KR101279893B1 - Withdrawable device for vacuum cirvuit breaker - Google Patents

Abstract

The present invention relates to a drawer device of a vacuum circuit breaker. The present invention is a pull-out handle for rotating the lead screw is a body that the user grips to transfer the force, the boss is slidably coupled to the body to transfer the force to the lead screw, and provided between the body and the boss Since the boss is made of an elastic member that elastically supports the body, even if the user does not recognize the interlock state of the breaker and pushes the push block with excessive force to insert the operation handle into the lead screw, the force pushing the push block is applied to the elastic member. Since it is not absorbed and delivered to the pushblock, it is possible to prevent the pushblock from being deformed by excessive push load.

Description

Drawer in and out of vacuum breaker {WITHDRAWABLE DEVICE FOR VACUUM CIRVUIT BREAKER}

The present invention relates to a drawer device of a vacuum circuit breaker.

In general, a vacuum circuit breaker is a protective device that rapidly cuts off a power system in the event of a fault in the power system, in addition to carrying out a power interruption, transfer, and stop of the power using a vacuum interrupter as a medium. That is, the vacuum circuit breaker serves to protect circuits and devices by rapidly discharging and arcing arc products generated during the opening and closing of a normal load and blocking the fault current in a vacuum container.

The vacuum breaker usually consists of a cradle, breaker body, carriage and auxiliary devices. Here, the carriage is integrally coupled with the breaker body and includes various mechanisms to selectively move the breaker body to the cradle.

In order for the vacuum circuit breaker to operate, the circuit breaker body must be put into electrical connection with the cradle. In other words, the carriage of the vacuum circuit breaker is completely moved toward the cradle and the contact points of the circuit breaker main body integrally coupled to the front of the carriage must be completely bound to the cradle to perform the closing operation. However, if the carriage is pulled in or out while the vacuum breaker is being inserted, a serious safety accident or damage to the device may occur. Therefore, a separate pull-out prevention device is required to prevent the carriage from being pulled in / out during the vacuum breaker. .

1 is a perspective view illustrating a conventional vacuum circuit breaker, FIG. 2 is a perspective view illustrating a carriage and an operation handle in FIG. 1, and FIG. 3 is a plan view illustrating a process of drawing out a carriage using the operation handle according to FIG. 2.

As shown in FIG. 1, a conventional vacuum circuit breaker is provided with a cradle 5 in a switchboard for managing various electric devices for operation or control of a power plant, a substation, or an electric motor. And the circuit breaker main body 6 is loaded on the carriage 1 which is selectively coupled to the cradle 5 is detachably housed in the cradle (5). The carriage 1 is provided with a plug interlock device, a mecha interlock device, and an earthing interlock device for preventing the breaker main body 6 from being drawn in by a user's mistake.

As shown in FIG. 2, the carriage 1 is disposed to move in a forward and backward direction with respect to a girder assembly 2 selectively coupled to the lower end of the cradle 5, and the carriage and the girder assembly Both ends of the lead screw 3 for varying the distance between the carriage 1 and the girder assembly 2 are respectively coupled between (2).

The girder assembly 2 has a front plate 21 which is elongated in a rectangular shape, and has a predetermined height at a rear side of the front plate 21, that is, a side opposite to the carriage 1. A plurality of sliding plates 22 which are arranged to slide left and right on both left and right sides of the fixed plate 23, and a fixed plate 23 fixedly installed between the two sliding plates 22 and rotatably coupled to the lead screw. And a push block 24 elastically supported by the fixing plate 23 and provided with the lead screw 3 so as to be movable in the longitudinal direction of the lead screw 3, and the front plate 21; Both ends are fixed between the fixing plate 23 and the guide pin 25 to which the push block 24 is slidably coupled to the fixing plate 23 is inserted into the outer circumferential surface of the guide pin 25 to loosen the fixing plate 23 and the push pin. The blocking block 26 is provided between the sea blocks 24 and elastically supports the push block 24 with respect to the fixing plate 23.

Here, a handle insertion hole 211 is formed at the center of the front plate 21 to insert a pull-out handle (hereinafter, abbreviated as manipulation handle) 4 for rotating the lead screw 3. . The inner circumferential surface of the handle insertion hole 211 is inserted with a key 46 provided in the operation handle 4 to block rotation of the operation handle 4 to block rotation of the lead screw 3. At least one (two in the figure) key recesses 212 are formed.

The operation handle 4 is bent in a U-shape so that the user can easily transmit the rotational force of the body 41 is formed. One end of the body 41 is formed with a gripping portion 42 that is gripped by one hand of the user, the stopping portion of the body 41 is formed by the transfer portion 43 to hold the other hand of the user to transmit the rotational force do. And the other end of the body 41 is formed with a biased portion 44 to rotate the lead screw (3). The biasing portion 44 is formed of a rigid body so that the biasing groove 45 is formed in a shape corresponding to the biasing protrusion 31 so that the biasing protrusion 31 of the lead screw 3 is inserted into the center of the front end face thereof.

In the drawings, reference numeral 241 denotes a first push plate and 242 denotes a second push plate.

In the conventional vacuum circuit breaker as described above, the user moves the breaker body toward the cradle as follows.

That is, the user applies the operation handle 4 to the first push plate 241 of the push block 24 to apply the external force F in the direction of the arrow. Then, the push block 24 is pushed by a predetermined depth toward the cradle 5, that is, the rear side. Then, while the key 46 of the operation handle 4 is released from the key groove 212 of the front plate 21, the operation handle 4 can be inserted into the lead screw 3, and at the same time, the The lead screw 3 is released from the push block 24 and the lead screw 3 is free. Then the operation handle 4 can be fitted to the ridge protrusion 31 of the lead screw 3 and the user can rotate the operation handle 4 to rotate the lead screw (3). Then, the carriage 1 engaged with the lead screw 3 is pushed toward the cradle 5 to complete the drawing operation.

However, in the conventional vacuum circuit breaker as described above, in order to safely insert the circuit breaker main body 6, the operation handle 4 must be inserted in a state where the respective interlock devices (not shown) are released. This can be smoothly retracted back so that the push block 24 is not subjected to an excessive load so that the breakage of the push block 24 can be prevented. However, if the user pushes the push block 24 excessively to forcibly insert the operation handle 4 into the lead screw 3 while the interlock devices are not terminated due to the lack of understanding or misunderstanding of the user, the push block 24 3) the first push plate 241 may be bent, as shown in FIG. 3, and thus, the push block 24 may be inoperable, thereby preventing the breaker body 6 from being drawn in. there was.

An object of the present invention, even when trying to insert the operation handle in the lead screw in the interlock state of the vacuum circuit breaker to prevent excessive load to be transmitted to the push block to prevent the push block deformed by the push load in advance It is to provide a drawer device of a circuit breaker.

In order to achieve the object of the present invention, a cradle; A breaker body electrically connected to or separated from the cradle; A carriage on which the breaker body is loaded; A girder assembly selectively secured to the cradle; A lead screw coupled between the carriage and a girder assembly to allow the breaker body to be inserted or released as the carriage moves relative to the cradle; And a pull-out handle for rotating the lead screw, wherein the pull-out handle includes: a body which the user grips to transmit rotational force; A boss slidingly coupled to the body in a longitudinal direction; And an elastic member provided between the body and the boss to elastically support the boss to the body, wherein the body has a pin fixing hole into which the anti-rotation pin is inserted, and the boss is fixed to the pin fixing hole. Provided is a draw-out apparatus for a vacuum circuit breaker, in which a pin sliding hole supporting a rotation preventing pin in a circumferential direction is formed long in a longitudinal direction.
Cradle; A breaker body electrically connected to or separated from the cradle; A carriage on which the breaker body is loaded; A girder assembly selectively secured to the cradle; A lead screw coupled between the carriage and a girder assembly to allow the breaker body to be inserted or released as the carriage moves relative to the cradle; And a pull-out handle for rotating the lead screw, wherein the pull-out handle includes: a body which the user grips to transmit rotational force; A boss slidingly coupled to the body in a longitudinal direction; And an elastic member provided between the body and the boss to elastically support the boss to the body, and formed in an angular shape along the circumferential direction so that the outer circumferential surface of the body and the inner circumferential surface of the boss engage each other. Provided is a drawout device for a vacuum circuit breaker in which rotational force is transmitted to a boss.

Withdrawal device of the vacuum circuit breaker according to the present invention, even if the user does not recognize the interlock state of the circuit breaker and pushes the push block with excessive force to insert the operation handle into the lead screw is provided with a force pushing the push block on the operation handle. Since the absorbed by the elastic member is not delivered to the push block it can be prevented that the push block is deformed by the excessive push load.

1 is a perspective view showing a conventional vacuum circuit breaker,
Figure 2 is a perspective view of the carriage and the operation handle in Figure 1,
3 is a plan view illustrating a process of drawing out a carriage using the operation handle of FIG. 2;
Figure 4 is a perspective view of the carriage and the operation handle according to the present invention,
5 is an exploded perspective view illustrating the operation handle of FIG. 4;
6 is a perspective view of the operation handle according to Figure 5 assembled;
7 is a cross-sectional view showing an exploded end of the operation handle according to FIG. 6;
8 is a plan view illustrating a process of drawing out a carriage using an operation handle in an interlock release state in the vacuum circuit breaker according to FIG. 1;
FIG. 9 is a plan view illustrating the operation handle when the carriage is drawn out using the operation handle in the interlocked state in the vacuum circuit breaker according to FIG. 1; FIG.

The draw-out device of the vacuum circuit breaker according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

Figure 4 is a perspective view of the carriage and the operation handle according to the present invention, Figure 5 is a perspective view showing the operation handle according to Figure 4 disassembled, Figure 6 is a perspective view of the operation handle according to Figure 5 assembled, Figure 7 6 is a cross-sectional view illustrating one end of the operation handle of FIG. 6 disassembled.

Referring to FIG. 1, the vacuum circuit breaker according to the present invention is mounted on a cradle 5 provided in a switchboard and a carriage 1 selectively coupled to the cradle 5 to be detachably attached to the cradle 5. And a breaker body 6 that is housed therein.

As shown in FIG. 4, the carriage 1 is arranged to move in the front-rear direction with respect to the girder assembly 2 which is selectively coupled to the lower end of the cradle 5, and the carriage and the girder 1. Both ends of the lead screw 3 for varying the distance between the carriage 1 and the girder assembly 2 are respectively coupled between the assemblies 2.

The carriage 1 is provided with a plug interlock device 7, a mecha interlock device 8, an earthing interlock device 9, and the like for preventing the breaker main body 6 from being drawn in by a user's mistake. In addition, a push locking bar 243 in which pushing operation is selectively limited by the plug interlock device 7 and the mecha interlock device 8, and a push earthing bar in which pushing operation is selectively limited by the earthing interlock device 9 are provided. 244 are respectively coupled to both rear sides of the second push plate 242 which will be described later. In addition, grooves are formed in the push racking bar 243 at regular intervals so that the plug interlock device 7 and the mecha interlock device 8 can be forcibly fixed to the position of the groove. In addition, the push earthing bar 244 may be interlocked according to the left and right positions of the earthing interlock device 9 using the length of the overall length.

The girder assembly 2 has a front plate 21 which is elongated in a rectangular shape, and has a predetermined height at a rear side of the front plate 21, that is, a side opposite to the carriage 1. A plurality of sliding plates 22 which are arranged to slide left and right on both left and right sides of the fixed plate 23, and a fixed plate 23 fixedly installed between the two sliding plates 22 and rotatably coupled to the lead screw. And a push block 24 elastically supported by the fixing plate 23 and provided with the lead screw 3 so as to be movable in the longitudinal direction of the lead screw 3, and the front plate 21; Both ends are fixed between the fixing plate 23 and the guide pin 25 to which the push block 24 is slidably coupled to the fixing plate 23 is inserted into the outer circumferential surface of the guide pin 25 to loosen the fixing plate 23 and the push pin. The blocking block 26 is provided between the sea blocks 24 and elastically supports the push block 24 with respect to the fixing plate 23.

Here, the front plate 21 is formed shorter than the length of the sliding plate 22, the pull-out handle for rotating the lead screw (3) in the center of the front plate 21 (hereinafter, abbreviated as operation handle The handle insertion hole 211 is formed to insert the 4). The inner peripheral surface of the handle insertion hole 211 is inserted into the key (211) provided in the operation handle 4 to block the rotation of the operation handle 4 to block the rotation of the lead screw (3) At least one (two in the figure) key recesses 212 are formed.

Position protrusions 221 protrude from the outer ends of the sliding plate 22 so as to be inserted into position grooves (not shown) of the cradle 5, respectively, that is, one side surface of the sliding plate 22, that is, the carriage. On the surface opposite to (1), a position spring (not shown) for pulling the respective sliding plates 22 toward the side wall surface of the cradle 5 is provided. On the other side of the sliding plate 22, a handle 222 is formed to pull the sliding plate 22 inward when each sliding plate 22 is separated from the cradle 5.

The push block 24 is formed by integrally coupling the first push plate 241 and the second push plate 242 at a predetermined interval in the front-rear direction. A sliding hole 245 is formed in the first push plate 241 to insert the ridge protrusion 31 of the lead screw 3, and the second push plate 242 rotates the lead screw 3. The anti-rotation hole 246 is formed in an angled shape (in the figure, a hexagonal shape) so that the prevention protrusion 32 is inserted.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

Reference numeral 33 in the figure is a rotational transfer portion coupled to the carriage is coupled to the lead screw carriage.

In the vacuum circuit breaker according to the present invention as described above, the breaker body 6 is drawn out from the cradle (5), that is, the user in the state in which the carriage 1 is in close contact with the girder assembly (2) ) Is moved to the cradle (5) as follows.

FIG. 8 is a plan view illustrating a process of drawing out a carriage using an operation handle in an interlock release state of the vacuum circuit breaker according to FIG. 1, and FIG. 9 is a view of an operation handle in an interlock state of the vacuum circuit breaker according to FIG. 1. This is a plan view showing the operation handle when drawing the carriage in and out.

First, the user moves the carriage 1 and the girder assembly 2 to the retract ready position. Then, the user pulls both handles 222 provided on the sliding plate 22 of the girder assembly 2 inward so that the sliding plate 22 wins the position spring and gathers inward. And when the position protrusion 221 provided on the outside of the sliding plate 22 to release the handle 222 at a position corresponding to the position groove (not shown) of the cradle 5, the position spring is restored while the The position protrusion 221 of the sliding plate 22 is inserted into and coupled to the position groove of the cradle 5.

Next, the user inserts the operation handle 4 into the handle insertion hole 211 of the front plate 21 and pushes the front surface of the first push plate 241 to the rear side. The push block 24 is then pushed back a certain depth. Then, while the key 423 of the operation handle 4 to be described later is out of the key groove 212 of the front plate 21, the operation handle 4 can be inserted into the lead screw 3, and at the same time, The anti-rotation protrusion 32 of the lead screw 3 is released from the anti-rotation hole 246 of the push block 24 and the lead screw 3 is free. Then the operation handle 4 can be fitted to the ridge protrusion 31 of the lead screw 3 and the user can rotate the operation handle 4 to rotate the lead screw (3). Then, the carriage 1 engaged with the rotation transfer part 33 of the lead screw 3 is pushed toward the cradle 5 to complete the pulling operation.

However, even though the interlock devices 7, 8, 9 provided in the carriage 1 are not in the state of being released from the interlock, the user misinterprets or misjudges them to the operation handle 4 to introduce the breaker main body 6. The push block 24 may be forcibly pressurized. Then, as described above, the push block 24 may be deformed and the draw-out operation itself may be impossible while the push block 24 receives an excessive push load in the interlocked direction. The present invention is to provide an operation handle that can prevent the push block from being deformed by excessive push load by preventing the pushing force from being transmitted to the push block even if the user presses the push block with the operation handle in the interlock state.

To this end, the operation handle 4 according to the present embodiment is a body 410 that the user grips and transmits a force, and the boss slidably coupled to the body 410 to transfer the force to the lead screw (3) 420 and an elastic member 430 provided between the body 41 and the boss 420 to elastically support the boss 42 to the body 410.

The body 410 is bent a steel bar having a predetermined length is formed with a first gripping portion 411 and a second gripping portion 412. The first gripper 411 is positioned on the same line as the boss 420, and the second gripper 412 is bent to be parallel to a rotation center line connecting the boss 420 and the first gripper 411. do. As the second gripper 412 rotates about the first gripper 411, the second gripper 412 inserts a rotary knob 413 such as a coil spring as the second gripper 412. It may be desirable during the rotation of 412.

A sliding part 415 is stepped at the end of the body 410, that is, the opposite end of the first gripping part 411 so that the boss 420 is slidably inserted. The bolt fastening hole 416 is coupled to the end surface of the sliding part 415 so that the boss support bolt (hereinafter, the support bolt) 440 for supporting the boss 420 is coupled to the body 410. 410 is formed in the longitudinal direction. In addition, a pin fixing hole 417 to which the anti-rotation pin 450 to be described later is coupled is formed in the sliding part 415 of the body 410 so as to prevent the boss 420 from rotating. .

The boss 420 is formed in a tubular shape of which both ends are opened, and the inner circumferential surface of the boss 420 is formed with an angular shape so as to correspond to the ridge protrusion 31 of the lead screw 3. . In addition, a support surface 422 is formed on the inner circumferential surface of the boss 420 so as to be supported in the elastic direction of the elastic member 430 by the head or washer of the support bolt 440. In addition, the boss 420 is formed with a key 423 to be inserted into the key groove 212 of the front plate 21 on the outer peripheral surface of the front end thereof. A pin sliding hole 424 is formed in the middle of the boss 420 to correspond to the pin fixing hole 417. The pin sliding hole 424 is formed by a predetermined length so that the anti-rotation pin 450 coupled to the pin fixing hole 417 of the body 410 can perform a longitudinal sliding movement of the boss 420. do.

The elastic member 430 has a predetermined elastic force and the maximum compression length is compressed to have a length such that the support bolt 440 and the lead screw 4 can be contacted at least in the interlock state of the circuit breaker main body 6. It is formed of a coil spring. One end of the elastic member 430 is supported on the cross section forming the sliding portion 415 of the body 410 while the other end is supported on one side of the boss 420.

On the other hand, as shown in the figure, the outer circumferential surface of the sliding portion 415 of the body 410 and the inner circumferential surface of the boss 420 may be formed in an angular shape to correspond to each other. In this case, the body 410 and the boss 420 does not need to be provided with a separate anti-rotation pin 450 to prevent relative rotation can reduce the material cost and assembly cost.

A process of introducing the circuit breaker main body using the operation handle according to the present embodiment as described above is as follows.

That is, as shown in FIG. 8, a state in which the breaker main body 6 can be inserted into the cradle 5, that is, the plug interlock device 7, the mecha interlock device 8, and the earthing interlock device 9 are interlocked. In the released state, when the user inserts the operation handle 4 into the handle insertion hole 245 of the front plate 21 and pushes the first push plate 241, the height at which the operation handle 4 advances to the rear side. The push block 24 is moved to the rear side by (h). Then, the key 423 of the boss 420 of the manipulation handle 4 is released from the key groove 212 provided in the handle insertion hole 211 of the front plate 21 and the rotation of the lead screw 3 is performed. The preventing protrusion 32 is out of the rotation preventing hole 246 of the first push plate 241. Then, the ridge protrusion 32 of the lead screw 3 is released from the push block 24 so that the user can insert the ridge protrusion 32 of the lead screw 3 into the brace groove 421 of the operation handle 4. It becomes possible. Then, the user rotates the lead screw 3 by using the first holding portion 411 and the second holding portion 412 of the operation handle (4). The breaker body 6 is then retracted while the carriage 1 coupled to the lead screw 3 moves towards the cradle 5.

On the other hand, as shown in Fig. 9, the circuit breaker body 6 cannot enter the cradle 5, that is, the interlock device 7, the mecha interlock device 8, and the earthing interlock device 9 are interlocked. In this state, even if the user tries to couple the biasing protrusion 31 to the biasing groove 421 by inserting the operation handle 4 into the handle insertion hole 211 of the front plate 21, the push block 24 moves to the rear side. You will not move. Then, the pressing force applied by the user to the manipulation handle 4 is absorbed by the elastic member 430 provided between the body 410 and the boss 420, and the elastic member 430 is compressed, so that the manipulation handle 4 The boss 410 of the body 410 does not move forward toward the rear of the carriage 1, the sliding portion 415 of the body 410 is slipped on the boss 420, only the body 410 rear by the compression distance (h) of the spring You will move forward. At this time, the head of the support bolt 440 that couples the body 410 and the boss 420 is in contact with the viscous protrusion 31 of the lead screw (3) the user pushes the force through the support bolt 440 It is delivered to the caster portion 31. Accordingly, even if the user does not recognize the interlock state of the breaker and pushes the push block 24 with excessive force in order to insert the operation handle 4 into the lead screw 3, the force pushing the push block 24 is elastic. Since the member 430 is not transmitted to the push block 24, the push block 24 may be prevented from being deformed by excessive push load.

1: carriage 2: girder assembly
21: front plate 22: sliding plate
23: fixing plate 24: push block
241: first push plate 242: second push plate
25: guide pin 26: spring
3: lead screw 31: fine protrusion
4: operation handle 410: body
411: first gripper 412: second gripper
413: handle 415: sliding portion
416: bolt fastening hole 417: pin fixing hole
420: Boss 421: Gase home
422: support surface 423: key
424: pin sliding hole 430: elastic member
440: support bolt 450: anti-rotation pin

Claims (7)

Cradle;
A breaker body electrically connected to or separated from the cradle;
A carriage on which the breaker body is loaded;
A girder assembly selectively secured to the cradle;
A lead screw coupled between the carriage and a girder assembly to allow the breaker body to be inserted or released as the carriage moves relative to the cradle; And
And a pull-out handle for rotating the lead screw.
The pull-out handle is,
A body which the user grips to transmit the rotational force;
A boss slidingly coupled to the body in a longitudinal direction; And
An elastic member provided between the body and the boss to elastically support the boss to the body;
The pin fixing hole into which the anti-rotation pin is inserted is formed in the body, and the pin-slip hole supporting the anti-rotation pin fixed to the pin fixing hole in the circumferential direction is formed in the boss. Device. delete delete Cradle;
A breaker body electrically connected to or separated from the cradle;
A carriage on which the breaker body is loaded;
A girder assembly selectively secured to the cradle;
A lead screw coupled between the carriage and a girder assembly to allow the breaker body to be inserted or released as the carriage moves relative to the cradle; And
And a pull-out handle for rotating the lead screw.
The pull-out handle is,
A body which the user grips to transmit the rotational force;
A boss slidingly coupled to the body in a longitudinal direction; And
An elastic member provided between the body and the boss to elastically support the boss to the body;
Drawer device of the vacuum circuit breaker is formed in an angular shape along the circumferential direction so that the outer peripheral surface of the body and the inner peripheral surface of the boss is in engagement with each other. The method according to claim 1 or 4,
A boss support member is coupled to one end surface of the body to support the boss in the elastic direction of the elastic member by walking the inner circumferential surface of the boss.
And said elastic member comprises a compression coil spring having a maximum compression length such that said boss support member and said lead screw are at least in contact with said breaker body in an interlock state. The method of claim 5, wherein the girder assembly,
A plurality of sliding plates provided on a surface opposite to the side surface of the carriage and arranged to slide left and right with respect to an entry direction of the lead screw;
A fixed plate fixedly installed between the two sliding plates and rotatably coupled to the lead screw; And
And a push block elastically supported by the fixing plate and penetrated by the lead screw to be movable in the longitudinal direction of the lead screw.
The push block draw-out device of the vacuum circuit breaker is formed in the anti-rotation hole is engaged with the lead screw to prevent rotation of the lead screw. The method according to claim 6,
The girder assembly is further provided with a front plate provided on the front side of the push block,
The front plate is formed with a handle insertion hole so that a part of the draw-out handle can be inserted,
A key breaker is formed in the inner circumferential surface of the handle insertion hole while a key (key) is formed in the outer circumferential surface of the pull-out handle to be inserted into the key groove.

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