JPS60232628A - Breaker - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit breaker with improved breaking characteristics.

Conventionally, a circuit breaker is equipped with an arc extinguishing device in which a large number of arc extinguishing plates are arranged at constant meter intervals in the contact opening direction, but in this case, when the arc moves to the arc extinguishing plates, Although the arc is extinguished by the deionization effect such as movement of the arc to the arc extinguishing plate exhaust side due to electromagnetic repulsion, the arc occurs when the contacts open and the attraction force of the 1C arc to the arc extinguishing plate is relatively weak, so the arc continues. There was a drawback that the arc could not be immediately transferred to the arc extinguishing plate, and as a result, the contact surface was damaged before the arc transferred from the contact to the arc extinguishing plate.

The purpose of the present invention is to immediately transfer the arc generated when the contact opens from the contact via an arc travel plate to a plurality of arc extinguishing plates bent into a U-shape, thereby preventing damage to the contact surface due to the arc. It is an object of the present invention to provide a circuit breaker in which the arc transferred to the arc extinguishing plate is extinguished while transferring from the arcing side to the exhaust side of the arc extinguishing plate, thereby improving the interrupting characteristics.

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings.

The fixed conductor 2
In a circuit breaker 6 that presses and separates a fixed contact 3 fixed to a movable conductor 4 and a movable contact 5 fixed to a movable conductor 4, a fixed contact 3 and a movable contact 5 fixed to a movable conductor 4 are connected to each other at the position of the fixed contact 3 of the fixed conductor 2. The arc generated between the fixed contact 3 and the movable contact 5 is scraped from the fixed contact 3 toward the movable conductor 4 by changes in the magnetic field after the arc occurs and by the flow of air with the pressure of the arc. A metal arc running plate 7 is bent obliquely in the direction of opening of the movable contact 5 and attached, and the fixed conductor 2 is attached to the 4 =
A fixed contact 3 is installed inside the terminal 8 for external wiring.
and a U-shaped partition wall 9 made of heat-resistant insulating material surrounding the arc running plate 7.
is attached to serve as a contact plate for the external wiring wire inserted into the square terminal 8, and a hole 11 is formed in the contact plate surface 10 of the partition wall 9 to promote gas handling of the arc and improve the cooling effect. In addition, between the side surfaces of the partition wall 9, there are a plurality of metal arc extinguishing plates 12 bent into a substantially U-shape, with the bent portions on the arcing side and both ends on the exhaust side. The arc extinguishing plate 12 is attached approximately parallel to the arc traveling plate 7 at an arbitrary interval, in this embodiment, at a constant interval, and a U-shaped notch 13 is formed on the arc firing side of the arc extinguishing plate 12.

Next, the operation of this embodiment will be explained.

In this circuit breaker 6, in which an arc extinguishing device 14 consisting of an arc running plate 7 and an arc extinguishing plate 12 is attached to the contact portion, the movable contact 5 separates from the fixed contact 3 when the load current is applied. When turned off, an almost linear arc A1 is generated between both contacts 3.5, and the magnetic field changes due to the influence of the adjacent arc running plate 7, that is, the arc A1 is generated between the movable contact 5 and the arc running plate 7. As the potential gradient of
1, the arc A1 immediately moves from the fixed contact 5 to the arc travel plate 7.

The arc A2 transferred to the arc running plate 7 in this way is further moved by the magnetic action of the notch 13 as well as the repulsive force F generated between the arc A2 and the current flowing through the arc running plate 7. The arc A3 transferred to the plurality of arc extinguishing plates 12 and the arc extinguishing plate 12, that is, the arc running plate 7 and the arc extinguishing plate 12, the arc extinguishing plate 12 and the arc extinguishing plate 12,
Arc extinguishing plate 12 points possible lvIg11 rest 4 tips 1iil '7)
7') A 3 Get, as shown by the arrows in FIG. The repulsive force 1: generated between the arc and the current flowing through the arc extinguishing plate 12 causes the arc to advance toward the exhaust side of the arc extinguishing plate 12, and as a result of the series of movements of this arc, the arc (in addition to receiving a cooling effect), the arc current Due to the deionization effect caused by the flow from one end of the side to the other end, the arc voltage increases, the arc current decreases, and the arc is extinguished at the current zero point.

Note that the arc traveling plate 7 is connected to the fixed conductor 2 as shown in FIG.
The arc running plate 7' can be made by punching out the arc running plate 7', and in the case of the opening, since the width of the arc running plate 7' is narrow, the electric potential gradient of the arc running plate 7'' is made higher to make the transition of the arc easier. It is possible to make money, 4-.

Next, the effects of the present invention will be explained.

The present invention reduces damage to the contact surface caused by the arc by immediately transferring the arc generated when the contact opens from the contact via an arc traveling plate to a plurality of arc extinguishing plates bent into a substantially U-shape. In addition, by making the arc transferred to the arc extinguishing plate move from the arc generation side to the exhaust side of the arc extinguishing plate, the structure is simplified and the arc extinguishing ability can be easily increased.

[Brief explanation of the drawing]

Fig. 1 is a partially broken pressure surface view of a circuit breaker 6 according to an embodiment of the heather invention, Fig. 2 is a partially broken side view, Fig. 3 is an enlarged plan view of the main part, and Fig. 4 is a A perspective view of the arc-extinguishing plate 12, FIG. 5 is an explanatory view of its operation, and FIGS. 6 and 7 are perspective views of other embodiments of the present invention. 2... Fixed conductor 3... Fixed contact 4... Movable conductor 5... Movable contact 6... Circuit breaker 7.7'... Arc traveling plate 12... Arc extinguishing plate AI , A2. A3... Ryoichi Applicant Kawamura Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 3 Figure 9 Figure 4 Figure 5 Figure 6 Procedures Amendment (10,000 types) Otsu Showa S9 Date Patent Director-General of the Office, 1. Indication of the case 1982 patent application 1r7. ! ;62
No. 2 Title of the invention Interrupter 3 Relationship with the case of the person making the amendment Patent applicant July 31, 1960 A brief explanation of the drawings of the specification subject to the amendment! +ti B Contents of the amendment In the detailed statement, "Figure 5 and Figure 7" written on page 6, line 74 (line 7.5' to line 7.5') will be amended to "Figure 6."

Claims (1)

[Scope of Claims] Attached integrally to the movable conductor at a position opposite to the fixed contact attached integrally to the fixed width body [Attachment so that the pulled movable contact can be brought into contact with and separated from the fixed contact. , and, integrated with the fixed contact, an arc traveling plate for moving an arc generated between the fixed contact and the movable contact from the fixed contact to the tip of the movable conductor by a change in the magnetic field after the arc is generated. A plurality of metal arc-extinguishing plates are attached by bending them diagonally in the direction of release of the movable contact, and then bending them into a substantially U-shape, with the bent portion facing the arcing side, and both ends thereof. 1. A circuit breaker, characterized in that the part is on the exhaust side and the circuit breaker is arranged substantially parallel to the arc traveling plate at an arbitrary interval.