KR830000510Y1 - Low voltage circuit breaker - Google Patents

Abstract

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Description

Low voltage circuit breaker

1 is a longitudinal sectional view of a compact low voltage circuit breaker according to the present invention configured as a weekly switch.

2, 3, and 4 are longitudinal sectional views, front views, and plan views of the operation lever in the circuit breaker shown in FIG.

5 is a side view of part of another example of the operation lever according to the present invention.

The present invention provides a movable contact and a pedestal of the articulated link mechanism, which are closed by a tension spring and articulated link mechanism by an insulated case, an operation lever and a handle disposed in the insulated case and fixedly supported at a predetermined position. It relates to a low voltage circuit breaker having a main link which is used as a free side and is freed by a tripping side for opening and closing.

Conventional circuit breakers are known, for example, by US Pat. No. 3,758,887. If such a circuit breaker is used, for example, as a day switch, the contactor is marked with the handle of the circuit breaker when the contactor is in the "dog" position, and the handle is in the "dog" position, for example with a lock, if necessary. You must be able to lock it. However, in the conventional circuit breaker of the above-described aspect, the handle may sometimes display the "open" position even when the contactor stays in the "closed" position for some reason. Thus, when the contactor is actually closed and the handle is in the "open" position indication, the operator may make a mistake that the load controlled by the circuit breaker, for example, the machine tool is in a voltageless state.

Therefore, the object of the present invention is that, in the low voltage circuit breaker of the above-described type, the handle is opened in the "open" position when the operating contactor and the handle in which the operating lever is in the "closed" position by mistake are in the "closed" position. In shaping so that it can't.

The object of the present invention is to provide a low-voltage circuit breaker according to the present invention, in which the operating lever cooperates with the working surface in which the operating lever is accidentally staying in the "closed" position in the "closed" position. , Is achieved by the tripping. Therefore, having a tripping lever cooperating with an axis can be distinguished from the conventional circuit breaker according to whether or not there is an operating lever constructed by the present invention.

Within the scope of the present invention, the operating lever is formed to have two arm portions each having a different length, the long arm portion supports the handle, and the short arm portion is provided with a working surface cooperating with the movable contact. In this case, it is recommended to use a connection pin connecting one of the articulated link mechanisms and the movable contactor as a contact surface or an opposing surface of the operating lever. The cooperative action of the movable contactor and the working surface is easily achieved by properly allocating the long arm portion and the short arm portion of the operation lever.

The tripping lever is preferably formed as a tripping arm which is refractedly coupled to the long arm portion of the operating lever and is pivotable with respect to the spring, and a projection is formed on the tripping side opposite to the tripping arm. When the breaker performs its normal function, the tripping lever acts for the release of the main link before the operating surface of the operating lever collides with the movable contactor or the connecting pin mounted on the movable contactor. Therefore, the connecting pin acts as an opposing surface when the movable contactor is no longer moved in the "closed" position by, for example, welding of the contact surface. Again "closing" of the circuit breaker is possible without the influence of the tripping axis by means of a spring attached to the tripping arm (tripping lever). By appropriately selecting the shape of the operating surface of the operating lever, various operation methods can be obtained according to the request. If the contour of the working surface is selected such that the force exerted only in the radial direction also with respect to the position of the movable contact when the contactor does not try to move in the "closed" position, the handle remains in the "closed" position. On the other hand, if the working surface is formed at an angle, the operating lever can exert a component of the force acting in the direction away from the fixed contact to the movable contact which remains in the "closed" position after failure. In this way, the movable contactor can have a larger or smaller separation force from the stationary contactor, depending on the size, shape, position, and state of the force transmission of each part.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The low voltage circuit breaker 1 shown in FIG. 1 is a so-called compact circuit breaker having an insulating case 3 divided into an upper case 5 and a lower case 4 with the junction surface 2 as a boundary. The circuit breaker 1 is configured of a three-pole type here, and FIG. 1 shows a longitudinal cross section of the central pole in which the opening and closing mechanism is housed. The paths through which current flows are the same for all three poles, and the external connection of the other through the heater 7, the flexible conductor 10, the movable contact 11 and the fixed contact 12 is performed at one external connection terminal 6. Follow the path to the terminal 13. The distal end portion of the movable contact 11 is located in the extinguishing chamber 15 which is composed of a plurality of extinguishing plates 14.

In the opening and closing operation of the circuit breaker, a handle 16 protruding from the opening 17 installed in the upper case 5 is used. The handle 16 is mounted on the operating lever 20 which is pivotally placed between the supporting plates described below. In Fig. 1 one of the supporting plates is specified, here denoted by the reference sign 21. A tension spring 25 is attached between the connecting pin 22 of the expansion link 23 and 24 and the upper end of the operating lever 20. As shown in FIG. 1, when the circuit breaker 1 is closed, the expansion links 23 and 24 are in the open state, and thus the movable contactor 26 is required by a contact pressure spring (not shown). The contact pressure can be applied to the movable contact 11.

At this time, the connecting pin 27 is formed to bond the deflection link 24 and the movable contact 11 bend. The insulated opening / closing side 30 connects the movable contactor support in each pole of the circuit breaker 1 with each other.

In the illustrated "closed" position, the upper flexing link 23 is pivotally supported around the pin 31 and is supported by the ratchet 32 hanging on the ratchet support 33 at the illustrated position. Supported. The ratchet support 33 is pivotally placed in the support hole 34, and is biased in the direction of releasing the latch of the ratchet support 33 by the tension spring 35. When the tripping shaft 36 is rotated clockwise by the action of the bimetal plate 37 or the tripping contact 40, the ratchet support 33 is moved from the main ratchet 32 by the force of the tension spring 35. As a result, the main ratchet 32 pivots around the pin 31, which is its pivot shaft, and the point of the expansion link 23 moves in the direction in which the movable contact 11 falls from the fixed contact 12. .

However, in the conventional circuit breaker, the result as described above is obtained by the handle 16 moving.

That is, by moving the handle 16, the direction of action of the tension spring 25 is changed around the connecting pin 22, and the bending links 23, 24 are to be refracted. In the case of the circuit breaker according to the present invention, the tripping shaft 36 is rotated similarly to the above-described automatic trip by the tripping lever 41 mounted on the operation lever 20.

In order to do this, the tripping lever 41 acts like the ridge-shaped protrusion 42 of the tripping shaft 36.

When the movable contactor 11 does not move in the "closed" position shown in the figure for some reason (for example, by fusion with the fixed contactor 12), the handle 16 is in the "open" position direction. You can only move very little.

This is because the working surface 43 faces the connecting pin 27. When the circuit breaker is normal, the connecting pins 27 are outside the operating range of the working surface 43 while the handle 16 is moving because the movable contact 11 is already moved to the "open" position. .

Details of the operation lever and the working surface will be described next with reference to FIGS. 2 to 5.

The operation lever 20 has a substantially u-shaped bow, and attachment protrusions 46 and 47 are formed on the legs 44 and 45 for attachment of the circuit breaker 1 to the support plate. have. By this projection, the operation lever 20 is divided into the upper arm part 48 of the upper part and the arm part 49 of the lower part. In order to suspend two tension springs (one of which tension springs 25 are clearly shown in FIG. 1), holes 51 and 52 in the central plate 50 of the operating lever 20 are attached. Is formed. Lower ends of the leg portions 44 and 45 are formed as the above-described working surfaces, respectively. In FIG. 1 only one of these working surfaces 45 is shown. The shape of these working surfaces is selected so that only the radial force is applied to the connecting pin 27 in consideration of the arrangement of the attachment protrusions 46 and 47 and the position of the opening / closing side 30. However, as shown in FIG. 5, when the shape of the working surface 53 is selected to be inclined in a wedge shape, when the two contacts are in contact with each other, the movable contact 11 is connected to the connecting pin 27. Is exerted a force acting on the direction away from the fixed contact 12. The angle of the working surface 53 shown in FIG. 5 is only an example, and can have a magnitude | size according to the magnitude | size of the open and falling force required. Similarly, the position of the attachment projections 46 and 47, that is, the relationship between the arm portion 48 and the arm portion 49 of the drive lever 20 can also be opened and changed in various ways depending on the magnitude of the falling force.

The tripping lever 41 configured as a lever having three arms is pivotally supported by the support shaft 54 attached to the leg 44 of the operating lever 20. One side of the tripping lever 41 is provided. The arm 55 acts as a striking member, while the other arm 56 acts together with the ridge-shaped projection 42 of the tripping 36 shown in FIG.

The arm 55 abuts against the leg 44 of the operating lever 20 by the action of the torsion spring 57. When closed again, the spring 57 allows the arm 56 to act on the protrusion 42 of the opening and closing shaft 36.

As is apparent from the above description, the present invention does not require a large cost, and it is possible to change the ordinary circuit breaker into a weekly switch which can protect from being severely closed in the "open" position.

Claims (1)

At least one movable contactor which is opened and closed via a tension spring and a deflection link mechanism by an insulated case, an operating lever and a handle disposed in the insulated case and fixedly supported at a predetermined position, and used as a pedestal for the deflection link mechanism. In addition, in a low voltage circuit breaker having a main link freed by a tripping shaft for disconnection, the movable contact 11 and the handle 16 in which the operation lever 20 stays in the "closed" position are well closed. And a working surface (43) for cooperating in a direction constrained to and a tripping lever (41) for cooperating with said tripping shaft (36).