the shut-off spring holding mechanism for holding the stored force of the shut-off spring (26), the connecting lever (31) Opposed to the end on the trip latch lever (32) side, this is the point that a return damper (42) is provided which comes into contact immediately before the trip latch lever (32) comes into contact with the stopper (37).

Then, the tripping coil (34) is excited from the closed state,
When the trip lock lever (32) is released by turning the trip lock pin (33) counterclockwise, the links (30), (29), (28), (28) 23) and the output shaft (24) becomes rotatable via the connecting lever (31),
This rotates clockwise due to the accumulated force of the blocking spring (26), and blocks the blocking portion (25).

After completion of this shut-off operation, links (22), (23), (2)
8) to (30), the connecting lever (31) and the release latch lever (32) are returned in the direction of the arrow in FIG. 2 by return springs (35) and (36), respectively. The connection lever (31) abuts on the damper (42) in the vicinity, and a buffering force is applied, so the shock when the release latch lever (32) immediately thereafter hits the stopper (37) is greatly reduced, and it returns. The state shown in FIG. 1 is obtained without causing any damage to the member due to the impact at that time.

The damper (42) may be of a relatively small size, unlike the shock absorber for operation (40).

[Effect of the invention]

Since the present invention is configured as described above,
The following effects are obtained.

When a connecting member such as a lever or a link is returned by a return spring, a connecting damper provided near the connecting lever connected to the releasing latch lever is connected to the connecting lever immediately before the releasing latch lever comes into contact with the stopper. Abuts and a buffering force can be applied to the release latch lever by the return damper, so that the impact at the time of contact with the stopper can be reduced,
Damage to members due to impact can be prevented.

[Brief description of the drawings]

1 and 2 show an embodiment of the circuit breaker operating device according to the present invention, FIG. 1 is a cut-away front view in a cut-off state, FIG. 2 is a cut-away front view at the time of link return, and FIG. FIG. 3 is a perspective view, FIG. 4, FIG. 5 and FIG. 6 are cut-away front views of a cut-off state, a closed state and a link return state, respectively, and FIGS. It is each a partial front view. (23), (28) to (30) ... link, (31) ... connecting lever, (32) ... trip latch lever, (33) ... trip lock pin, (35), (36) ) …… Return spring, (37) ……
Stopper, (42) ... Return damper.

Claims (1)

(57) [Scope of request for utility model registration] 1. A holding mechanism connected to an output shaft from a trip latch lever via a connecting member such as a connecting lever or link, and a holding mechanism for holding an operation force of closing and tripping by rotation of the output shaft; An input / exit operation buffer provided on the shaft via a lever; and a trigger for the release latch lever to release the holding state of the holding mechanism, and the rotation of the output shaft by the operating force. A trigger mechanism for performing the closing and releasing operations of the above, a return spring for returning the connecting member to the position of the holding state, and a stopper for abutting the releasing latch lever to regulate the returning position of the connecting member. The operating device for a circuit breaker provided, wherein the tripping latch lever is located near the connecting lever, near the final position of the returning stroke of the connecting lever by the return spring, and Just before contact with the Tsu path, breaker operating device, characterized in that a return damper for imparting cushioning force to the coupling lever.