WO1999010906A1

WO1999010906A1 - Breaker

Info

Publication number: WO1999010906A1
Application number: PCT/JP1998/001155
Authority: WO
Inventors: Hiroaki Hashimoto; Masaaki Takayanagi; Masaki Nakagawa; Kenichi Ookubo
Original assignee: Hitachi, Ltd.
Priority date: 1997-08-26
Filing date: 1998-03-18
Publication date: 1999-03-04
Also published as: JP3497866B2; KR100326725B1; KR20010023320A

Abstract

A breaker has a cutoff spring, a tripping lever which is supported rotatably and turned by the driving force of the cutoff spring, a holding lever which is supported rotatably and lockingly holds the tripping lever in the closed state of the breaker, a holding lever restoring spring which applies a force to the holding lever so as to return the holding lever to the closed state and an electromagnet which operates so as to release the engagement between the tripping lever and the holding lever at the time of the breaking operation. An acceleration spring which moves the holding lever in the direction where the engagement between the holding lever and the tripping lever is cancelled is provided, and an acceleration spring operation mechanism which holds the acceleration spring in an energy storing state or releases the acceleration spring from the energy storing state is provided. Thus, the time required for the release of the engagement between the holding lever and the tripping lever can be reduced, the high speed breaking operation of the breaker can be realized and, further, the size and cost of the breaker can be reduced.

Description

Specification

Circuit breaker technical field

The present invention relates to a circuit breaker, and more particularly to a circuit breaker suitable for electric power. Background art

As a conventional circuit breaker, a circuit breaker is engaged with a tripping spring, which is rotatably supported and rotated by receiving a driving force of the spring, when the circuit breaker is closed. A holding lever for holding, a trigger lever for engaging and holding the holding lever in a closed state of the circuit breaker, and a releasing lever for releasing the engagement of the holding lever and the holding lever during the breaking operation. 2. Description of the Related Art A circuit breaker is known which includes an electromagnet that operates so as to release the engagement, and a force applying unit that increases a force applied to a trigger lever during a breaking operation. For example, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 9-218181.

This circuit breaker trips the drive force of the cut-off spring in the closed state and holds it with a multi-stage lever such as a lever, holding lever, and trigger lever. The purpose is to reduce the time required to release the engagement between the trigger lever and the holding lever by using the moment of force from the force piston.

The conventional breaker does not relate to the shortening of the release time in the engagement between the retaining lever and the trip lever, which require the shortest release time. Is not enough.

An object of the present invention is to provide a circuit breaker that can speed up the breaking operation of the entire circuit breaker by shortening the time required for disengagement of the holding reno <1 and the tripping reno. Another object of the present invention is to provide a small and inexpensive circuit breaker while increasing the speed. Disclosure of the invention

The present invention provides a shut-off spring, a trip lever that is rotatably supported and is rotated by the driving force of the shut-off spring, and a trip lever that is rotatably supported and the trip lever is turned into the breaker. A circuit breaker comprising: a holding lever that is engaged and held in a state; and an electromagnet that operates to release the engagement between the bow 1 release lever and the holding lever during a breaking operation. An accelerating spring for applying a force to the holding lever in a direction in which the engagement with the trip lever is released is provided.

Further, according to the present invention, in the above-described circuit breaker, the direction of the pressing force applied to a portion of the trip lever held by the holding lever in engagement with the holding lever is set to be substantially the center of rotation of the holding lever. Further, the holding lever is formed in a substantially L-shape, the center portion thereof is rotatably supported, the trip lever is engaged with one end of the holding lever, and the acceleration spring is mounted. The accelerating spring is formed inside the other end of the holding lever and formed of a compression coil spring. Further, the accelerating spring is formed of a compression coil spring and contacts the holding lever. A plate is mounted on the side to be in contact with, as an acceleration spring operating mechanism, an acceleration spring lever rotatably supported, and a rod for connecting the acceleration spring lever to the plate through the acceleration spring.

Further, according to the present invention, in the above-described circuit breaker, the acceleration spring is formed by a compression coil spring, and a plate is mounted on a side that comes into contact with the holding lever. The acceleration spring lever rotatably supported as an acceleration spring operating mechanism. And a rod for connecting the acceleration spring lever to the plate through the acceleration spring.

With the above circuit breaker, the time required to disengage the holding lever and the trip lever can be shortened, and the breaking operation of the entire circuit breaker can be accelerated, and a small and inexpensive circuit breaker can be obtained. be able to. BRIEF DESCRIPTION OF THE FIGURES P

Three

FIG. 1 is a configuration diagram showing a closed state of a circuit breaker control unit of the circuit breaker of the present invention. FIG. 2 is a configuration diagram of the tripping lever operating device of the circuit breaker of the present invention at the start of a breaking operation. FIG. 3 is a configuration diagram showing a closed state of the circuit breaker of the present invention. FIG. 4 is a configuration diagram of the circuit breaker of the present invention during a breaking operation. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4.

The main contact 1 of the interrupting section is closed as shown in FIG. 3 in the closed state, and is opened as shown in FIG. 4 in the interrupted state. The cut-off spring 2 is formed by a coil spring, and is constantly urged in the direction of arrow F in a charged state. The driving force F of the shut-off spring 2 is transmitted to the link 7 via drive mechanisms such as the lever 3, the links 4, 5 and the lever 6. The link 7 is provided with a force E in the pulling direction of the driving force in the closed state. One end of the bow I release lever 8 is rotatably supported by a pin 9, and a rotational moment D is given by a link 7. The holding lever 11 is formed in a substantially L-shape, and its center is rotatably supported by the pin 13. The pin 10 is engaged with the roller 10 so that a force toward the center of the pin 13 is applied. The direction of the contact load is desirably within the range of the shaft diameter of the pin 13. The holding lever 1 return spring 14 is always in contact with the lower surface of the horizontal portion of the holding lever 11 and operates so as to always elastically urge the holding lever 11 counterclockwise to return to the closed state. An acceleration spring 15 using a compression coil spring as the elastic urging member is disposed to face the upper surface of the horizontal portion of the holding lever 11. The spring force of the acceleration spring 15 is set to be larger than the spring force of the holding lever return spring 14. A plate 16 that presses the holding lever 11 is attached to one end of the holding lever 11 that holds the acceleration spring 15. The plate 16 is connected to the acceleration spring lever 18 via a rod 17. The rod 17 passes through the acceleration spring 15. The accelerating spring lever 18 has one end rotatably supported by a pin 19 and the other end engaged with the roller 32 of the reset lever 31. The reset lever 31 has one end The other end is locked by the trip hook 20 in the closed state, and the roller 32 engages with the notched surface of the reset cam 35 during the shut-off operation. I have. The center of the trip hook 20 is rotatably supported by the pin 21, one end is engaged with the reset lever 31 in a closed state, and the other end faces the plunger 23 a of the electromagnet 23. are doing. The electromagnet 23 is attached to the housing 51, and its plunger 23a extends through the housing 51 to the upper surface of the other end of the trip hook 20.

Next, the operation of the circuit breaker will be described. In the closed state shown in FIGS. 1 and 3, when a cutoff command is input, the electromagnet 23 is excited, and the plunger 23 protrudes downward and presses the upper surface of the other end of the trip hook 20. . As a result, the trip hook 20 is rotated in the direction of arrow A to release the lock between the locking portion 20a of the trip hook 20 and the reset lever 31. When the lock between the trip hook 20 and the reset lever 31 is released, the reset lever 31 rotates counterclockwise due to the contact load of the acceleration spring lever-18 and the roller 32 is reset. It rotates until it comes into contact with the notch of cam 35. The acceleration spring lever 18 can freely rotate in the direction of arrow B around the pin 19. As a result, the accumulating state of the acceleration spring 15 is released, and the acceleration spring 15 presses the upper surface of the horizontal portion of the holding lever 11 via the plate 16. Since the spring force of the acceleration spring 15 is set to be greater than the spring force of the holding lever return spring 14, the spring force of the holding lever return spring 14 is overcome and the holding lever 1 Rotate in the direction of arrow C around. When the holding lever 11 rotates, the engagement between the holding lever 11 and the roller 10 is released, and the tripping lever 8 is moved in the direction of arrow D around the pin 9 by the driving force of the shut-off spring 2. Turning, link 7 moves in the direction of arrow E. Thus, the drive mechanism shifts from the state of FIG. 3 to the state of FIG. That is, the breaking spring 2 starts releasing in the direction of arrow F, and the breaking section main contact 1 opens. Thereafter, by rotating the reset cam 35 clockwise, the state shown in FIG. 1 can be returned.

According to such a circuit breaker, the spring force of the accelerating spring 15 accumulated during the breaking operation is Is applied to the holding lever 11, so that the time for releasing the engagement between the holding lever 11 and the roller 10 can be reduced. This can speed up the breaking operation of the entire circuit breaker.

In addition, since the direction of the contact load acting on the holding lever 11 from the roller 10 of the bow I removing lever 8 is set to be substantially the direction of the rotation center of the holding lever 11, the roller 10 is moved from the roller 10 in the closed state. No rotating force acts on the holding lever 1 1. This makes it possible to reduce the size of the holding lever 11.

Further, the holding lever 11 is formed in a substantially L-shape to rotatably support a central portion thereof, and a trip lever 8 is engaged with a tip of one side of the holding lever 11 to engage the acceleration lever. Since the spring 15 is formed by a compression coil spring and the acceleration spring 15 is arranged inside the other end of the holding lever 11, acceleration is performed by using the extra space formed by the holding lever 11. The spring 15 can be stored, and the circuit breaker can be downsized.

In addition, as an acceleration spring operating mechanism, an acceleration spring lever 18 rotatably supported on one side and held on the other side, and a central portion of the acceleration spring lever 18 is connected to a plate 16. Since the acceleration spring 15 is provided with the rod 17, the acceleration spring 15 is held by the leverage principle of the acceleration spring lever 18, and can be held with a small force. Also, as an acceleration spring operating mechanism, a reset lever 31 that is rotatably supported and engages the acceleration spring lever 18 and a reset lever 31 that is located farther from the engagement portion of the acceleration spring lever 18 And the release hook 20 which is released by the electromagnet 23 and is released by the electromagnet 23.Therefore, the force required to lock the reset lever 31 with the release hook 20 by the leverage principle may be small. 23 The required electromagnetic force can be reduced. As a result, the acceleration spring operating mechanism can be made inexpensive.

As described above, according to the present invention, the disengagement time between the holding lever and the trip lever can be shortened, and the breaking operation of the entire circuit breaker can be performed at a high speed. An inexpensive circuit breaker can be obtained. The present invention can be embodied in various other forms without departing from the spirit or main characteristics. As such, the preferred embodiments described herein are illustrative and not limiting. The scope of the invention is indicated by the appended claims, and all modifications that come within the meaning of the claims are intended to be included within the scope of the invention.

Claims

The scope of the claims

1. A tripping spring, a tripping lever that is rotatably supported and rotated by receiving the driving force of the tripping spring, and a tripping lever that is rotatably supported and is engaged with the circuit breaker closed. A circuit breaker comprising: a holding lever for holding together; and an electromagnet operating to release the engagement between the trip lever and the holding lever during a breaking operation, wherein the holding lever and the trip lever are provided. A circuit breaker characterized in that an acceleration spring is provided for applying a force to the holding lever in a direction in which the engagement of the lever is released.

2. The direction in which the pressure applied to the portion of the tripping lever held by the holding lever that engages with the holding lever is substantially in the direction of the center of rotation of the holding lever. Circuit breaker according to 1.

3. The holding lever is formed in a substantially L-shape and its center is rotatably supported. The trip lever is engaged with one end of the holding lever to compress the acceleration spring. 2. The circuit breaker according to claim 1, wherein the acceleration spring is formed of a spring, and the acceleration spring is disposed inside a distal end portion of the other side of the holding lever.

4. The acceleration spring is formed by a compression coil spring, and a plate is attached to a side that comes into contact with the holding lever. As an acceleration spring operating mechanism, a rotatably supported acceleration spring lever is provided. The circuit breaker according to claim 1, further comprising a rod connected to the plate through the acceleration spring.

5. As an acceleration spring operating mechanism, a rotatably supported acceleration spring lever, a rod connecting the acceleration spring lever to the plate, and a rotatably supported and engaged acceleration spring lever. A reset cam, a reset cam for returning the reset lever to the closed state, and a trip hook for holding the reset lever in the closed state and releasing the closed state by the electromagnet. The circuit breaker according to claim 1.

6. The holding lever is rotatably supported by a pin, and the direction of the pressure applied to the engaging portion of the holding lever of the trip lever is within the range of the shaft diameter of the pin. 3. The circuit breaker according to claim 2.

7. A breaking portion main contact, a breaking spring, a driving mechanism that is acted upon by the breaking spring to drive the breaking portion main contact and the trip lever, and is rotatably supported and rotated by the driving mechanism. A trip lever, a holding lever that is rotatably supported and engages and holds the trip lever in the closed state of the circuit breaker, and a holding lever that applies a force to return the holding lever to the closed state. In a circuit breaker having a return spring and an electromagnet that operates to release the engagement between the trip lever and the holding lever during a shutoff operation, the engagement between the holding lever and the trip lever is reduced. An acceleration spring that applies the holding lever in a direction in which the acceleration lever is released is provided, and an acceleration spring operating mechanism that holds or releases the accelerating spring in a charged state is provided. The acceleration spring is rotatably supported as the acceleration spring operating mechanism. Addition A spring lever, a rod connecting the acceleration spring lever to the plate, a reset lever supported rotatably and engaging the acceleration spring lever, and returning the reset lever to a closed state. A reset cam, a trip hook for holding the reset lever in the closed state and releasing the closed state by the electromagnet, and an acceleration spring operating mechanism for holding or releasing the acceleration spring in the charged state. A circuit breaker characterized in that: