JPS6340228A - Circuit breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is directed to electromagnetic repulsion that acts between a first contact and a second contact due to a large current caused by a short circuit accident, etc. The present invention relates to a circuit breaker configured to separate a second contact from a first contact by force.

(Prior art) As this type of circuit breaker, for example, Japanese Patent Laid-Open No. 60-1
There is one disclosed in Japanese Patent No. 51924, and a schematic configuration thereof is shown in FIG. That is, 1 is a first contact whose one end is rotatably supported by a shaft 2, has a contact portion 1a on the upper surface of the other end, and is supported by a coil spring 3 on the lower surface of the other end. has been done.

A crossbar 4 is rotatably supported by a base (not shown) and has a storage recess 5. 6 has the first
The second contact has a contact part 6a that comes into contact with and separates from the contact part 1a of the contact 1, and the other end is located in the storage recess 5 of the loss spar 4 and rotates to the crossbar 4 via the support 7. The first contact 1 is supported in a substantially straight line with the first contact 1 at the contact position (circuit closing position) shown in the figure. 8
is a lower link constituting a part of the operating mechanism, the lower end of which is rotatably connected to the shaft 7. Although not shown, the operating device ↑j7i is operated in response to manual operation of an operating handle and activation of a tripping device that is activated based on detection of overcurrent.

Reference numeral 9 is attached with a pin, and is positioned within the storage recess 5 and supported by the crossbar 4. Reference numeral 10 denotes a stop pin, which is provided at the other end of the second contact 6 so as to penetrate therethrough. Reference numeral 11 denotes a torsion spring wound around the pin 9, one end of which engages with the inner surface of the storage recess 5, and the other end of which engages with the stop pin 10 that protrudes laterally from the second contact 6. The contact portion 6a of the second contact 6 is always in contact with the first contact 1.
It is biased in the direction of contacting the contact portion 1a. In this case, two torsion springs 11 are provided so as to be located on both sides of the second contactor 6 (only one is shown in the figure).

Thus, as shown in the figure, the first and second contacts 1 and 6
When the operation handle is operated manually in a state in which the two movable contacts 6 are in contact with each other (closed circuit state @), the lower link 8 of the operation mechanism moves upward, and the second movable contact 6 is integrated with the crossbar 4. When the tripping device detects an overcurrent, the lower link 8 rotates in the clockwise direction by 51° and moves to an open circuit position (not shown).
Similarly, as the cross bar 4 moves upward, the second contact 6 rotates clockwise together with the cross bar 4 and moves to a trip position (not shown). On the other hand, when a large current occurs due to a short circuit "1", currents flowing in opposite directions to the first contact 1 and the second contact 6 act between them. When the electromagnetic repulsive force exceeds a predetermined value, the second contact 6
resists the biasing force of the torsion spring 11, rotates independently around the support 7 in the clockwise direction, and separates from the first contact 1.

Thereafter, the trip state occurs based on the activation of the tripping device described in section 2. This protects the main circuit from short-circuit accidents and the like.

(Problems to be Solved by the Invention) In the case of the above (13-piece), the torsion spring 11 is provided in the storage recess 5 of the crossbar 4, so the torsion spring 11 is supported on the side wall of the storage recess 5. For mounting, it is necessary to form a hole or groove for attaching the pin 9. However, since the hole or groove is the inner surface of the storage recess 5, it is not necessary to provide it when molding the cross bar 4. Also, even if the cross bar 4 is formed by machining after being formed, it is difficult to form the cross bar 4, and therefore the cross bar 4 has the disadvantage of being difficult to process. It had to be assembled into a narrow space called the storage recess 5, which also had the disadvantage of being difficult to assemble.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a circuit breaker whose crossbars can be easily processed and which can be easily assembled.

[Structure of the Invention] (Means for Solving the Problems) The circuit breaker of the present invention includes: a first contact having a contact portion; a crossbar rotatably supported and having a storage recess; One end has a contact part that comes into contact with and separates from the contact part of the first contact, and the other end is located in the storage recess and is rotatably supported by the crossbar, and the first contact is connected based on a large current. A second contact rotates in a direction away from the first contact due to an electromagnetic repulsive force acting between the second contact and the second contact, and the second contact is rotated together with a crossbar between a closed position and an open position. an opening/closing mechanism for rotating, a protrusion provided in the storage recess of the crossbar, and a pin provided at the other end of the second contact;
Wrapped around this pin, when one end engages the second contact, the other end engages the protrusion of the crossbar, and the second contact is always brought into contact with the first contact. a torsion spring that urges the second contact to rotate independently in a direction away from the first contact when the electromagnetic repulsive force based on the large current exceeds a predetermined value; 1M).

(Function) In the above configuration, by providing the second contact with a pin that supports the torsion spring, it is not necessary to form a hole or the like in the housing recess of the crossbar to attach the pin. Further, since it is sufficient to attach the pin and the torsion spring to the second contact and then attach the second contact to the crossbar in this state, the pin and the torsion spring can be easily attached.

(Embodiment) An embodiment in which the present invention is applied to a three-phase circuit breaker will be described below with reference to FIGS. 1 to 5.

First, in FIG. 3 showing the overall configuration, 21 is the entire case, 22 is a first contact having a contact portion 22a at one end, which is fixed to the case 21, and the other end is connected to the power supply side terminal 23. has been done. 24 is a crossbar, as shown in Figures 4 and 5.
As shown in the figure, it has storage recesses 25 in three places, and
The groove portion 28 of the support portion 27 has protruding stripes 26.26 on the outer periphery between the storage recesses 25, and the protruding stripes 26.26 protrude from the case 21 as shown in FIG. 28, so that it is rotatably supported by the support portion 27.27. 29 has the first contact 22 at one end.
A second contact has a contact part 29a that comes into contact with and separates from the contact part 22a of the second contact part, and also has a support member 30, the other end of which is located in the accommodation recess 25 of the cross bar 24, and a shaft passing through the support member 30. 31 to be rotatably supported by the cross bar 24, and one end thereof is approximately parallel to the first contact 22 at the contact position (closed circuit position) with the first contact 22 shown in FIG. . A flexible conductor 32 has one end connected to the lower surface of the other end of the second movable contactor 29, and the other end is connected to the load side terminal 33 via a tripping device 42, which will be described later. . On the other hand, 34 is the operating device f, +4, which is +11 from the operating handle 35, handle receiver 36, catch 37, upper link 38, lower link 39, toggle spring 40, etc.
has been completed. One end of the toggle spring 40 is hooked to the upper end 9 of the handle receiver 36, and the other end is hooked to a connecting shaft 41 that connects the upper link 38 and the lower link 39. The lower end of the lower link 39 is connected to a shaft 31 that supports the second contact 29. 4
2 is near the tripping device, which is composed of a bimetal 43, an armature 44, a trip actuator 45, a catch receiver 46, and the like.

One end of the catch receiver 46 is engaged with one end of the catch 37 of the operating mechanism 34 shown in -.

In this case, by operating the operating handle 35, the second contact 29 is connected to the crossbar 2 via the operating device +M 34.
4, it is rotated between a closed position and an open position (not shown) rotated clockwise from this position. Further, when the tripping device 42 detects an overcurrent, the armature 44 is attracted downward, so that the trip actuation plate 45 rotates counterclockwise around the shaft 45a. 45 is disengaged from the catch receiver 46, and the catch receiver 46 rotates clockwise about the shaft 46a, and the catch receiver 4G is disengaged from the catch 37, whereby the operating mechanism 34 operates and connects the second contact 29 to the crossbar 2
4 from the closed circuit position to the trip position (not shown).

-1-1z The cross spar 24 is provided with a protrusion 47 that protrudes forward at the rear of the storage recess 25, as shown in FIG. A pin 48 is provided at the other end (right end) of the second contact 29 through the support member 30, and a torsion spring 49 is wound around this pin 48. One end 49a of the torsion spring 49 engages with the second contact 29, and the other end 49b engages with the protrusion 47 of the storage recess 25 from above, and the second contact 29 is normally engaged with the torsion spring 49. With the support 31 as a fulcrum, the contact portion 29a contacts the first contact 22, and the d portion 22a
It is biased to rotate in the direction in which it contacts, that is, in the counterclockwise direction. In this case, the tip of the other end 49b of the torsion spring 49 is bent in an inverted shape. In this case, in the event of a large current such as a short circuit accident, the first contact 22 and the second contact 2
When the electromagnetic repulsion force acting between the two contacts 9 exceeds a predetermined value due to currents flowing in opposite directions to each other, the second contact 29 releases the torsion spring before the tripping device 42 operates. It rotates 11 clockwise around the shaft 31 against the biasing force of 49, and separates from the first contact 22 as shown in FIG.

During this folding, the other end 49b of the torsion spring 49 slides on the upper surface of the protrusion 47, and the tip of the other end 49b beyond the bent portion engages with the protrusion 47, so that the second contact 29 is The biasing force of the torsion spring 49 decreases. After the second contact 29 independently rotates in this way, the second contact 29 is moved to the crossbar 2 based on the operation of the tripping device 42.
4 to rotate integrally to the trip position.

In addition, in FIG. 3, 50 is a well-known arc extinguishing device 1
f5s51 is a magnetic drive device constructed by laminating a large number of approximately U-shaped steel plates. The magnetic field generated when a large current flows between the second contacts 22 and 29 due to a short circuit accident is concentrated to concentrate the magnetic field between the first contacts 22 and 29 during separation. The first and second contacts significantly increase the electromagnetic repulsion force acting between the second contacts 22 and 29, causing the second contacts 29 to quickly separate from the first contacts 22. 22 and 29
It is located near.

According to the above embodiment, the second contact 29 is provided with the pin 48 for attaching the torsion spring 49 that urges the second contact 29 to contact the first contact 22. Unlike the conventional structure in which a pin 9 is provided for mounting the torsion spring 11 in the storage recess 5 of the cross bar 4, the storage recess 25 of the cross bar 24 has a hole etc. for installing the pin 48. No machining is required, so the cross bar 24 can be easily machined. In this case, a protrusion 47 that engages with the torsion spring 49 is formed in the IBM recess 25 of the cross bar 24, but this protrusion 47 can be easily formed when the cross bar 24 is molded. Also, when assembling, the second contact 2
The pin 48 and torsion spring 49 can be attached to the pin 9 and the second contact 29 can be attached to the crossbar 24 in this state. Unlike the case where the pin 48 and the torsion spring 49 are assembled, the pin 48 and the torsion spring 49 can be installed in a wide area away from the storage recess 25, and therefore assembly can be easily performed.

In addition, especially according to the above embodiment, since the torsion spring 49 is provided at the center of the other end of the second contact 29, only one torsion spring 49 is required, and the torsion spring 11
The structure can be simplified compared to a structure in which the contacts are provided on both sides of the second contactor 6, respectively.

It should be noted that the present invention is not limited only to the embodiments described above and shown in the drawings; for example, although a three-phase circuit breaker was illustrated in the above embodiments, it can also be applied to other devices. It can be implemented with appropriate changes within the scope of the above.

[Effects of the Invention] As is clear from the description below, the circuit breaker of the present invention includes a torsion spring that urges the second contact to contact the first contact, and a torsion spring that biases the second contact to contact the first contact. Since the pin supporting the crossbar is attached to the second contact, the crossbar can be easily processed and assembled, which is an excellent effect.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a vertical sectional view of the main part in a state where the first contact and the second contact are in contact, and FIG. Fig. 1 is a view equivalent to Fig. 1 in which the contactor No. 2 rotates independently, Fig. 3 is a longitudinal sectional view of the whole, Fig. 4 is a side view of the crossbar as seen from the load side, and Fig. 5 is a diagram of the crossbar.
FIG. Figure 6 shows the conventional configuration.
It is a figure equivalent figure. In the drawing, 22 and 22a are first contacts and their contact parts, 24 is a crossbar 125 is a storage recess, 29 and 29a
34 is a second contactor and its contact portion; 34 is an operating mechanism; 42
is a tripping device, 47 is a protrusion, 48 is a pin, and 49 is a torsion spring.

Claims (1)

[Claims] 1. A first contact having a contact portion, a cross bar that is rotatably supported and has a storage recess, and a contact portion that comes into contact with and separates from the contact portion of the first contact at one end. The other end is located in the storage recess, is rotatably supported by the crossbar, and moves away from the first contact due to electromagnetic repulsion that acts between it and the first contact based on a large current. a second contact that rotates, an opening/closing mechanism that rotates the second contact together with a crossbar between a closed position and an open position, and a protrusion provided in a storage recess of the crossbar; A pin is provided at the other end of the second contact, and the pin is wound around the pin so that one end engages the second contact and the other end engages the protrusion of the cross bar. the second contactor to the first contactor;
When the electromagnetic repulsive force based on the large current exceeds a predetermined value, the second contact is allowed to rotate independently in a direction away from the first contact. A circuit breaker comprising a torsion spring.