JPH0122333Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a locking device in an interlock mechanism such as a switchboard.

Generally, in the case of a switchboard, drawer-type electrical equipment such as disconnectors and disconnectors are inserted and pulled out for security and inspection purposes. Regarding this operation, while it is not possible to pull out the cutter or disconnector while it is in the closing operation (in the connected position), it is impossible to pull out the cutter or disconnector after it has been pulled out. Furthermore, an interlock mechanism for fixing the shroud breaker is provided so as to be interlocked with the closing operation mechanism of the shredder breaker.

Conventionally, as shown in FIGS. 1 and 2, this interlock mechanism is inserted between the movable core 4 and fixed core 5 of the closing operation electromagnet 3 within the main body frame 2 of the shear breaker 1. The lock pin 6 to be released is restrained to the release position by a restraining spring 7, and the body frame 2 is fixed to a lock plate 8 attached to the switchboard at the disconnection position and the connection position, respectively. Lock pin holes 9, 9 are drilled, and these lock pin holes 9, 9
When the locking pin 6 enters the locking pin hole 9, or the locking pin 6 is removed from the locking pin hole 9, 9 via the handle 10, the shield breaker 1 is activated in response to the operation of the closing operation electromagnet 3. It was configured to be interlocked.

In other words, when the movable core 4 is attracted to the fixed core 5 by energizing the closing operation electromagnet, this state means that a switch such as a vacuum interrupter is closed and the main circuit is closed. However, while the lower end of the locking pin 6 falls into the locking pin hole 9 in the connection position, the upper end contacts the lower end of the movable iron core 4 and is restricted from moving upward and fixed stationary ( (See the phantom line diagram in Figure 1).
However, when the movable core 4 separates from the fixed core 5,
The upper end of the locking pin 6 is in a movable state so that it can enter the space between the two. Therefore, when the breaker 1 is in the closing operation, the breaker 1 cannot be moved; however, when the breaker 1 is not in the closing operation, the locking pin 6 prevents the handle 10 from being moved by the hand. Lifting it up allows it to move upward, allowing the shredder 1 to be moved freely. In addition, in Figure 1,
11 is a stopper for the movable iron core 4, and 12 is a stopper for the movable iron core 4.
return spring, 13 operation handle of cutter 1,
14 indicates the bottom of the switchboard.

However, in the case of the interlock mechanism, the locking pin hole 9 at the connection position of the locking plate 8 is
It is only locked when the locking pin 6 is engaged in the locking position (on the right side of the drawing), and the locking pin 6 can be moved freely when the locking pin hole 9 is in the disconnected position (on the left side of the drawing). Therefore, the sheath cutter 1 can be moved freely. Therefore, when the shield breaker 1 is in the disconnected position, the shield breaker 1 is not connected to the earthing switch in the distribution board and is not interlocked with the earthing switch, so if the earthing switch is left closed, If the disconnector 1 was moved to the connection position, there was an extremely high risk of causing a short circuit accident.

Therefore, in this invention, the interlock mechanism is interlocked with the earthing switch, and when the locking pin 6 is engaged with the locking pin hole 9 in the disconnected position,
If the earthing switch meets certain conditions, for example, after the earthing switch has been opened, the
The interlock mechanism is improved so that it cannot be moved to the connected position.

This invention will be explained below based on the illustrated embodiment.

In FIGS. 3 to 13, the same components as those in the conventional example are designated by the same reference numerals, and redundant explanations will be omitted.

In FIG. 3, the locking pin 6 is provided with an engaging portion 15 on its outer side, and this engaging portion 15
An instantaneous adsorption type electromagnetic coil 17 equipped with a constantly protruding plunger 16 that engages and disengages with the lock switch 1
8 is attached and fixed to the main body frame 2. On the other hand, the locking pin 6 is provided with a protrusion 19 that drives the operating piece 18a of the locking switch 18. The engaging portion 15
is a recess 6a formed by cutting out a part of the locking pin 6 in the form of a long groove.
As shown in FIG. 4, an oblong hole 6b is drilled through a part of the locking pin 6, or as shown in FIG. The shaped metal fitting 6c may be secured with screws. In a state in which the plunger 16 is engaged with the engaging portion 15, the locking pin 6 can be moved slightly upward, and the upward movement causes the protruding portion
9 moves up and down to release the actuating piece 18a of the lock switch 18.
The vertical lengths of the recess 6a, the oblong hole 6b, or the metal fitting 6c are determined so as to enable the operation of the recess 6a, the oblong hole 6b, or the metal fitting 6c. On the other hand, the protrusion 19 is a chevron-shaped cam, and this chevron shape is, as shown in FIG.
The electromagnetic coil 17 is energized even after the range of 5 is exceeded. In FIG. 6, A indicates the operating range of the locking pin 6 from the lower limit to the upper limit, B indicates the length of the projection 19, and C indicates the range of the engaging portion 15. As shown in FIG. 7, such a locking device is connected in series with an appropriate power source and is interlocked with an electromagnetic coil 17, a locking switch 18, and a grounding switch, and opens when the grounding switch is turned on and opens when it is disconnected. Switch 20 to close
electrically connect them in series.

Therefore, if the earthing switch were to be opened, the switch 20 would be closed, resulting in the state shown in FIG. Therefore, if you hold the handle 10 of the lock pin 6 and move the lock pin 6 upward, the protrusion 1
9 operates the operating piece 18a to lock the lock switch 18.
Enter and operate. The actuation piece 18a has a chevron-shaped protrusion 19
While passing through, the electromagnetic coil 17 is energized, and the plunger 16 is attracted and withdrawn from the engaging portion 15. Thus, the locking pin 6 can move upward without any hindrance and is not engaged with the locking pin hole 9. The connection is released, and the shredder breaker 1 can be moved.

On the other hand, when the earthing switch is in the closed state, the switch 1 must not be moved to the connected position, but at that time the switch 20 of the circuit shown in FIG. Handle 10 of lock pin 6
Even if the plunger 16 is held and moved upward, the electromagnetic coil 17 is not energized and is not excited, so the plunger 16 is not attracted and remains engaged with the engaging portion 15. There, the engaging portion 15 and the plunger 16 collide and stop the upward movement of the locking pin 6, so the locking pin 6 cannot be disengaged from the locking plate 8. cannot be moved from the disconnected position. Therefore, in order to move the disconnector 1 from the disconnection position to the connection position, the earthing switch must be locked so that it cannot be moved unless it is opened, which significantly increases safety. do.

Next, another embodiment of this invention will be described based on FIGS. 8 and 9. In this example, a pair of flanges 21 are spaced apart and fixed to the locking pin 6 through the locking pin 6, and a tube 22 having a handle 10 and a protrusion 19 is loosely fitted between the flanges 21. Therefore, the cylinder 22 is always in contact with the lower collar body 21 due to its own weight, and is separated from the actuating piece 18a of the lock switch 18.
In addition, the plunger 16 of the electromagnetic coil 17 is engaged with the engaging portion 15 . This collar body 21 replaces the recess 6a, the oblong hole 6b, or the metal fitting 6c.

Thus, in this example, when the handle 10 is moved upward, the cylinder 22 first rises along the locking pin 6, and at this time, the actuating piece 18a is operated to close the locking switch 18. As a result, the electromagnetic coil 17 is energized and the engagement between the plunger 16 and the engaging portion 15 is released, and by raising the handle 10, the tube 22 comes into contact with the collar body 21, thereby raising the locking pin 6. and remove it from the lock pin hole 9. Therefore, since the movement of the protrusion 19 is made between the collar bodies 21 independently of the locking pin 6, the engagement part 15 should be a long groove or a long hole to allow the movement of the plunger 16. There is no need for this, and a simple circular hole is sufficient for the engaging portion 15.

In addition, in Fig. 8 and Fig. 9, the breaker 1
Even when the drawer and insertion operations are performed using a rotary drawer handle, the pin 25 is connected to the locking pin 6 so as to prevent the drawer handle (not shown) from being inserted into the handle insertion shaft 24. By protruding from the handle, the insertion of the pull-out handle is prevented, thereby interlocking the insertion and pull-out operations of the sheath cutter 1.

However, depending on the configuration of the embodiment, when the breaker 1 moves from the disconnection position to the connection position, the handle 1
When the lock pin 6 is released from the lock plate 8, the protrusion 19 closes the actuating piece 18a again or remains closed, and the electromagnetic coil 17 becomes continuously excited. There is a risk of burnout, so it is desirable to take measures to prevent this.

As this continuous excitation prevention means _, as shown in FIG. Distance between actuation piece 18a and protrusion 19
l ₂ is set so that the relationship l ₂ > l ₁ holds. Therefore, as shown in FIG. 11, when the locking pin 6 is moving on the locking plate 8, the protrusion 19 is pushed by the spring 23 and comes into contact with the lower collar body 21, so that the actuating piece 1
It is stopped at a position sufficiently distant from 8a. Furthermore, as shown in FIG. 12, the distance l ₁ between the electromagnetic coil 17 and one of the flanges 21 and the distance l ₃ between the actuating piece 18a and the other flanged body 21 satisfy the relationship l ₃ <l ₁ . Set it so that Therefore, as shown in Figure 13,
When the locking pin 6 is moving on the locking plate 8, the protrusion 19 remains stationary sufficiently above the actuating piece 18a, and does not operate the actuating piece 18a.

According to this invention described above, the following effects can be achieved.

Since the locking device can obtain an interlock that is electrically interlocked with the shield breaker 1, the earthing switch, and especially other devices, it is possible not only during the closing operation of the shield breaker 1 but also when the disconnection position Even in such a case, the locking pin 6 cannot be removed from the locking plate 8 until the preparations of other devices are completed, so the breaker 1 cannot be moved. Therefore, when the shield breaker 1 is accidentally pulled out during the closing operation of the shield breaker 1, or when the shield breaker 1 is in the disconnected position, the shield breaker 1 is connected without the earthing switch being opened. It is possible to prevent erroneous operations such as moving to a certain position, and it is possible to guarantee extremely safe and reliable operation.

Since the interlock allows the locking pin 6 to be removed and removed by an electrical signal, it has an extremely simple structure and is easy to repair and inspect, whereas the mechanical structure tends to be complicated. In addition, the cost can be kept low and it is economical.

The electromagnetic coil 17 is of an instantaneous excitation type and does not need to be of a continuous excitation type, and since the plunger 16 is detached from the engaging part 15 when excited, it attracts the engaging part 15 and the plunger 16.
Since it is not an interlock that engages with the interlock, it provides the safety and reliability of a fail-safe type in which the interlock will not be released even if a coil breakage or an abnormality in the operating power supply occurs.

Since the electromagnetic coil 17 can be of an instantaneous excitation type, a large attractive force can be obtained, a small one is sufficient, and there is almost no risk of burning out the coil itself.

If the lock switch 18 is provided externally as a push button, it is possible to push the push button with one hand and lift the handle 6e with the other hand to move the lock pin 6 upward and connect it to the lock switch 18. Since the interlock is set by electrical signals according to the state of external equipment, it is not mechanically interlocked with other equipment and can be operated arbitrarily, providing advantages that cannot be achieved with a mechanical configuration.

When a pair of flanges 21 are spaced apart and fixed to the locking pin 6, and a cylinder 22 having a handle 10 and a protrusion 19 is loosely fitted between the flanges 21, the locking device is constructed. There is no need for an engaging part that allows movement of the plunger 16 when the lock is unlocked, and a simple circular hole is sufficient. In addition, continuous excitation of the electromagnetic coil 17 is prevented, and the operation of the interlock can be checked using the chain. This can be done without moving the entire lock pin 6 upward.

This invention can be used not only for the pull-out operation type that pushes and pulls the sheath cutter 1, but also for types that allow the sheath cutter 1 to be pulled out and inserted by rotating a handle such as a gear or screw-in type. can.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main part of the conventional example, Fig. 2 is a front view taken from arrow A in Fig. 1, Fig. 3 is a side sectional view of the main part of this invented example, and Figs. 4 and 5 are the engagement FIG. 6 is an operation-related explanatory diagram showing the relationship between the engaging portion and the plunger, FIG. 7 is a circuit configuration diagram, and FIG.
13 are side views of main parts showing other examples of this invention. DESCRIPTION OF SYMBOLS 1...Shipping breaker, 2...Main frame, 3...Loading operation electromagnet, 4...Movable core, 5...Fixed core, 6
...Lock pin, 7...Suppression spring, 8...Lock plate,
9...Lock pin hole, 10...Handle, 15...Engaging portion, 16...Plunger, 17...Coil, 18
...Lock switch, 18a... Actuation piece, 19...
Protrusion, 21...guard body, 22...tube.

Claims (1)

[Scope of claims for utility model registration] [1] Lock plate 8 with lock pin holes 9, 9 drilled therein
, a locking pin 6 provided on the main body frame 2 and movable up and down, an engaging portion 15 and a projection 19 provided on the locking pin 6, and a plunger provided opposite to the engaging portion 15 and always protruding. Electromagnetic coil 1 with 16
7 and a locking switch 18 which is disposed opposite to the projection 19 and has a normally open contact, and the electromagnetic coil 17, the contact of the locking switch 18, and the switch 20 of the earthing switch are electrically connected in series. A locking device characterized by: [2] The locking pin 6 is fixed through a pair of flanges 21 separated from each other, and a tube 22 is loosely fitted into the locking pin 6 between the flanges 21, and a handle 10 is attached to the tube 22. The locking device according to claim 1, characterized in that the locking device comprises a projection 19 and a protrusion 19.