JP3347587B2 - Circuit breaker switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker switching device.

[0002]

2. Description of the Related Art Conventional circuit breaker switching devices include:
For example, there is one as shown in FIGS. FIG. 3 shows a closed state, and FIG. 4 shows an open state. A closing operation and a trip (opening) operation, which are basic operations of the opening / closing operation device, will be described with reference to both drawings. 3, when a solenoid coil 41 as a driving source is excited, an armature rod 42 is driven upward, and a roller 44 provided on a pin 43 operates. As a result, the link 45 is
The link 47 connected to the link 47 and the link 48 connected to the link 47 by the pin 43 operate, and the link 48
Rotates counterclockwise about the fulcrum pin 49. Therefore, the operating rod 50 moves upward, and the shaft 51 rotates clockwise. As a result, the wipe spring 52 and the insulating operation rod 53 are driven rightward, the shaft 54 is rotated clockwise, the movable shaft 56 of the vacuum valve 55 is driven downward, and the movable contact 57 and the fixed contact 58 are closed. Then, the closing operation is performed. When the closing operation is completed, the force of the open-circuit spring 59 and the reaction force of the wipe spring 52 applied to rotate the shaft 51 counterclockwise are suppressed by the engagement between the trip catch 60 and the roller 61 provided on the pin 46. And the input state is maintained.

Next, when a trip command is input, the trip catch 60 is driven counterclockwise about the pin 63 by the trip coil 62, and the trip catch 60
Is disengaged from the roller 61, the operation of the above-mentioned links is lost, and the link 48 rotates clockwise about the fulcrum pin 49. Thereby, the operation rod 50,
The insulated operation rod 53 and the like are driven in a direction opposite to the above-described closing operation, and the closed state of the movable contact 57 and the fixed contact 58 is released, and an open state as shown in FIG. 4 is obtained.

[0004]

In the conventional circuit breaker switching operation device, there are relatively many places where the pins and links rotate and slide in the closing operation and the trip operation. In particular, the rotational sliding operation with a large load at the time of the closing operation slides in a state in which the contact pressure between the pin and the link is high, so that the friction and wear are greatly affected. With respect to the frequency opening and closing, it has been considered that inoperativeness due to the galling of the link connecting portion, occurrence of backlash, and the like should be improved.

[0005] The present invention has been made in view of the above,
It is an object of the present invention to provide a circuit breaker switching operation device that enables a frequent switching operation exceeding a certain level and realizes a highly reliable switching operation.

[0006]

According to a first aspect of the present invention, there is provided a circuit breaker switching device for operating a circuit breaker by driving a drive source. The lower drive block to be received and the upper drive block linked to the circuit breaker are respectively moved up by a linear guide.
The other end of the lower drive block is rotatably connected to a first link with a first pin, and the other end of the first link is connected to a second pin with a second pin. 2 link, and the other end of the second link is rotatably connected to the upper drive block with a third pin. In an initial state, the second pin is connected to the first drive block. A predetermined amount from the straight line connecting the third pin and the third pin to one side, and
Each other Taise' from the side to a first bearing provided on the pin of
The retractable holding blocks placed, wherein the time of the breaker closing operation by the driving of the driving source, the first bearing the lower drive blocks and an upper driving block causes guided by the linear guide required from the straight line The gist of the invention is that it is configured to be guided in contact with the holding block in an initial position state shifted to one side. With this configuration, at the time of the closing operation, the upper and lower drive blocks are linearly operated while being guided by the linear guide, and the first bearing provided at the connecting portion between the first link and the second link is also provided. While receiving some force on the holding block side, it is guided by the contact surface with the holding block and operates linearly.

According to a second aspect of the present invention, in the circuit breaker switching device according to the first aspect, the second link is formed in a substantially triangular shape having the third pin position as an apex. A fourth pin having a second bearing is provided at the other end of the triangular base with respect to the position of the second pin, a closing holding catch engageable with the second bearing is provided, and the holding block is moved sideways. A roller is provided on the holding block, and a trip catch engageable with the roller is provided. When the closing operation is completed, the second bearing is connected to the closing holding catch. Is engaged with the second
In this case, the link is held at the moving position, and the roller is engaged with the trip catch to receive the pressing force of the first bearing against the holding block. With this configuration, when the closing operation is completed, the second bearing provided on the second link is engaged with the closing holding catch, and the upper and lower drive blocks and the first and second links are associated with the closing operation. When the roller is held at the moving position and the roller provided on the holding block engages with the trip catch, the pressing force of the first bearing against the holding block is received and the closed state is maintained.

According to a third aspect of the present invention, in the circuit breaker opening / closing device according to the second aspect, a return spring for returning the holding block to an initial position is provided on the horizontal linear guide portion. At the time of the opening operation, the engagement state of the roller and the trip catch is released, the holding block is moved by a required amount on the lateral linear guide by the pressing force of the first bearing, and the second
In this case, the engagement state between the bearing and the closing holding catch is released, and when the opening operation is completed, the holding block is returned to the initial position by the return spring. With this configuration, in the opening operation, the holding block moves linearly on the horizontal linear guide by the required amount by the pressing force of the first bearing, and the first link and the second link are moved.
Are operated in a V-shape, and the upper and lower drive blocks operate linearly in the direction opposite to the closing operation. Thereafter, the holding block returns to the initial position by the return spring, and the opening operation is completed.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given based on FIG. First, the configuration of the circuit breaker switching operation device according to the present embodiment will be described with reference to FIG. In the figure, the upper drive block 1 and the lower drive block 2 are guided by the linear guide rods 3 and 4 at positions above and below two linear guide rods 3 and 4 provided in the vertical direction, respectively. It is arranged movably upward and downward. One end of the lower drive block 2 and the first link 5
The other end of the first link 5 is rotatably connected to one end of a substantially triangular second link 8 by a second pin 7. The upper end of the second link 8 is rotatably connected to the upper drive block 1 by a third pin 9. A fourth pin 15 having a second bearing 16 is provided at the other end of the triangular base of the second link 8.
Is provided. The second pin 7 is provided with a first bearing 10. The center position of the second pin 7 and the center of the first bearing 10 are initially set to the center of the first pin 6 and the third pin 10. A holding block 11 that is slightly offset from one side (the right side in the drawing) from the straight line connecting the center of the bearing 9 and that is in contact with the first bearing 10 at the time of the loading operation is provided beside the first bearing 10. ing. Holding block 1
1 is provided with a roller 12 and a holding block 11
Are guided by two horizontal linear guide rods 13 and 14 and can be moved in the horizontal direction. The horizontal linear guide bars 13 and 14 are provided with a return spring 17 for returning the holding block 11 to an initial state. 18
Is a closing catch that can rotate around the pin 19, 20 is a trip catch that can rotate around the pin 21, 35 is a trip coil that drives the trip catch 20 during trip operation, and 34 is an open spring. It is. The upper drive block 1 is sequentially connected to a control rod 23, a main shaft 24, a wipe spring 25 and an insulating control rod 26 which can be extended and contracted in a turnbuckle manner via a pin 22. Further, a Scott Russell mechanism 27 constitutes a circuit breaker. Connected to a movable shaft 29 of a vacuum valve 28. 30 is a movable contact attached to the movable shaft 29,
31 is a fixed contact. 32 is a solenoid coil which is a driving source, and 33 is a rod of the solenoid coil.

Next, the operation of the circuit breaker switching operation device configured as described above will be described. With reference to FIG. First, the solenoid coil 32 is excited by an electric injection command, and the rod 33 is driven to push the lower drive block 2 upward. This allows
The first link 5, the second link 8 and the upper drive block 1 connected to the lower drive block 2 are simultaneously driven upward. At this time, the upper and lower drive blocks 1 and 2
Are linearly operated by being guided by the two linear guide rods 3 and 4, and the first bearing 10 provided at the connecting portion between the first link 5 and the second link 8 is also connected to the holding block 1.
While receiving some force on one side, it is guided by the contact surface with the holding block 11 and operates linearly. The operation rod 23 is driven upward by the upward movement of the upper drive block 1, and the main shaft 24 rotates clockwise. As a result, the wipe spring 25 and the insulating operation rod 26 are driven rightward in the drawing, the driving direction is changed by the Scott Russell mechanism 27, and the movable shaft 29 of the vacuum valve 28 is moved downward to move the movable contact 30 and the fixed contact. 31 is closed and the closing operation is performed. When the closing operation is completed, the second link 8
A second bearing 16 provided on the fourth pin 15 of the second gear engages with the closing catch 18 and the second bearing
Pushes the holding block 11 laterally (rightward in the figure), and is completed by receiving the reaction force of the wipe spring 25 and the force of the open circuit spring 34. At this time, the force by which the first bearing 10 pushes the holding block 11 in the lateral direction is received by the engagement between the roller 12 provided on the holding block 11 and the trip catch 20, and the inserted state is maintained.

Next, a trip (opening) operation will be described with reference to FIG. By the electric trip command,
The trip coil 35 is excited and the trip catch 20
Is rotated clockwise about the pin 21. As a result, the trip catch 20 and the roller 12 are disengaged from each other, and the holding block 11 is pushed by the first bearing 10 and guided by the horizontal linear guide rods 13 and 14 in the horizontal direction (right direction in the drawing). Moving. Accordingly, the engagement between the input holding catch 18 and the second bearing 16 is also released, and the first link 5 and the second link 8 become inverted-shaped,
The upper and lower drive blocks 1 and 2 move downward.
As a result, the operating rod 23 connected to the upper drive block 1 is also driven downward, and the main shaft 24 rotates counterclockwise, contrary to the closing operation, and the insulated operating rod 2 is rotated.
6, the Scott Russell mechanism 27 is driven in order, the movable shaft 29 of the vacuum valve 28 is moved upward, the closed state of the movable contact 30 and the fixed contact 31 is released, and the circuit is opened.
When the open state is completed, the holding block 11 is operated by the action of the return spring 17 provided on the horizontal linear guide rods 13 and 14.
Returns to the initial position, and the upper and lower drive blocks 1 and
2 and the first link 5 and the second link 8 also return to the initial positions.

As described above, according to the present embodiment,
At the time of the closing operation that receives the most load force, the link mechanism operates in a linear motion, and does not perform the rotary sliding operation between the pin and the link hole, so even in the frequent opening and closing operation, friction,
Generation of galling and backlash due to wear is suppressed, and high reliability can be maintained. Also, in the trip operation with a small load, the first link 5 and the second link 8
Simply moves in the inverted letter shape, and the holding block 11 that holds and makes a linear motion, so that, as described above,
The abrasion resistance is improved, and high reliability with little variation in operating characteristics as a whole can be obtained.

[0013]

As described above, according to the first aspect of the present invention, the lower drive block receiving the driving force of the drive source and the upper drive block linked to the circuit breaker are respectively moved upward and downward by the linear guide. And the other end of the lower drive block is rotatably connected to a first link by a first pin, and the other end of the first link is connected to a second pin by a second pin.
And the other end of the second link is rotatably connected to the upper drive block with a third pin. In an initial state, the second pin is connected to the first drive block. pin and is positioned shifted to the requirements on one side from a straight line connecting the third pin, and placing the first bearing to be movable forward and backward each other Taise' from the side retention block provided on the second pin, the At the time of closing operation of the circuit breaker by driving of the drive source, the lower drive block and the upper drive block are guided by the linear guide, and the first bearing is shifted from the straight line by a required amount to one side in the initial position state. Because it is configured to be guided in contact with the holding block, the link mechanism section including the bearing operates linearly during the closing operation that receives the most load force, and the rotational sliding operation between the pin and the link hole is not possible. Since no I, also in the frequent opening and closing operation, friction can be maintained galling, high reliability occurrence of backlash is suppressed due to wear.

According to the second aspect of the present invention, the second link is formed in a substantially triangular shape having the third pin position as a vertex, and the second link at the triangular base portion is formed.
A fourth pin having a second bearing is provided at the other end with respect to the pin position, a closing retaining catch engageable with the second bearing is provided, and a lateral linear guide for laterally guiding the retaining block is provided. A roller is provided on the holding block, and a trip catch engageable with the roller is provided. When the closing operation is completed, the second bearing engages with the closing holding catch and the second Is held at the moving position, and the roller is engaged with the trip catch to receive the pressing force of the first bearing against the holding block, so that the link mechanism including the bearing is used for the closing operation. It is held at the associated moving position, and the inserted state can be held reliably.

According to the third aspect of the present invention, a return spring for returning the holding block to the initial position is provided in the lateral linear guide portion, and the roller and the trip catch are engaged when the circuit breaker is opened. Releasing the engagement state, moving the holding block on the horizontal linear guide by a required amount by the pressing force of the first bearing, and releasing the engagement state between the second bearing and the closing holding catch; When the opening operation is completed, the holding block is returned to the initial position by the return spring. Therefore, even in the opening operation with a small load, the first link and the second link can be formed in a square shape. The holding block, which is closed and held, operates linearly only by operating, improving wear resistance and minimizing variation in operating characteristics as a whole. There it is possible to maintain the reliability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a circuit breaker switching operation device according to the present invention.

FIG. 2 is a diagram for explaining the operation of the embodiment.

FIG. 3 is a diagram showing a closed state of a conventional circuit breaker switching operation device.

FIG. 4 is a diagram showing an open circuit state in the conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper drive block 2 Lower drive block 3, 4 Linear guide rod 5 1st link 6 1st pin 7 2nd pin 8 2nd link 9 3rd pin 10 1st bearing 11 Holding block 12 Roller 13 , 14 Lateral linear guide rod 15 Fourth pin 16 Second bearing 17 Return spring 18 Closing and holding catch 20 Trip catch 28 Vacuum valve constituting circuit breaker 32 Solenoid coil (drive source) 35 Trip coil

Continuation of the front page (72) Inventor Hiroshi Umino 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corporation (56) References JP-A-9-190743 (JP, A) JP-A-64-17343 (JP) , A) JP-A-8-129941 (JP, A) JP-A-8-222088 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 33/42 H01H 33/66

Claims (3)

(57) [Claims] 1. A circuit breaker switching device for operating a circuit breaker by driving a drive source, wherein a lower drive block receiving the driving force of the drive source and an upper drive block associated with the circuit breaker are each linearly guided. The other end of the lower drive block is rotatably connected to a first link by a first pin, and the other end of the first link is connected to a second pin by a second pin. And the other end of the second link is rotatably connected to the upper drive block with a third pin. In an initial state, the second pin is It is positioned shifted to the requirements on one side from a straight line connecting the third pin and the first pin, which can advance and retreat mutually Taise' from the side to the first bearing provided on the second pin <br/> At the time of closing operation of the circuit breaker by installing the holding block and driving the drive source The lower drive block and the upper drive block are guided by the linear guide, and the first bearing is guided in contact with the holding block in an initial position state shifted from the straight line by a required amount to one side. An open / close operating device for a circuit breaker, which is constituted. 2. The second link is formed in a substantially triangular shape with the third pin position as a vertex, and a second bearing is provided at the other end of the triangular base at the other end with respect to the second pin position. A fourth pin having a pin, a closing holding catch engageable with the second bearing, a horizontal linear guide for guiding the holding block in a horizontal direction, and a roller provided on the holding block. Installing a trip catch engageable with the roller,
When the closing operation is completed, the second bearing engages with the closing holding catch to hold the second link in the moving position, and the roller engages with the trip catch to move the second link with respect to the holding block. 2. The circuit breaker switching device according to claim 1, wherein the device is configured to receive the pressing force of the first bearing. 3. A return spring for returning the holding block to an initial position is provided on the lateral linear guide portion, and when the circuit breaker is opened, the engagement state of the roller and the trip catch is released to release the engagement between the roller and the trip catch. The holding block is moved by a required amount on the horizontal linear guide by the pressing force of the first bearing, and the engagement state between the second bearing and the closing holding catch is released. When the opening operation is completed, the return is performed. 3. The circuit breaker switching device according to claim 2, wherein the holding block is returned to an initial position by a spring.