JP2021089883A - Operation mechanism of vacuum circuit breaker - Google Patents

Abstract

To provide an operation mechanism of a vacuum circuit breaker that can easily perform maintenance work such as periodical wear check and lubrication of an input/shutoff interlocking portion even when the device is miniaturized, densified, and modularized.SOLUTION: An operation portion 12 that operates an input/shutoff interlocking portion 6 includes an input button 31 that performs input operation to a unit base 30 and the input/shutoff interlocking portion, a shutoff button 32 that shuts off the input/shutoff interlocking portion, an input side solenoid 33 that performs input operation of the input button by an electric command, and a button operation unit 13 incorporated in a shutoff side solenoid 34 that performs shut-off operation of the shutoff button by an electric command. The unit base of the button operation unit is detachably attached to the front side of a device case 2, and when the unit base of the button operation unit is removed from the front side of the device case, a component of the input/shutoff interlocking portion arranged inside the device case appears on the front side.SELECTED DRAWING: Figure 3

Description

The present invention relates to an operating mechanism of 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 closed pole position and the open pole position by the closing / shutting command (for example, Patent Document 1).
The operation mechanism of the vacuum breaker is a valve drive unit that is connected to the movable contact of the vacuum valve to perform the closing / shutting operation of the vacuum valve, and the valve drive unit is connected via an open / close lever, and the valve drive unit is rotated by rotation. The opening / closing shaft that transmits the closing / closing operation, the cam that is fixed to the cam shaft, the drive lever that is fixed to the opening / closing shaft and protrudes toward the cam, and the closing that transmits the rotation of the cam to the drive lever. -It is equipped with a shut-off interlocking unit, a closing spring that transmits a rotational force in the closing direction to the cam via the cam shaft, and a button operation unit that operates the closing / shut-off interlocking unit by operating a button.

Japanese Patent No. 3454040

Since malfunction of a vacuum circuit breaker directly leads to a serious loss, if it is used continuously for 10 years or more, it is necessary to perform regular inspections such as wear check of the operation mechanism and maintenance such as lubrication.
By the way, in recent years, the operation mechanism of the vacuum circuit breaker is required to be miniaturized, increased in density, and modularized in order to flexibly meet the market demand. , The above-mentioned maintenance is difficult. In particular, the button operation part of the operation mechanism is located on the front side of the device case, and the charging / shutoff interlocking part that requires lubrication is located inside the device case, making maintenance work such as lubrication difficult. Is.

Therefore, according to the present invention, even if the device is miniaturized, has a high density, and is modularized, it is possible to easily perform maintenance work such as wear confirmation and lubrication of the input / shutoff interlocking portion. It is intended to provide an operating mechanism for a vacuum circuit breaker.

In order to achieve the above object, the operation mechanism of the vacuum breaker according to one aspect of the present invention includes a valve drive unit that performs a closing / shutting operation of the vacuum valve and an opening / closing that transmits the closing / shutting operation to the valve drive unit. The shaft, the closing cam fixed to the cam shaft, the drive lever fixed to the open / close shaft, the closing / shutoff interlocking part that transmits the rotational movement of the closing cam to the drive lever, and the closing interlocking part via the cam shaft. It is equipped with a closing spring that transmits the rotational force in the closing direction to the cam and an operation unit that operates the closing / shutting interlocking unit. The button, the shut-off button that shuts off the closing / shut-off interlocking part, the closing-side solenoid that turns on the closing button by an electric command, and the shut-off side solenoid that shuts off the shut-off button by an electric command are integrated. It is equipped with a button operation unit, and this button operation unit is detachably attached to the device case, and when the button operation unit is removed from the device case, it is placed inside the device case. The interlocking part is made to appear.

According to the operation mechanism of the vacuum circuit breaker according to the present invention, even if the device is miniaturized, has a high density, and is modularized, inspections such as periodic wear confirmation and lubrication of the charging / blocking interlocking portion can be performed. Maintenance work can be easily performed.

It is a front view which showed the vacuum circuit breaker of 1st Embodiment which concerns on this invention with the front cover removed. It is the figure which showed the operation mechanism of a vacuum circuit breaker from the front side. It is a figure which shows the state which removed the button operation unit arranged on the front side of the device case of the operation mechanism of a vacuum circuit breaker. (A) shows a closing button, a closing operation transmission mechanism, and an interlock mechanism of the button operation unit, and (b) shows a state in which the closing button is pressed. (A) shows the shutoff button and the shutoff half-moon latch operation mechanism of the button operation unit, and (b) shows the state where the shutoff button is pressed. (A) is a side view showing the operation unit, and (b) is a plan view showing the operation unit. (A) shows the closing button and the closing operation transmission mechanism of the button operation unit when the interlock mechanism is operating, and (b) shows the state in which the closing operation transmission mechanism does not operate even if the closing button is pressed. There is. It is a figure which shows the part to be lubricated which appeared on the front side of a device case by removing a button operation unit.

Next, a first embodiment of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated 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 plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.
In addition, the first embodiment shown below exemplifies an apparatus or method for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, and structure of the constituent parts. , Arrangement, etc. are not specified as the following. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

[Configuration of vacuum circuit breaker]
The vacuum circuit breaker of the first embodiment according to the present invention will be described with reference to FIGS. 1 to 8.
FIG. 1 shows the vacuum circuit breaker 1 of the first embodiment, and the operation mechanism 3 is arranged inside the device case 2 from which the front cover (not shown) is removed. Support frames 11a and 11b are arranged in parallel in the device case 2.
A plurality of vacuum valves VA, VB, and VC are arranged side by side in the horizontal direction on the back side of the operation mechanism 3, and each vacuum valve has a fixed contact (not shown) and a movable contact (not shown). I have.

As shown in FIGS. 1 and 2, the operation mechanism 3 includes a valve drive unit 4, an opening / closing lever 5 engaged with a movable contact drive unit (not shown) of the valve drive unit 4, and closing / shutting interlocking. A unit 6, a drive lever 7, a shutoff spring 9, an auxiliary switch device 10 interlocked with the closing / shutoff interlocking portion 6, and an operation portion 12 are provided.
As shown in FIG. 1, the valve drive unit 4 is provided so as to be connected to the movable contact side of each of the vacuum valves VA, VB, and VC, and performs a closing operation and a shutoff operation of the vacuum valves VA, VB, and VC. It is equipped with an insulating rod (not shown) connected to the movable contacts of each vacuum valve, a pressure contact spring (not shown), and a movable contact drive unit (not shown) that moves the movable contacts to the open / close position. ..
An opening / closing lever 5 is fixed to the outer circumference of an opening / closing shaft (not shown) extending in the direction in which the vacuum valves VA, VB, and VC are arranged, and the opening / closing lever 5 is a movable contact drive unit of the valve drive unit 4. Is engaged in.

At a lower position between the support frames 11a and 11b, a drive lever 7 fixed to the outer circumference of the opening / closing shaft extends to the front side.
As shown in FIG. 3, the closing / shutoff interlocking unit 6 is fixed to the motor 20, the rotating shaft 19 in which the rotational driving force of the motor 20 is transmitted via the plurality of gears 21a, and the rotating shaft 19. It includes a throw-in cam 22 and a throw-in spring 24 whose one end is connected to the rotating shaft 19 via a crank lever 23 and the other end is connected to the device case 1.
The on / off interlocking unit 6 rotates the crank lever 23 by the motor 20 transmitting a rotational driving force to the rotating shaft 19 via a 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. Then, during the closing operation of the vacuum valves VA, VB, and VC, the closing cam 22 rotates via the rotating shaft 19 by the throwing input accumulated in the closing spring 24.

As shown in FIG. 4A, a closing cam follower 25 projects from the side surface of the closing cam 22, and a closing latch 26 rotatably arranged on the support frame 11a is engaged with the closing cam follower 25. .. Further, as shown in FIGS. 2 and 3, a cutoff latch 27 is rotatably arranged on the support frame 11b near the closing latch 26.
As shown in FIG. 5A, the relay lever 8 is swingably arranged between the closing cam 22 and the drive lever 7 with the swing shaft 8a connected to the support frames 11a and 11b. A shutoff latch 27 is engaged with the relay lever 8, and a first roller 8b that engages with the cam surface of the closing cam 22 is connected to the side surface of the relay lever 8.

As shown in FIG. 1, one end of the blocking spring 9 is fixed to the opening / closing shaft via the opening / closing lever 5, and the other end is fixed to the inner wall of the device case 1. During the closing operation of the vacuum valves VA, VB, and VC, the breaking spring 9 accumulates a spring force (breaking force) in a tension state while increasing the spring length. Then, when the vacuum valves VA, VB, and VC are shut off, the opening / closing shaft is rotated in the shutoff direction by the spring breaking force accumulated in the breaking spring 9.
As shown in FIG. 2, the auxiliary switch device 10 is a device that is connected to an external device to perform an ON / OFF switching operation. When the vacuum valves VA, VB, and VC are in a cutoff state, the auxiliary switch device 10 performs an OFF operation and is a vacuum valve. It is a device that performs ON operation when VA, VB, and VC are in the turned-on state.

As shown in FIGS. 4A, 5A, 6A, and 6B, the operation unit 12 includes a button operation unit 13, a half-moon latch operation mechanism 14, and an interlock mechanism 16. , Is equipped.
As shown in FIGS. 6A and 6B, the button operation unit 13 is a unit base 30 formed by bending a metal plate material, and a charging button 31, a blocking button 32, a closing side solenoid 33, and a blocking side solenoid 34 are integrated. It is located in.
The unit base 30 is arranged so that the right side of FIG. 6A is located on the back side of the device case 2 and the left side is located on the front side of the device case 2. A groove 30a is formed in the unit base 30 located on the back surface side of the device case 2, and a pin (reference numeral 11c in FIG. 3) formed on the inner walls of the support frames 11a and 11b is fitted. Further, the unit base 30 located on the front side of the device case 2 is fixed to the support frames 11a and 11b by screwing.

The closing button 31 and the blocking button 32 are arranged on the front side of the unit base 30 so as to be located on the front side of the device case 2.
As shown in FIG. 6A, the closing side solenoid 33 includes a solenoid main body 33a, a closing lever 33b that is sucked and retracted in the on state of the solenoid main body 33a, and is released from suction and extended in the off state. It includes a connecting plate 33c connected between the side lever 33b and the closing button 31, and a return spring 33d arranged on the outer periphery of the connecting plate 33c. As shown in FIG. 6B, the shut-off side solenoid 34 includes a solenoid main body 34a and a shut-off side lever 34b that is sucked and retracted in the on state of the solenoid main body 34a and is released from suction and extended in the off state. I have.

As shown in FIGS. 6A and 4A, the closing half-moon latch operating mechanism 14 rotates to the lower part of the closing button 31 and the interlock lever 35a rotatably connected to the unit base 30. The freely connected intermediate lever 35b, the interlock link 35c connecting between the interlock lever 35a and the intermediate lever 35b, the half-moon latch lever drive pin 35d protruding from the side surface of the intermediate lever 35b, and the half-moon The closing half-moon latch lever 35f, which is arranged so as to be engaged with the latch lever drive pin 35d and rotates in the same direction as the closing half-moon latch 35e, and the return spring 35g for urging the closing half-moon latch lever 35f in the returning direction I have. The closing operation transmission mechanism described in the present invention corresponds to the closing half-moon latch operating mechanism 14.

Here, as shown in FIG. 4A, the interlock lever 35a is arranged so as to be engageable with the auxiliary switch interlocking member 10b fixed to the switch drive shaft 10a of the auxiliary switch device 10.
Further, the above-mentioned interlock mechanism 16 is composed of an interlock lever 35a and an interlock link 35c.
As shown in FIG. 5A, a blocking half-moon latch lever 36a is engaged with the lower part of the blocking button 32, and a blocking half-moon latch 36b that rotates in the same direction as the blocking half-moon latch lever 36a and a blocking half-moon latch 36b and a blocking half-moon latch. It includes the above-mentioned cutoff latch 27 which is engaged with 36b and is urged clockwise by a coil spring 36c.

[About the operation of the operation mechanism of the vacuum circuit breaker]
Next, the operation of the operation mechanism 3 when the vacuum valves VA, VB, and VC are changed from the cutoff state to the closing state will be described.
As shown in FIG. 4B, the closing button 31 is pushed, the closing half-moon latch lever 35f is pushed by the half-moon latch lever drive pin 35d provided on the intermediate lever 35b, and the closing half-moon latch 35e is rotated counterclockwise. The engagement state of the closing latch 26 with the closing cam follower 25 of the closing cam 22 is released, and the closing cam 22 is rotated counterclockwise by the throwing input stored in the closing spring 24. As a result, the cam surface of the closing cam 22 pushes down the first roller 8b of the relay lever 8 shown in FIG. 5A, so that the relay lever 8 swings counterclockwise around the swing shaft 8a. The counterclockwise swing of the relay lever 8 pushes down the drive lever 7 in contact with the relay lever 8, and the opening / closing shaft rotates in the closing direction. Here, when the opening / closing shaft rotates in the closing direction, the blocking spring 9 accumulates breaking force in a tension state.

By rotating the opening / closing shaft in the closing direction in this way, the movable contacts of the vacuum valves VA, VB, and VC move to the positions where they come into contact with the fixed contacts by the drive of the valve drive unit 4, and the vacuum valve VA, VB, and VC are turned on. Then, the relay lever 8 is engaged with the shutoff latch 27 to hold the closing position (see FIG. 5A).
Further, the swinging motion of the relay lever 8 in the turned-on state is transmitted to the auxiliary switch device 10 as a rotational motion of the switch drive shaft 10a via a switch interlocking plate (not shown). Therefore, the auxiliary switch device 10 performs an ON operation corresponding to the closed state of the vacuum valves VA, VB, and VC.

Next, the operation of the operation mechanism 3 when the vacuum valves VA, VB, and VC are changed from the turned-on state to the shut-off state will be described.
As shown in FIG. 5B, when the shutoff button 32 is pressed, the shutoff half-moon latch lever 36a engaged with the lower part of the shutoff button 32 rotates clockwise and rotates together with the shutoff half-moon latch lever 36a. The shutoff latch 27 is disengaged from the shutoff half-moon latch 36b and rotates clockwise. Since the shutoff latch 27 rotated clockwise is released from the engagement state with the relay lever 8, the opening / closing shaft rotates in the shutoff direction by the breaking force accumulated in the breaking spring 9.

When the opening / closing shaft rotates in the breaking direction due to the breaking force of the breaking spring 9, the movable contacts of the vacuum valves VA, VB, and VC move to positions separated from the fixed contacts by the drive of the valve driving unit 4, and the vacuum is created. The valves VA, VB, and VC are shut off.
Then, the swinging motion of the relay lever 8 in the cutoff state is transmitted to the auxiliary switch device 10 as a rotary motion of the switch drive shaft 10a via a switch interlocking plate (not shown). Therefore, the auxiliary switch device 10 performs an OFF operation corresponding to the turned-on state of the vacuum valves VA, VB, and VC.
Next, the operation of the interlock mechanism 16 of the operation mechanism 3 of the present embodiment will be described. The interlock mechanism 16 does not turn on the vacuum valves VA, VB, and VC even when the closing button 31 is pressed, and maintains the shutoff state.

In the interlock mechanism 16 of the present embodiment, as shown in FIG. 7A, the switch drive shaft 10 of the auxiliary switch device 10 rotates clockwise, and the auxiliary switch interlocking member 10b moves the interlock lever 35a upward. Push up and hold. When the interlock lever 35a is pushed up, the intermediate lever 35b rotates counterclockwise via the interlock link 35c.
By rotating the intermediate lever 35b counterclockwise, as shown in FIG. 7B, even if the closing button 31 is pressed, the half-moon latch lever drive pin 35d provided on the intermediate lever 35b is changed to the closing half-moon latch lever 35f. Do not engage. As a result, the engagement state of the closing latch 26 with the closing cam follower 25 of the closing cam 22 is not released, and the relay lever 8 does not swing, so that the shutoff state is maintained and the interlock operation is performed.

[About removing the button operation unit]
Here, as shown in FIG. 3, the unit base 30 constituting the button operation unit 13 has the screws fixed to the support frames 11a and 11b removed on the front side of the device case 2 and the pins of the support frames 11a and 11b are removed. By releasing the fit between the 11c and the groove 30a of the unit base, the device case 2 is removed from the operating mechanism 3.
In the unit base 30, the closing button 31, the shutoff button 32, the closing side solenoid 33, and the shutoff side solenoid 34 are unitized and arranged integrally, and the intermediate lever 35b and the half moon constituting the closing half-moon latch operation mechanism 14 are arranged. The latch lever drive pin 35d, the interlock lever 35a and the interlock link 35c constituting the interlock mechanism 16 are also unitized and integrally arranged.
As shown in FIG. 8, the button operation unit 13 in which the above-mentioned operation parts are unitized has the motor pinion portion 37, the gear portion 38, and the cutoff half-moon latch lever 36a by removing the unit base 30 from the front side of the device case 2. , Auxiliary switch interlocking member 10b, closing half-moon latch 35e, shut-off half-moon latch 36b, and closing half-moon latch lever 35f appear on the front side.

[Effect of the operation mechanism of the vacuum circuit breaker]
Next, the operation and effect of the operation mechanism 3 of the vacuum circuit breaker 1 of the first embodiment will be described.
In the button operation unit 13 constituting the operation unit 12, the closing button 31, the shutoff button 32, the closing side solenoid 33, and the shutoff side solenoid 34 are unitized and integrally arranged on the unit base 30, so that the operation mechanism 3 is compact. It is possible to increase the density, increase the density, and modularize the module.
Further, the unit base 30 of the button operation unit 13 is easily attached and detachable to the front side of the device case 2. By removing the unit base 30 from the front side of the device case 2, FIG. 8 shows. Parts constituting the closing / shutting interlocking part 6 such as the motor pinion part 37, the gear part 38, the shutoff half moon latch lever 36a, the auxiliary switch interlocking member 10b, the closing half moon latch 35e, the shutoff half moon latch 36b, and the closing half moon latch lever 35f. Appears on the front side of the device case 2. Since these parts require regular lubrication, lubrication maintenance work can be easily performed in a short time. Further, by removing the unit base 30 and the operation parts appearing on the front side of the device case 2, the specifications of the operation mechanism 3 can be easily changed according to the voltage specifications.

Further, the unit base 30 of the button operation unit 13 includes an intermediate lever 35b and a half-moon latch lever drive pin 35d constituting the closing half-moon latch operating mechanism 14, an interlock lever 35a and an interlock link 35c constituting the interlock mechanism 16. However, since the operating mechanism 3 is unitized and arranged integrally, the operation mechanism 3 can be further miniaturized, densified, and modularized.

1 Vacuum breaker 2 Device case 3 Operation mechanism 4 Valve drive unit 5 Open / close lever 6 On / shutoff interlocking unit 7 Drive lever 8 Relay lever 8a Swing shaft 8b 1st roller 9 Breaking spring 10 Auxiliary switch device 10a Switch drive shaft 10b Auxiliary Switch interlocking member 11a, 11b Support frame 11c Pin 12 Operation unit 13 Button operation unit 14 Input half-moon latch operation mechanism (input operation transmission mechanism)
16 Interlock mechanism 19 Rotating shaft (cam shaft)
20 Motor 21a Gear 22 Input cam 23 Crank lever 24 Input spring 25 Input cam follower 26 Input latch 27 Shutoff latch 30 Unit base 30a Groove 31 Input button 32 Cutoff button 33 Input side solenoid 33a Solenoid body 33b Input side lever 33c Connecting plate 33d Return spring 34 Solenoid 34a Solenoid body 34b Blocking side lever 35 Input half-moon latch mechanism 35a Interlock lever 35b Intermediate lever 35c Interlock link 35d Half-moon latch lever drive pin 35e Input half-month latch 35f Input half-month latch lever 36a Blocking half-month latch lever 36b Latch 36c Coil spring VA, VB, VC Vacuum valve

Claims (3)

A valve drive unit that performs the closing / shutting operation of the vacuum valve, an opening / closing shaft that transmits the closing / shutting operation to the valve drive unit, a closing cam fixed to the cam shaft, and a drive fixed to the opening / closing shaft. The lever, the closing / shutoff interlocking unit that transmits the rotational operation of the closing cam to the drive lever, the closing spring that transmits the rotational force in the closing direction to the closing cam via the cam shaft, and the closing / shutting interlocking. Equipped with an operation unit to operate the unit
The operation unit has a unit base with a closing button for performing a closing operation for the closing / shutting interlocking unit, a shutoff button for performing a shutoff operation for the closing / shutting interlocking unit, and the closing button by an electric command. It is equipped with a button operation unit that integrally incorporates a closing solenoid that shuts off the shutoff button and a shutoff side solenoid that shuts off the shutoff button by an electric command, and the button control unit is detachably attached to the device case. Ori,
An operation mechanism of a vacuum circuit breaker, characterized in that when the button operation unit is removed from the device case, the closing / shutoff interlocking portion arranged inside the device case appears. The vacuum circuit breaker according to claim 1, wherein a part of a closing operation transmission mechanism for transmitting a closing operation from the closing button to the closing / shutting interlocking portion is integrally incorporated in the button operating unit. Operation mechanism. The operation mechanism of the vacuum circuit breaker according to claim 1, wherein the button operation unit integrally incorporates an interlock mechanism that does not transmit the closing operation to the closing / shutting interlocking unit even when the closing button is pressed. ..

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