JP2019169335A - Operation mechanism of vacuum circuit breaker - Google Patents

Abstract

To provide an operation mechanism of a vacuum circuit breaker, capable of reducing a device cost.SOLUTION: An operation mechanism of a vacuum circuit breaker, comprises: a valve driving part 3 performing an input operation and a blocking operation of vacuum valves VA, VB, and VC; a switch axis 5 transmitting the input and blocking operations to the valve driving part; a cam 22 fixed to a cam axis; a driving lever 7 projected to the cam side while being fixed to the switch axis; a cam and driving lever communication part transmitting a rotational operation of the cam to the driving lever; an input spring 24 making the switch axis to rotate in a direction of the input operation; and a blocking spring 9 making the switch axis to rotate in the direction of the blocking operation. The cam and driving lever communication part comprises: a relay lever 8 swinging around a swinging axis 8a; and relay rollers 8b and 8c contacted to one part of the cam and the driving lever. The rotational operation of the cam is transmitted as a rotation operation of the driving lever by oscillation of the relay lever by via each relay roller.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an operating mechanism for a vacuum circuit breaker.

The operation mechanism of the vacuum circuit breaker is a device that drives the movable contact of the vacuum valve to the closing position and the opening position in response to an on / off command.
As an operation mechanism of this vacuum circuit breaker, for example, an apparatus disclosed in Patent Document 1 is known.
Patent Document 1 discloses a valve drive unit that is connected to a movable contact of a vacuum valve to perform a closing operation (main contact is closed) and a shut-off operation (main contact is opened) of the vacuum valve; The valve drive unit is connected to the valve drive unit via an open / close lever, and an open / close shaft that transmits the closing / closing operation to the valve drive unit by rotation, a cam that is fixed to the cam shaft, and a cam that is fixed to the open / close shaft and protrudes toward the cam side. A drive lever, a cam / drive lever interlocking portion that transmits the rotational movement of the cam to the drive lever, and a closing spring that transmits a turning force (throwing force) in the closing direction to the cam via the cam shaft. Yes.

  Here, as a specific structure of the cam / drive lever interlocking portion, for example, a structure in which the cam is rotated by the relay lever and the movement of the relay lever is transmitted as a rotational motion to the opening / closing shaft via the drive lever. Are known. In this case, the relay lever is generally connected to the cam and the drive lever with a rod.

Japanese Patent No. 3454040

However, as the above-mentioned cam / drive lever interlocking unit, the structure in which the relay lever is connected to the cam and the drive lever with the rod is connected to the cam and the relay lever, and the other rod is connected to the relay lever and the drive lever. Since the number of assembling steps such as a process to be performed increases, there is a problem in terms of apparatus cost.
Therefore, the present invention is a vacuum circuit breaker operation that can reduce the cost of the apparatus by adopting a simple cam / drive lever interlocking part structure that does not require assembly of connecting the cam and the drive lever and the rod. The purpose is to provide a mechanism.

  In order to achieve the above object, an operating mechanism of a vacuum circuit breaker according to an aspect of the present invention includes a valve driving unit that performs connection / blocking operation of a vacuum valve by being connected to a movable contact of the vacuum valve, and valve driving An opening / closing shaft that transmits the closing / closing operation to the part, a cam fixed to the cam shaft, a drive lever that is fixed to the opening / closing shaft and protrudes toward the cam, and a cam that transmits the rotational movement of the cam to the drive lever・ A drive lever interlocking part, a closing spring that rotates the opening / closing shaft in the direction of the closing operation via the cam / drive lever interlocking part by transmitting a throwing input to the cam, and an opening / closing part by transmitting a blocking force to the opening / closing shaft And a cam / drive lever interlocking portion, a relay lever that swings around the swing shaft, a relay roller that contacts a part of the cam and the drive lever, and a shut-off spring that rotates the shaft in the direction of the shut-off operation. The cam rotation operation It was to be transmitted as rotation of the driving lever by swinging of the relay lever via a joint roller.

  According to the operation mechanism of the vacuum circuit breaker according to the present invention, it is not necessary to assemble a cam, a drive lever, etc. and a rod, and a simple cam / opening / closing lever interlocking unit structure is used, thereby reducing the apparatus cost. be able to.

It is the front view which showed the vacuum circuit breaker of 1st Embodiment which concerns on this invention in the state which removed the front cover. It is a perspective view which shows interruption | blocking operation | movement of the operation mechanism of the vacuum circuit breaker of 1st Embodiment. It is a perspective view which shows the injection | throwing-in operation | movement of the operation mechanism of the vacuum circuit breaker of 1st Embodiment. It is a figure which shows the rotation direction at the time of interruption | blocking of the opening / closing axis | shaft which comprises the operation mechanism of 1st Embodiment, and injection | throwing-in. It is a figure which shows the auxiliary switch apparatus interlock | cooperated with the relay lever of the operation mechanism of 1st Embodiment. It is a figure which shows the state in which the relay lever of the operation mechanism of 1st Embodiment is positioned in the insertion position by the positioning member.

Next, a first embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
The first embodiment described below exemplifies an apparatus and method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, and structure of component parts. The arrangement is not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[Configuration of vacuum circuit breaker]
A vacuum circuit breaker according to a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, support frames 11 a to 11 c are arranged in the apparatus case 1. 2 and 3, the support frame 11c is omitted from the support frames 11a to 11c in order to show the structure of the component parts in detail.
FIG. 1 shows a state in which a front cover (not shown) of the vacuum circuit breaker according to the first embodiment of the present invention is removed, and an operation mechanism 2 is arranged inside an apparatus case 1.

As shown in FIGS. 2 and 3, a plurality of vacuum valves VA, VB, VC are arranged in the horizontal direction on the back side of the operation mechanism 2, and each vacuum valve has a fixed electrode Vd and a movable electrode. An electrode Ve is provided. FIG. 2 shows a shut-off state of the vacuum valves VA, VB, VC (a state where the fixed contact Sa and the movable contact Sb are open), and FIG. 3 shows a state where the vacuum valves VA, VB, VC are turned on (fixed) The contact Sa and the movable contact Sb are closed). Reference numeral 11d denotes a part of the instruction frame arranged in the device case 1.
As shown in FIGS. 1 and 2, the operation mechanism 2 includes a valve driving unit 3, an opening / closing lever 4, an opening / closing shaft 5, an input unit 6, a driving lever 7, a relay lever 8, and a cutoff spring 9. , And an auxiliary switch device 10 that is interlocked with the input unit 6 is disposed in the device case 1.

The auxiliary switch device 10 is connected to an external device to perform an ON / OFF switching operation. When the vacuum valves VA, VB, VC are in a cut-off state, the auxiliary switch device 10 is turned off, and the vacuum valves VA, VB, VC are turned on. It is a device that performs an ON operation when in a state.
As shown in FIG. 2, the valve driving unit 3 is connected to the movable contact side of each of the vacuum valves VA, VB, and VC, and performs a closing operation and a shutting-off operation of the vacuum valves VA, VB, and VC. And an insulating rod 15 connected to the movable contact Sb of each vacuum valve, a contact pressure spring 16, and a movable contact drive unit 17 for moving the movable contact Sb to the open / close position.
The opening / closing shaft 5 extends in the direction in which the vacuum valves VA, VB, VC are arranged side by side, and a plurality of opening / closing levers 4 are fixed to the outer periphery of the opening / closing shaft 5 at predetermined intervals in the axial direction. Has been. These opening / closing levers 4 are engaged with the movable contact drive unit 17 of the valve drive unit 3.

Here, the clockwise rotation of the opening / closing shaft 5 shown in FIG. 4 is a rotation in a blocking direction in which the fixed contact Sa and the movable contact Sb of the vacuum valves VA, VB, VC are opened, and in FIG. The counterclockwise rotation of the opening / closing shaft 5 shown is a rotation in the closing direction in which the fixed contact Sa and the movable contact Sb of the vacuum valves VA, VB, VC are closed.
The charging unit 6 includes a motor 20 (see FIG. 1), a rotating shaft (not shown) through which the rotational driving force of the motor 20 is transmitted via a plurality of gears 21a (see FIG. 1), and as shown in FIG. A cam 22 fixed to the rotating shaft, and a closing spring 24 having one end connected to the rotating shaft via a crank lever 23 and the other end connected to the device case 1.

Further, a cam follower 25 protrudes from the side surface of the cam 22, and a closing latch 26 rotatably disposed on the support frame 11 b is engaged with the cam follower 25. A blocking latch 27 is rotatably arranged on the support frame 11b near the closing latch 26.
As shown in FIG. 2, the drive lever 7 is fixed to the open / close shaft 5 and extends to a position below the cam 22 between the support frames 11b and 11c.
The relay lever 8 is swingably disposed between the cam 22 and the drive lever 7 with the swing shaft 8a connected to the support frames 11b and 11c.

On the side surface of the relay lever 8, a first roller 8 b that engages with the cam surface of the cam 22, a second roller 8 c that engages with the top surface on the front end side of the drive lever 7, and a third roller that engages with the blocking latch 27. A roller 8d is connected.
The charging unit 6 rotates the crank lever 23 by the motor 20 transmitting a rotational driving force to the rotating shaft via the plurality of gears 21a. Then, as the crank lever 23 rotates, the closing spring 24 accumulates the spring force (throwing input) in the compressed state.
When the vacuum valves VA, VB, and VC are turned on, the cam 22 is rotated via the rotating shaft by the throwing force accumulated in the closing spring 24.

As shown in FIG. 1, one end of the cutoff spring 9 is fixed to the open / close shaft 5 via the open / close lever 4, and the other end is fixed to the inner wall of the device case 1. When the vacuum valves VA, VB, and VC are turned on, the cutoff spring 9 accumulates a spring force (a cutoff force) in a tension state while the spring length is increased. When the vacuum valves VA, VB, VC are shut off, the opening / closing shaft 5 is rotated in the shut-off direction by the spring shut-off force accumulated in the shut-off spring 9.
As shown in FIG. 5, the auxiliary switch device 10 disposed in the device case 1 includes a switch main body 30, a switch drive shaft 31 protruding from the switch main body 30, and a connecting member fixed to the switch drive shaft 31. And a switch interlocking plate 33 having an upper end rotatably connected to 32 and a lower end rotatably connected to the rotation shaft of the first roller 8b of the relay lever 8.

Here, as shown in FIG. 6, a spring engagement member 35 protruding from the support frame 11c is provided near the swing shaft 8a of the relay lever 8, and the relay lever 8 near the swing shaft 8a is provided on the relay lever 8. A spring engaging hole 36 is formed.
A torsion spring 37 is wound around the swing shaft 8 a, and one end 37 a of the torsion spring 37 is engaged with the spring engaging member 35, and the other end 37 b of the torsion spring 37 is inserted into the spring engaging hole 36.
The torsion spring 37 rotates the relay lever 8 around the swinging shaft 8a so that the second roller 8c of the relay lever 8 always contacts the top surface of the drive lever 7 (clockwise rotation in FIG. 6). The spring force Fn is applied.
The cam side roller described in the present invention corresponds to the first roller 8b, and the drive lever side roller described in the present invention corresponds to the second roller 8c and is described in the present invention. The positioning member is corresponding to the return spring 37.

[Operation of vacuum breaker operation mechanism]
Next, the operation of the operation mechanism 2 and the operation of the auxiliary switch device 10 when the vacuum valves VA, VB, VC are switched from the shut-off state to the closing state will be described.
2, the cam 22 is rotated counterclockwise by the throwing force accumulated in the closing spring 24 by releasing the engagement state of the closing latch 26 with respect to the cam follower 25 of the cam 22. As a result, as shown in FIG. 3, the cam surface of the cam 22 pushes down the first roller 8b of the relay lever 8, so that the relay lever 8 swings counterclockwise around the swing shaft 8a. As the relay lever 8 swings counterclockwise, the drive lever 7 whose top surface is in contact with the second roller 8c of the relay lever 8 is pushed down, and as shown in FIG. Rotate to. Here, when the opening / closing shaft 5 rotates in the closing direction, the blocking spring 9 accumulates the blocking force in a tensioned state.

As described above, when the opening / closing shaft 5 rotates in the closing direction, each of the movable contacts Sb of the vacuum valves VA, VB, VC moves to a position where the movable contact Sb comes into contact with the fixed contact Sa by driving of the valve drive unit 3. The vacuum valves VA, VB and VC are turned on.
And as shown in FIG. 3, the relay lever 8 which pushed down the drive lever 7 with the 2nd roller 8c hold | maintains an insertion position because the 3rd roller 8d engages with the interruption | blocking latch 27. FIG.
On the other hand, the swinging operation of the relay lever 8 in the closed state is transmitted to the switch body 30 as the vertical movement of the switch interlocking plate 33 and the connecting member 32 of the auxiliary switch device 10 and the rotational movement of the switch drive shaft 31. Then, the auxiliary switch device 10 performs an ON operation corresponding to the state in which the vacuum valves VA, VB, VC are turned on.

The operation of the operation mechanism 2 and the operation of the auxiliary switch device 10 when the vacuum valves VA, VB, VC are switched from the on state to the shut off state will be described.
3, when the engagement state of the blocking latch 27 with respect to the third roller 8d of the relay lever 8 is released, the opening / closing shaft 5 rotates in the blocking direction by the blocking force accumulated in the blocking spring 9.
When the opening / closing shaft 5 rotates in the shut-off direction by the shut-off force of the shut-off spring 9, the movable contacts Sb of the vacuum valves VA, VB, VC are driven by the valve drive unit 3 as shown in FIG. The vacuum valves VA, VB, and VC are shut off after moving to a position away from Sa.

Further, since the drive lever 7 is rotated simultaneously with the rotation of the opening / closing shaft 5 in the blocking direction, the relay lever 8 in which the second roller 8c is in contact with the drive lever 7 is rotated around the swing shaft 8a in FIG. Swings in the direction to the blocking position.
Then, the swinging operation of the relay lever 8 in the cut-off state includes the upward movement of the switch interlocking plate 33 and the connecting member 32 of the auxiliary switch device 10, the second rotational motion of the switch drive shaft 31 (the first rotational motion described above). Is transmitted to the switch body 30 via the reverse direction). Then, the auxiliary switch device 10 performs an OFF operation corresponding to the cutoff state of the vacuum valves VA, VB, and VC.

By the way, when the shut-off spring 9 of the operation mechanism 2 is shut off for some reason in the shut-off state of the vacuum valves VA, VB, VC, the fixed contact Sa and the movable contact Sb of the vacuum valves VA, VB, VC are closed. However, the auxiliary switch device 10 may be turned off.
That is, if the shut-off force of the shut-off spring 9 is not transmitted to the open / close shaft 5, a self-closing force that moves in the direction in which the movable contact Sb moves to the fixed contact Sa acts on the vacuum valves VA, VB, VC in the vacuum state. Thus, the fixed contact Sa and the movable contact Sb are closed.

Here, if the relay lever 8 is located at the cutoff position, the auxiliary switch device 10 performs an OFF operation in which the vacuum valves VA, VB, and VC are in the cutoff state.
Therefore, in the first embodiment, the torsion spring 37 wound around the swinging shaft 8a of the relay lever 8 applies the spring force Fn to the relay lever 8 and rotates the relay lever 8 to the closing position.
Thus, since the relay lever 8 is located at the closing position, the auxiliary switch device 10 performs an ON operation in which the vacuum valves VA, VB, and VC are in the closing state.
Therefore, when the shutoff spring 9 of the operating mechanism 2 is shut off and the fixed contact Sa and the movable contact Sb of the vacuum valves VA, VB, VC are closed in the shutoff state of the vacuum valves VA, VB, and VC (the open state and The auxiliary switch device 10 is turned on.

Next, the effect of the operation mechanism of the vacuum circuit breaker of the first embodiment will be described.
When the vacuum valves VA, VB, and VC are turned on, the cam surface of the cam 22 pushes down the first roller 8b of the relay lever 8, and the drive lever in which the upper surface on the tip side is in contact with the second roller 8c of the relay lever 8 7 is pushed down, and the opening and closing shaft 5 rotates in the closing direction.
When the vacuum valves VA, VB, and VC are in the shut-off state, the drive lever 7 that rotates simultaneously with the rotation of the open / close shaft 5 in the shut-off direction causes the relay lever 8 to rotate around the swinging shaft 8a via the second roller 8c. Oscillate clockwise to the blocking position.

As described above, in the first embodiment, the interlocking structure between the relay lever 8 and the drive lever 7 is provided, and the first roller 8b and the second roller 8c are provided on the relay lever, and the first roller 8b and the second roller 8c are provided. The cam surface of the cam 22 and a part of the upper surface of the drive lever 7 are in contact with each other. Such an interlocking structure that interlocks between the cam 22 and the drive lever 7 via the relay lever 8 of the first embodiment requires less assembly man-hours than a conventional structure in which the cam and the drive lever are connected by a rod. Since the time can be greatly shortened, the apparatus cost can be reduced.
Further, when the shut-off spring 9 of the operation mechanism 2 is shut off for some reason in the shut-off state of the vacuum valves VA, VB, and VC, the self-closing force of the vacuum valves VA, VB, and VC in the vacuum state works to enter the put-in state. . Here, if the relay lever 8 of the operation mechanism 2 is located at the shut-off position, the auxiliary switch device 10 interlocked with the relay lever 8 performs the OFF operation, and the vacuum valve VA, VB, VC is turned on. There is a possibility that the auxiliary switch device 10 transmits a different signal to the external device.

However, since the torsion spring 37 wound around the swing shaft 8a acts on the relay lever 8 to apply the spring force Fn to the relay lever 8 and rotate the relay lever 8 to the closing position, the vacuum valve VA in a vacuum state. , VB, and VC are in the on state due to the operation of the self-closing force, the auxiliary switch device 10 is turned on.
Therefore, even if the vacuum valves VA, VB, VC are turned on when the cutoff spring 9 is shut off, the auxiliary switch device 10 is interlocked with the normal ON operation, and the auxiliary switch device 10 is connected to the vacuum valves VA, VB, There is no possibility that a signal different from the VC input state is transmitted to the external device.

DESCRIPTION OF SYMBOLS 1 Device case 2 Operation mechanism 3 Valve drive part 4 Opening / closing lever 5 Opening / closing shaft 6 Insertion part 7 Driving lever 8 Relay lever 8a Oscillating shaft 8b First roller 8c Second roller 8d Third roller 9 Shut-off spring 10 Auxiliary switch device 11a 11c Support frame 15 Insulating rod 16 Contact pressure spring 17 Movable contactor drive unit 20 Motor 21a, 21b Gear 22 Cam 23 Crank lever 24 Release spring 25 Cam follower 26 Input latch 27 Shut off latch 30 Switch body 31 Switch drive shaft 32 Connecting member 33 Switch Interlocking plate 35 Spring engagement member 36 Spring engagement hole 37 Torsion spring Fn Torsion spring spring force Sa Fixed contact Sb Movable contact VA, VB, VC Vacuum valve Vd Fixed electrode Ve Movable electrode

Claims (4)

A valve drive unit that is connected to a movable contact of the vacuum valve to perform a closing operation of the vacuum valve; and
An opening / closing shaft for transmitting a closing / closing operation to the valve driving unit;
A cam fixed to the camshaft;
A drive lever fixed to the open / close shaft and protruding toward the cam;
A cam / drive lever interlocking part for transmitting the rotational movement of the cam to the drive lever;
A closing spring that rotates the opening and closing shaft in the closing operation direction via the cam / drive lever interlocking unit by transmitting a throwing input to the cam;
A cutoff spring that rotates the opening and closing shaft in the direction of the blocking operation by transmitting a blocking force to the opening and closing shaft;
The cam / drive lever interlocking part is
A relay lever that swings around a swing shaft, and a relay roller that contacts a part of the cam and the drive lever,
The operation mechanism of the vacuum circuit breaker, wherein the rotation operation of the cam is transmitted as the rotation operation of the drive lever by the swing of the relay lever through the relay roller.   2. The vacuum circuit breaker according to claim 1, wherein the relay roller includes a cam-side roller that contacts a cam surface of the cam and a drive lever-side roller that contacts a part of the drive lever. Operating mechanism. A switch interlocking plate is connected to the relay lever, and the ON / OFF state corresponding to the ON / OFF operation of the vacuum valve is transmitted by transmitting to the switch interlocking plate the closing position or the cutoff position where the relay lever is swung. Auxiliary switch device for switching operation is provided,
3. The vacuum according to claim 1, wherein the relay lever is positioned at the closing position by a positioning member when no external force is applied from the cam or the drive lever. Circuit breaker operating mechanism.   4. The vacuum interrupter according to claim 3, wherein the positioning member is a spring member that is arranged around the swinging shaft of the relay lever and acts on a spring force that swings the relay lever to the closing position. The operation mechanism of the vessel.

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