WO2004017347A1

WO2004017347A1 - Power circuit-breaker

Info

Publication number: WO2004017347A1
Application number: PCT/JP2002/008218
Authority: WO
Inventors: Hiroaki Hashimoto; Shinji Seto; Hideo Kawamoto; Kenichi Okubo; Tetsu Ishiguro
Original assignee: Hitachi, Ltd.
Priority date: 2002-08-12
Filing date: 2002-08-12
Publication date: 2004-02-26
Also published as: JPWO2004017347A1; TW200409156A; TWI231944B; JP4059250B2

Abstract

A power circuit-breaker, comprising a cut-off control part mainly formed of a main shaft, a turn-on control part mainly formed of a camshaft, a turn-off spring part with a turn-off spring having one end part engaged with the main shaft, a ratchet wheel fitted to the camshaft, a turn-on spring part having a turn-on spring, and a contact part for turning on or turning off a power, wherein the springs of the turn-off spring part and the turn-on spring part accumulate or release a strain energy to switch between the turn-off and turn-on of the power, and notch parts are formed in the outer peripheral part of the ratchet wheel to avoid the impactive contact of a drive claw engaged with the ratchet wheel against ratchets of the ratchet wheel when the power is turned on.

Description

Description Power circuit breaker

Technical field

The present invention relates to a power circuit breaker, and more particularly to a power circuit breaker suitable for high-voltage specifications such as a substation and a switchyard.

Background art

Due to increasing power demand, there is a growing need for high-speed, compact, and lightweight power circuit breakers. In order to satisfy this need, driving devices using springs are often used in the operating devices of power circuit breakers in consideration of maintainability, noise, vibration and safety. An example of a conventional circuit breaker operating device using a panel is described in Japanese Patent Application Laid-Open No. 9-110672. In the operating device described in this publication, during the closing operation, the closing spring force is transmitted to the cut-off spring side via the cam and the main lever, and the contact is closed while compressing the cut-off spring. Then, the electric motor and the speed reduction mechanism compress the closing spring. In the speed reduction mechanism, the power of the electric motor is applied to the pawl shaft, and a single pawl mounted on the pawl shaft rotates a ratchet provided coaxially with the cam. In addition, a plurality of pawls are provided separately from the driving pawls to prevent the reverse rotation of the ratchet wheel.

Japanese Patent Laid-Open Publication No. 2001-210196 discloses that the operating device of the circuit breaker is shut off by the release of the shut-off spring and the release of the closing spring so that the operating device of the circuit breaker operates reliably. The closing operation is performed by the energy storage shaft that is driven to rotate. The blocking spring is charged by the release of the closing spring, and the closing spring is charged by the rotation of the charging shaft by the electric power storage mechanism. A large gear having a missing tooth portion is attached to the energy storage shaft, and a small gear matches the large gear.

In the above-mentioned Japanese Patent Application Laid-Open No. 9-106672, the cam separates from the main lever at the end of the closing operation, and the main lever and the lever of the cutoff control unit engage to maintain the breaking spring force. And prepares for the next shutoff operation. The cam and ratchet rotate by the inertial force and cross over the dead center, and stop when the closing spring is re-compressed and balances with the inertial force. After that, the cam and ratchet wheel rotate in the opposite direction due to the kinetic energy stored in the closing spring. Try to fall.

However, in this conventional example, the driving claw and the claw for preventing reverse rotation are engaged with the teeth of the ratchet so that the driving claw does not rotate in the reverse direction, but the kinetic energy of the ratchet is absorbed by the driving claw, so that an impact occurs. Further, a plurality of claws for preventing reverse rotation are formed. These claws are not always dispersed and can not always absorb energy, and depending on the distribution of load, the claws may be broken. For this reason, it was necessary to design the ratchet wheel in consideration of the impact force, and it was difficult to reduce the size of the entire actuator due to the large size of the parts. Further, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 2001-210196, the closing spring is wound up after the closing operation is completed, and when the winding is completed, the parts such as claws and latches are excessively large. Heavy load is prevented. However, the publication described in this publication does not sufficiently take into account that the impact load generated during the insertion operation has a great effect on the ratchet wheel, and as a result, the ratchet wheel becomes large.

The present invention has been made in view of the above-mentioned disadvantages of the related art, and an object of the present invention is to reduce an impact force that may occur when a power circuit breaker is turned on. Another object of the present invention is to reduce the size of the entire circuit breaker and improve the reliability. The present invention aims to achieve at least one of these. Disclosure of the invention

The feature of the present invention that achieves the above object is a power circuit breaker that switches on and off power by the spring force of a closing spring and a breaking spring! A closing spring link that expands and contracts the closing spring, a ratchet wheel fitted with this closing spring link, and a driving claw that matches this ratchet wheel are provided, and the ratchet wheel has a partially cut-out circle. It is in.

In this special floor, the outer periphery of the ratchet is preferably formed with a plurality of claws except for a notch and a portion adjacent to the notch. It is further desirable that the engagement between the hook and the driving claw is released so that the notch portion of the ratchet and the claw provided on the outer periphery of the hook after the driving claw has passed. Also, the notch May be a truncated circular shape, a polygonal shape, or a shape obtained by cutting a circle with a curve, and the notch is preferably formed at a center angle of about 60 degrees.

Another feature of the present invention for achieving the above object is that a contact having a fixed contact and a movable contact is opened and closed to switch between interruption and input of electric power, and the contact is released by releasing strain energy. In a power circuit breaker having a shut-off member and a closing member that opens and closes, a ratchet for storing strain energy in the charging member, and a driving claw for transmitting power to the ratchet, an outer peripheral surface of the pawl is connected to the driving claw. It has a claw portion having a plurality of claws to be combined with each other, and a notch portion having no claw formed thereon, and the driving claw comes into contact with the notch portion of the ratchet wheel during the closing operation.

According to this feature, a cam and a main lever for releasing the strain energy stored in the input member and storing the strain energy in the blocking member are provided, and the driving claw contacts the circumferential surface from the notch of the ratchet wheel. It is desirable that the abutment should be brought into contact with the claw portion after the swinging of the claw wheel is stopped after being flipped up by the claw wheel. The notch of the ratchet wheel may have a notch shape cut by a straight line connecting two points on the outer periphery of the ratchet wheel or a shape cut by a curve connecting two points on the circumference. It is desirable to provide a camshaft to which both the ratchet and the cam are attached. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic view of an embodiment of a power circuit breaker according to the present invention, showing a state in which a shut-off spring and a closing spring are both compressed. FIGS. 2 to 4 are shown in FIG. Fig. 2 is a diagram illustrating the operation of the circuit breaker shown, Fig. 2 is a diagram illustrating a transient state, Fig. 3 is a diagram illustrating a closing state, and Fig. 4 is a diagram illustrating a closing end state. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of an embodiment of the circuit breaker according to the present invention, and is a view showing a closed state. The circuit breaker according to the present embodiment includes a shutoff control unit having a main shaft 4 and a camshaft 2. It has a closing control section, a closing spring section whose one end is engaged with the main shaft 4, a closing spring section having a ratchet wheel 52 attached to the camshaft 2, and a contact section for turning on and off electric power. Then, the power is cut off by releasing the spring force of the blocking spring provided in the blocking spring portion, and the power is supplied by releasing the spring force of the closing spring portion. The shut-off spring is charged by the release of the closing spring, and the closing spring is charged by the drive motor of the driving claw. The contact part has a movable contact 32, one end of which is attached to the main shaft 4 and the other end of which forms a movable contact, a fixed contact 29b with which the movable end of the movable contact 32 contacts, and a movable contact. Has a fixed contact 29a which forms a rotating end of the contact.

The second main lever 5 b is attached to the main shaft 4 in the shut-off spring portion. .A blocking spring link 25 is attached to the other end of the second main lever 5b. 'When the main shaft 4 rotates, the blocking spring link 25 moves up and down. The lower portion of the cut-off spring link 25 is hollow, and a piston 36 is fitted to a stay provided in the hollow portion. The lower part of the piston is connected to a buffer 37. The inside of the buffer 37 is filled with a non-compressible fluid, for example, oil. A flange is formed at the lower end of the blocking spring link 25, and a blocking spring (blocking member) 26 is wound around the blocking spring link 25 using the flange as a stopper. The upper end of the blocking spring is pressed by the housing 1. The fluid inside the shock absorber 37 generates a braking energy by increasing the pressure when the shut-off spring link 25 collides with the piston 36. This braking energy is used to stop the movable contact 32 smoothly.

In the shutoff control section, a first main lever 5 a is attached to the main shaft 4. The first main lever 5a has a boomerang shape, a main shaft 4 penetrates the center, a roller 6 is mounted at one end, and another roller 7 is mounted at the other end. When the roller 6 comes into contact with an outer peripheral surface of the cam 3 described later, the load is transmitted from the cam 3. The roller 7 of the first main lever 5a and the second shutoff latch 8 can be engaged. One end of the second shut-off latch 8 is attached to the rotating shaft, and the other end is arranged to be able to engage with the roller 7.

A roller is provided in the middle of the second shut-off latch 8 to engage with the shut-off latch 11. Installed and return spring 9 is installed. A cut-off trigger 14a is arranged so as to be able to engage with a roller provided at the tip of the cut-off latch 11. The shut-off latch 11 and the shut-off trigger 14 a are freely rotatable, but their movements are restricted by the return springs 12 and 15. A shut-off trigger 14 b is also attached to the rotation axis of the shut-off trigger 14 a, and the shut-off trigger 14 b is arranged so that the plunger 17 of the solenoid contacts the shut-off trigger 14 b. The return springs 9, 12, 15 provided on the cutoff latch 11, the second cutoff latch 8, and the cutoff trigger 14a are always in a state where a spring force is applied. The return spring 9 is a compression coil spring, and the return springs 12 and 15 are torsion coil springs. The above is the shut-off control unit.

In the closing spring portion, a ratchet wheel 52 having a plurality of claws formed on an outer peripheral portion is attached to the force shaft 2. One end of a closing spring link 27 is eccentrically attached to the ratchet wheel 52. The other end of the closing spring link 27 is connected to a spring receiver 35. A closing spring 28 is located around the closing spring link 27. One end of the closing spring (loading member) 28 is held by a spring receiver 35, and the other end is held by the housing 1. The driving pawl 54 attached to the pawl shaft 56 is matched with the pawl of the pawl 52. The movement of the drive pawl 54 is regulated by a return spring 55 attached to the pawl shaft 56. A small gear 51 is also attached to the pawl shaft 56.

A cam 3 is mounted on the cam shaft 2, and a roller 18 is mounted on a part of the cam 3. A closing latch 19 is arranged so as to be engageable with the roller 18. The input latch 19 is rotatable around an axis around which the return spring 20 is wound. A closing trigger 22 is arranged so as to be engageable with a roller provided at an intermediate portion of the closing latch 19. The closing trigger 22 has a T-shape, and the intersection of the horizontal and vertical bars is the axis of rotation. A return spring 23 is wound around the rotation shaft. A solenoid plunger 24 is arranged so that it can contact the closing trigger 22.

The operation of the operating device of the power circuit breaker configured as described above is described in the throwing up diagram in Fig. 1, the shut-off state diagram in Fig. 2, the instantaneous diagram in the closing state in Fig. 3, and the closing end in Fig. 4. This will be described with reference to a state diagram. In FIG. 1, both the shut-off spring 26 and the closing spring 28 These are compression coil springs, both of which are in a compressed state.

In the state shown in FIG. 1, when a shutoff command is input, the shutoff solenoid is excited. The plunger 17 of the shutoff solenoid protrudes rightward in FIG. 1 and presses the shutoff trigger 14b. The breaking trigger 14 b overcomes the spring force of the return spring 15 and rotates the breaking trigger 14 clockwise. As a result, the engagement between the interruption trigger 14a formed coaxially with the interruption trigger 14b and the interruption latch 11 is released.

The cut-off latch 11 is released from the cut-off trigger 14a, and can be freely rotated. When the blocking latch 11 is free to rotate, the second blocking latch 8 is also free to rotate. Here, the second blocking latch since only are pressed by the roller 7 of the main lever ⁵ a from below, by the movement of the main lever 5 a, rotates counterclockwise. The return spring 9 is a compression coil spring, and acts to prevent this operation. Since the pressing force of the shut-off latch 11 that has restricted the movement of the main lever 15a from above is removed, the second shut-off latch 8 is free to rotate, and turns counterclockwise. Since the pressing force from the shut-off latch 8, which has restricted the downward movement of the shut-off spring 26, is removed, the shut-off spring 26 releases the spring force and pushes the shut-off spring link 25 downward. At this time, the cut-off spring 26 is in a full stroke state, and the cut-off spring link 25 is pressing the piston 36 of the shock absorber 37. ·

Since the blocking spring link 25 has moved downward, the main lever 5b rotates counterclockwise, and accordingly, the main lever 5a also rotates counterclockwise. The main lever 5a continues to rotate until the roller 6 at the end of the main lever 5a approaches the adjacent cam 3. When the main shaft 4 rotates counterclockwise, the movable contact 32 connected to the main shaft 4 moves downward, and the contact points 29a and 29b are opened. FIG. 2 shows a state in which the cutoff operation has been completed.

The closing operation of shifting from the shut-off state shown in FIG. 2 to the closing state shown in FIG. 1 will be described below. Energize the closing solenoid. The plunger 24 of the closing solenoid protrudes leftward in the figure and presses one end of a T-shaped closing trigger 22. Push The pressed closing trigger 22 overcomes the spring force of the return spring 23 and rotates the rotating shaft of the closing trigger 22 counterclockwise. When the closing trigger 22 rotates, the closing latch 19 rotates counterclockwise by the spring force of the return spring 20.

The closing spring link 27 eccentrically attached to the ratchet wheel 52 has reached near the top dead center, which is the highest position, due to the rotation of the ratchet wheel 52. This is achieved by driving the driving claw 54 with the torque transmitted from the electric motor (not shown) to the small gear 51. Since the closing latch 19 has rotated counterclockwise, the movement of the cam 3 is no longer restricted. As a result, only the spring force of the closing spring 28 acts on the camshaft 2 on which the cam 3 is mounted. The spring force of the closing spring 28 is released, and the closing spring link 27 is moved downward. When the closing spring link 27 moves, the ratchet wheel 52 and the force shaft 2 to which the hook spring 52 is attached rotate counterclockwise.

The cam 3 is rotated by the rotation of the cam shaft 2, and the roller 6 of the main lever 5a in contact with the cam is moved according to the cam curve as the force S of the roller 6 and the follower. This rotates the main lever 5a clockwise. This is shown in FIG.

When the cam 3 rotates approximately half a counterclockwise direction as the closing operation proceeds, the roller 3 of the main lever 5 and the cam 3 come into contact with each other at the maximum radius position of the cam 3. At the time of this contact, the main lever 5a and the main shaft 4 to which the main lever 5a is attached rotate clockwise about 60 degrees, and the cut-off spring link 25 connected to the main lever 5b is turned off by the cut-off spring 2 When 6 _t spindle 4 for compressing rotates, the pressing force from the contact 2 9 a, 2 9 b the main lever 5 a of the roller 7 that acts on the _t second blocking latch 8 which is closed by the movable contact 3 2 However, it is reduced by the cam action of the member provided in the vicinity of the roller 7. Therefore, the second shut-off latch 8 rotates clockwise by a force to open the return spring 9, and returns to the original position. Similarly, the breaking latch 11 returns to the original position by the restoring force of the return spring 12, and the breaking trigger 14 returns to the original position by the restoring force of the return spring 15.

FIG. 4 shows a state where the closing spring 28 is released and the ratchet wheel 52 is further rotated. Since the cam 3 has moved away from the main lever 5a, the main lever 5a tries to rotate counterclockwise due to the spring force of the compressed blocking spring 26. As mentioned above, Since the switch 11, the second cut-off latch 8 and the cut-off trigger 14 have returned to their original positions, the roller 7 of the main lever 5a and the second cut-off latch 8 are engaged, and the cut-off spring force is maintained, and the breaker Can maintain the closed state.

Since the closing spring 28 is released even after the cam 3 is separated from the main lever 5, the cam 3 continues to rotate counterclockwise. Then, the cam 3 gets over the bottom dead center by inertia force and starts to compress the closing spring 28. The cam 3 stops when the inertia force of the cam 3 and the spring force of the compressed closing spring 28 are balanced. The input spring 28 compressed even after the stop of the cam 3 rotates the cam 3 clockwise in an attempt to release the spring force. Thereafter, the cam 3 stops while swinging around the bottom dead center.

By the way, during the closing operation, the ratchet wheel 52 coaxial with the cam 3 also rotates counterclockwise. On the circumference 1Z4 of the ratchet wheel 52, a notch portion cut out in a truncated circular shape is formed. In addition, about 1/6 of the outer peripheral portion of the ratchet wheel 52 adjacent to the notch portion is circular, but does not form a pawl. In the state shown in FIG. 2, the driving pawl 54 is aligned with the pawl of the ratchet wheel 52, but as the pawl 52 rotates, the driving pawl 54 is disengaged from the pawl and is notched. Move around the part or circumference.

For example, in the state of FIG. 2 in which the driving of the driving claw 54 by the electric motor (not shown) is stopped, the ratchet wheel 52 rotates counterclockwise by the spring force of the closing spring 28. Accordingly, the ratchet engagement between the pawl of the ratchet wheel 52 and the driving pawl 54 is released. When the driving pawl 54 is pushed up by the pawl of the ratchet 52 to the maximum radial position of the ratchet 52, the driving pawl 54 rotates counterclockwise by the spring force of the return spring 55 thereafter. When the rotation of the ratchet further advances, the ratchet passes through the smooth circumferential portion of the ratchet 52 and hits the notch.

When the driving claw 54 passes over the notch, the driving claw 54 is flipped up by the corner of the ratchet wheel 52 as shown in FIG. Thereafter, the ratchet wheel 52 swings about the bottom dead center as described above, and finally stops. The driving claw 54 jumped up at the corner of the notch rotates counterclockwise by the spring force of the return spring 55 and hits the claw of the ratchet 52.

When the closing operation is completed, start the motor (not shown) and turn the small gear 51 counterclockwise. Drive. As a result, the pawl shaft 56 rotates counterclockwise, and one of the two driving pawls 54 engages with the pawl of the pawl 52, and rotates the pawl 52 counterclockwise. Rotate to. When the ratchet 5 2 rotates counterclockwise, the closing spring link 2

7 moves upward, and the closing spring 28 is compressed. When the cam 3 attached to the cam shaft rotates half a turn, the motor stops. At this time, the spring force of the closing spring 28 is to be released. The roller 18 of the cam 3 is engaged with the closing lever 19, and the closing lever 19 is engaged with the closing trigger 22. Is retained. That is, the closing spring 28 is maintained in a compressed state. When the motor is stopped, the drive pawl 54 is brought into contact with the claw-free circumferential portion of the ratchet wheel 52 so that the energy of the motor ′ is not transmitted to the input latch 19. This state is shown in FIG.

According to the present embodiment, the driving claws hit the ratchet while the ratchet 52 is stopped, so that the impact at the moment of collision is small, the engagement is stable, and the reliability is improved. In addition, the size and weight of the driving claw and the ratchet can be reduced, and the size and weight of the entire circuit breaker can be reduced.

In this embodiment, a compression coil spring is used as the cut-off spring and the closing spring. However, another elastic element, for example, a disc spring, a spiral spring, or a leaf spring may be used. In addition, for simplicity, the main lever is configured to move the movable contact up and down. However, a lever or a link that amplifies the stroke length of the movable contact may be provided between the main lever and the movable contact. Furthermore, in the present embodiment, the moment when the driving claw is jumped up is the moment when the cam 3 separates from the main lever 5a, but it may be after the two are completely separated.

Further, in this embodiment, the return springs provided on the closing latch and the closing trigger are always urged with elasticity, and these return springs are torsion coil springs. However, these may be other elastic elements.

The amount of bounce of the driving pawl 54 is determined by the shape of the notch of the ratchet 52. In the present embodiment, the notch portion is set at about 60 ° at the central angle, but the straight line of the notch is This angle is not limited as long as it penetrates deeper than the bottom circle of the tooth. The shape of the notch may be not only a shape obtained by cutting a circle with a single straight line but also a shape obtained by cutting the circumference with a plurality of straight lines, or a free-form curve connecting two points on the circumference. . In other words, the notch may be any structure that does not apply excessive impact force to the ratchet of the ratchet.

The present invention is not limited to the embodiment described above, but can be applied to, for example, an operating device having a plurality of closing springs and shutoff springs. In the present embodiment, two shut-off latches are used. However, only a shut-off trigger may be provided, or a plurality of shut-off latches may be provided. Similarly, the closing side may have no closing latch or may have a plurality of closing latches.

As described above, according to the present invention, at the end of the closing operation, the driving claw is flipped up while the ratchet is swinging about the bottom dead center, and the driving claw and the pawl are stopped after the pawl is stopped. Since the hook of the wheel is engaged, the impact on the hook of the wheel and the driving nail is reduced, and the reliability is improved. In addition, it is possible to reduce the size and weight of components such as the driving claw and the ratchet wheel, thereby realizing a smaller and lighter overall circuit breaker.

Claims

, The scope of the claims

1. Power for switching power on and off by the spring force of the closing spring and the closing spring

'' In the breaker, a closing spring link that expands and contracts the closing spring, and a hook that has the closing spring link attached thereto, and a driving claw that matches this hook are provided.

5 A power circuit breaker characterized by a chipped shape.

2. The electric power supply according to claim 1, wherein a plurality of claws are formed on an outer peripheral portion of the ratchet wheel, except for a notch portion and a portion adjacent to the notch portion. Circuit breaker.

3. When the power is turned on, the engagement between the ratchet and the driving pawl is released, and the notch 0 of the ratchet is fitted to the pawl provided on the outer periphery of the pawl after passing the driving pawl. The power circuit breaker according to claim 1, characterized in that: ,

4. The power circuit breaker according to claim 1, wherein the notch has a truncated circular shape.

5. The power circuit breaker according to claim 1, wherein a polygon is formed in the cutout portion.

6. The power circuit breaker according to claim 1, wherein the notch has a shape obtained by cutting a circle with a curve. '

7. The power circuit breaker according to claim 1, wherein the notch is formed at a center angle of about 60 degrees.

0 8. An interrupting unit that opens and closes a contact having a fixed contact and a movable contact to switch between shutting off and inputting power, an interrupting member and an input member that opens and closes the contact by releasing strain energy. In a power circuit breaker including a ratchet for storing strain energy in the input member and a driving pawl for transmitting power to the pawl, an outer peripheral surface of the pawl includes a plurality of claws engaged with the driving pawl. A power circuit breaker, comprising: a claw portion having the claw portion; and a notch portion having no claw portion formed therein, wherein the driving claw contacts the notch portion of the ratchet wheel during a closing operation.

9. Dissipate the strain energy stored in the input member and apply the strain energy to the A cam lever for accumulating energy is provided, and when the driving pawl comes into contact with the circumferential surface from the notch of the pawl, the driving pawl is moved up after being flipped up by the pawl. 9. The power circuit breaker according to claim 8, wherein the chopper contacts the claw portion after stopping.

10. The power circuit breaker according to claim 8, wherein the notch portion of the ratchet wheel has a shape cut along a straight line connecting two points on the outer periphery of the ratchet wheel.

11. The power circuit breaker according to claim 8, wherein the notch of the ratchet has a shape cut by a curve connecting two points on a circumference.

12. The power circuit breaker according to claim 8, wherein a camshaft to which both the ratchet wheel and the cam are attached is provided.