KR900010512Y1 - Circuit breaker - Google Patents

Abstract

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Description

Circuit breaker

The figure shows one embodiment of the present invention, Figure 1 is a perspective view of a fixed frame.

2 is a longitudinal side view of the whole.

3 is a longitudinal sectional side view of the main portion in a closed state.

4 is a longitudinal side view of the yaw view in the trip state;

5 is a perspective view of the catch and toggle link mechanism.

The present invention relates to a circuit breaker equipped with a stopper for preventing a springing movement immediately after the opening operation of the movable contactor.

As is well known, the circuit breaker includes a fixed contactor which opens and closes the main circuit, a movable contactor, a toggle link mechanism for giving a rotational movement to the movable contactor, and an automatic tripping mechanism for giving an operation displacement to the togglelink mechanism. In such a circuit breaker, the automatic trap mechanism becomes an overcurrent or short-circuit current detector and is configured to rapidly open the movable contact by transferring the mechanical displacement resulting from the detection to the toggle link mechanism. A regulating stopper is provided for regulating the rotational angle of the movable contactor in the open direction constantly. Therefore, when the movable contactor collides with the regulating stopper, the phenomenon occurs when the movable contactor jumps toward the fixed contactor. If such a popping phenomenon occurs, the arc cutting performance between the two contacts may be degraded and the large current blocking performance may be resisted. For this reason, conventionally, as shown in Japanese Patent Application Laid-Open No. 52-73765 or Japanese Patent Application Laid-Open No. 52-11569, an auxiliary stopper for preventing the movable contact from jumping off immediately after the opening operation is provided.

Conventionally, when such an auxiliary stopper is installed, there is a drawback that the number of parts increases and the cost increases when the auxiliary stopper is installed. On the other hand, in the case where the auxiliary stopper is integrally formed on the fixing frame for supporting the rotating member such as the toggle link mechanism, it is difficult to take a high degree to adopt the bending processing, and furthermore, the bent portion is easily deformed. Since it lowers, there existed a fault to reduce reliability. In addition, there is a drawback that the shape is complicated and the manufacturing cost is too high compared to the product so that the fixed frame and the auxiliary stopper are not supported once.

An object of the present invention is to provide a stopper for preventing the bouncing motion immediately after the opening operation of the movable contactor without increasing the number of parts and to form a simple shape that is easy to manufacture, and also to improve the accuracy and reliability. To provide.

In the present invention, a toggle link mechanism for converting a rotational motion of a handle for opening and closing a circuit into linear motion, and a cross section holding the toggle link mechanism The movable contactor attached to the contact arm support rotated by the linear movement of the fixed frame and the toggle link mechanism formed in a magnetic shape, and the fixed contactor folded in the movable contactor, the cross section being approximately It is formed in a magnetic shape and pivotally engages the link of the toggle link mechanism, and is polymerized and disposed inside it so as to be rotatable with respect to a fixed frame. A circuit breaker having a catch of a toggle link mechanism for opening and a bumping means for regulating the limit of rotation of a contact arm support during opening, wherein the fixing frame is integrally formed by extruding both side walls facing each other. Has a stopper part for contacting the link when the movable contact is opened and regulating the recoil rotation of the link after opening and the stopper part for regulating the stop position of the link when the movable contactor is in contact with the fixed contact. A stopper was installed.

When the trip device detects an overcurrent, the mechanical restraint on the catch is released and the link of the toggle link mechanism is rapidly rotated in contact with the movable contact to be opened from the fixed contact. After opening, the contact arm support provided with the movable contactor collides with the stop means and tries to recoil, but the link of the toggle link mechanism is in contact with the stopper, so that the reaction between the link and the contact arm support connected thereto is prevented. In addition, when the circuit is normally closed and the movable contactor is in contact with the fixed contactor, the linkage contacts the other part of the stopper and its position is regulated, so that the contact pressure of the contactor is kept constant.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a case made of an insulating material having a cover 2, a fixed conductor 3 is fixed to the bottom thereof, a fixed contact 4 is fixedly attached to one end, and the other end is a power supply side terminal. 5 is a contact arm, one end of which is attached to the contact arm support 7 pivoted about the crossbar 6, and the other end is provided with a movable contact 8 which is folded with the fixed contact 4. 9 is an arc extinguishing device for arcing that occurs between both contacts 4 and 8.

Toggle mechanism for pivoting contact arm support 7, with upper link 11 and lower link 12, one end of upper link 11 catch 14 by pin 13 and one end of lower link 12 pin 15 by contact arm support 7 And the other ends of both links 11 and 12 are pivotally connected by pin 16, respectively.

Catch 14 is shown in Figure 5 The lower portion of the rear surface which is formed in a magnetic shape and is perpendicular to both side walls facing each other is projected to both sides, which is the catch axis 17. 18 is shown in FIG. It is a fixed frame formed in the shape of a child and arranged at the bottom of the case 1, and the through hole 19 is provided in the site | part which opposes each other. A catch shaft 17 is inserted through this through hole 19, and the catch 14 is pivotally supported on the fixed frame 18 so that the side wall of the fixed frame 18 and the side wall of the catch 14 are polymerized.

20 is a casting spring and is pulled between pin 16 and the manual handle 21, thereby forcing the catch 14 to rotate counterclockwise. 22 is a tripping device which is an automatic tripping mechanism. In general, the latch 23 latches the tip 14a of the catch 14, and the latch 23 catches the catch 14 when the tripping device 22 detects an overcurrent or a short-circuit current. Is supposed to release.

24 is a catch stopper provided on the inner side of both side walls of the fixed frame 18. The latch 23 releases the catch 14 by the automatic tripping mechanism, and when the catch 14 is rotated counterclockwise, it stops and stops. To stop it.

25 is a stopper of the upper link, and as shown in FIG. 1, a part of the opposing side walls of the fixed frame 18 is extruded inwardly by using a press means to be integrally formed. It has the stopper part 25b. The stopper portion 25a at the time of tripping is the contact arm support 7 rotated by the operation of the toggle link mechanism 10 accompanied by the rotation movement of the catch 15, in which the trip device 22, which is an automatic tripping mechanism, is released, and the rear end 14b of the catch 14 The upper link 11 is provided to be in contact with the upper link 11 when the movable contact 8 is in the open position in contact with the upper end.

Normally, the stopper portion 25b is provided so as to abut the upper link 11 in a normal ferro-phase so that the upper link 11 and the lower link 12 are approximately straight.

Next, the operation of the above configuration will be described. First, as shown in Figs. 2 and 3, in the normal closing state (state shown in Fig. 2) in which the distal end portion 14a of the catch 14 is caught by the latch 23 and stopped, and the manual operation handle 21 is set to the ON position. As shown in FIG. 3, the upper link 11 is urged by the casting spring 20, and as described above, the upper link 11 and the lower link 12 are held in a substantially straight line in contact with the ferro stopper portion 25b of the upper link stopper 25. The contact arm support 7 is rotated in the direction of bringing the movable contact 8 into contact with the fixed contact 4, and the contact arms 4 and 8 are in close contact with each other and the closed state is held.

When the trip device 22 detects an overcurrent or short circuit current from the ON state and then operates the latch 23, the latch 23 releases the catch of the front end portion 14a of the catch 14, as shown in FIG. It rotates rapidly counterclockwise about the catch side 17 integrally with the upper link 11 connected by the upper link 11.

In conjunction with this rotational movement, the manually operated handle 21 is rotated by the force of the casting spring 20 pulled between it and the pin 16 and moved to the trip position indicated by the dashed-dotted line in FIG. In response to the above operation, when the toggle link mechanism 10 bends rapidly under the force of the casting spring 20, the contact arm support 7 rotates at the speed in the direction to open the movable contact 8 from the fixed contact 4, and is opened instantly. .

In this way, when the movable contact 8 is opened by an automatic trip mechanism for instantaneous opening operation, the contact arm support 7 acts not only on the spring force of the cast spring 20 but also on the electromagnetic force caused by the large current during the circuit break. The contact arm support 7 rotates on the highway and collides with the lower end 14b of the catch 14, so the recoil moves away from the lower end 14b, ie, the movable contact 8 is thrown away from the open position and again jumps toward the fixed contact 4 again. . However, as shown in FIG. 4, in the trip state in which the tripping device 22 is operated so that the catch 14 rotates counterclockwise and contacts the catch stopper 24, the uplink 11 of the curved toggle mechanism 10 of the uplink stopper 25 The upper and lower links 11 and 12 of the toggle link mechanism 10 are operated in the direction of extending the bending, that is, in the direction of rotating the contact arm support 7 so that the movable contact 8 and the fixed contact 4 come close to each other since the contact with the stopper 25a occurs during a trip. It is prevented.

This prevents the contact arm support 7 from colliding against the catch bottom 14b and preventing its revolving motion, so that the contact arm 8 is not rotated again in the direction of bringing the movable contactor 8 close to the fixed contactor 4, so that the movable contactor 8 is in its open position immediately after the opening operation. It is held in the circuit board and ensures blocking of a large current.

Thus, according to this embodiment, immediately after the opening operation of the movable contact 8 at the time of tripping, the upper link stopper 25 for preventing the jumping movement of the contact arm support 7 with the movable contact 8 attached thereto is Catch 14 Since the fixed frame 18, which is formed in a shape, is rotatably geodesic in a state where both sidewalls are polymerized, the part of the fixed frame 18 can be formed in a simple shape exclusively for extrusion processing. Therefore, there is no need to increase the number of parts. Compared to the bending process, it can be easily manufactured at low cost, and it is easy to increase the degree and can not be deformed since it is not supported once, thereby improving reliability.

Moreover, according to this embodiment, compared with the conventional structure in which a catch is located in the center part of a fixed frame, The magnetic catch 14 has the advantage that the rotational movement is smooth and the catch shaft 17 can be formed integrally with the catch 14 by protruding the lower portion of the back of the backside on both sides, and a separate pin for axially supporting the fixed frame 18 is unnecessary.

In addition, according to the present embodiment, the upper link 11 stops the elongation of the toggle link mechanism 10 that is bent in contact with the stopper portion 25a at the time of tripping, thereby preventing the jumping motion of the contact arm support 7 as well as the normal operation of the closed state. In this case, the upper arm stopper 25 is generally formed so that the upper link 11 is brought into contact with the stopper portion 25b so that the upper link 11 and the lower link 12 are held in a substantially straight line. Therefore, the contact arm support 7 connected with the lower link 12 is movable contactor 8. The force is applied in the direction of contacting the fixed contactor 4, and the contact state between 4 and 8 is kept in close contact with each other to ensure the closed state.

As described above, according to the present invention, there is provided a stopper for preventing the bouncing motion immediately after the opening operation of the movable contactor at the time of tripping the main circuit at the same time. The catch formed in the shape of a magnetic shaft is axially supported in a state where both sidewalls are polymerized, and the number of parts is increased by integrally forming on both side walls of the fixed frame facing each other only by extrusion processing which is easy to increase the degree and has little deformation. Since it is simple and has a simple shape, it can be easily manufactured at a low manufacturing cost, and also has an excellent effect of providing a circuit breaker with high accuracy and improved reliability.

Claims (1)

The cross section holding the toggle link mechanism 10 and the toggle link mechanism 10 for converting the rotational motion of the handle 21 for opening and closing the circuit into linear motion is approximately A movable contact 8 attached to the contact arm support 7 rotated by a linear motion of the toggle frame mechanism 10 and the toggle link mechanism 10 formed in a shape of a child, and fixed to the movable contact 8. The contactor 4 and its cross section is approximately The tripping device 22 is polymerized and rotatably disposed inside the fixed frame 18 which is formed in a shape and rotatably coupled to the link 11 of the coggling link mechanism 10. In the circuit breaker having a stopping means 14b for releasing the locking state by the operation and regulating the rotational limit of the contact arm support 7 at the time of the movable contact 14 and the carry, the fixed frame ( 18. The two opposing side walls of 18) are extruded so that they are integrally formed and the catch 14 is released to contact the link 11 when the movable contact 8 is opened. A stopper portion 25a for regulating the recoil rotation of the link 11 afterwards and a stopper portion 25b for regulating the stop position of the link 11 when the movable contact 8 is in contact with the fixed contact 4. Cum Circuit breaker, characterized in that the equipment for the stopper 25 which.