JPS60202632A - Device for extinguishing wiring 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] [Technical Field of the Invention] The present invention relates to an arc extinguishing device for a circuit breaker. Completely equipped with an arc transfer guide running plate formed by extending the upper end of the U-shaped fixed contact base to which the contacts are fixed, and the extended end plates of the arc transfer guide running plate are arranged in tandem on the outside of the arc extinguishing grid. Furthermore, the arc transfer guide traveling plate is related to an arc extinguishing device arranged so as to obliquely traverse the Δ-shaped portion of the arc extinguishing grid arranged in tandem in a stepped manner.

(Technical background of the invention and its problems) As shown in FIG. 6, the arc extinguishing device of Danko 4 consists of a pair of arc running plates 31 and 32 arranged opposite to each other, and a pair of arc running plates 31 and 32 disposed between the arc running plates. It is composed of a plurality of arc extinguishing grids 33, and the arc generated between the contacts 34 and 35 at the time of opening is transferred to the arc traveling plate by the magnetic driving force obtained from one arc current, and is guided to the arc extinguishing grid to extinguish the arc. However, at the beginning of arc travel, the arc driving force due to the magnetic action of the grid is weak, so the speed of arc travel is slow, so it takes a long time until the arc is divided within the arc extinguishing grid block and the high arc voltage is fully generated. This resulted in problems such as the arc-extinguishing current limiting effect was reduced by half, and contact wear was also large.

[Purpose of the invention]

As shown in FIGS. 1 to 5, the present invention has an arc transfer guide traveling plate that is inclined across the △-shaped portion of the arc extinguishing grid to transfer the arc generated at the time of opening to the traveling plate. ! Due to the synergistic effect of the magnetic driving force obtained by the milk and the arc attraction force due to the magnetic action of the arc extinguishing grid, the arc is quickly transferred from the contact part to the arc extinguishing grid, reducing the wear amount of the contact, and improving current limiting performance. The purpose is to provide an arc extinguishing device with improved performance.

[Embodiments of the invention] An embodiment of the present invention is shown in FIGS. 1 to 5.

The present invention will be fully explained in detail based on the embodiments shown in the drawings.)
, 1.1 τ and a tripping element are arranged on the load side. According to the ON-OFF operation, Kuromenoku-4 moves up and down as shown by the arrows.

Reference numeral 5 designates a movable contact base whose base end 6 is supported by a support end 1 formed inside the insulator base l (which is always urged upward by a screw 8).

9 is a movable contact, 10 is an arc travel plate attached to the tip of the movable contact base, and 11 is a fixed contact, which is attached to the U-shaped bent end face 13 of the fixed contact base 12 and extended to make the cut thl into a △ shape. A travel plate 14 for arc transfer guide is formed and an extension end plate 15 is formed.
are placed outside the arc-extinguishing grid, which will be described later. Reference numeral 16 indicates a power supply side terminal fitting, and 1 indicates a power supply side terminal screw. Reference numeral 18 denotes a plurality of arc extinguishing grids, which are arranged in a stepwise manner in tandem, and the Δ-shaped portion 14' of the arc transfer guide traveling plate is the Δ-shaped portion 1 of the arc extinguishing grid.
They are arranged opposite to each other so as to cross the inside of 8' at an angle.

Reference numeral 19 denotes an extended end of the arc-extinguishing grid which is fitted into a groove 20 formed inside the insulator base φ. Reference numeral 21 denotes an insulating support plate which is fixed in columns from both sides of the forebrain arc-extinguishing grid.

22 is an actuation plate having one end fixed to the movable contact base and the other end fixed near the protruding end of the bimetal 23, and having a locking end 25 facing the free end of the bimetal 23; The free end 26 of the bimetal, which bends in response to an overcurrent θm or a short circuit current, drives the locking end 25 to release a tripping latch of the opening/closing mechanism (not shown).

Reference numeral 27 designates the load terminal plate completely fixed to the bimetal, 28 designates a load terminal metal fitting, and 29 designates a load terminal screw.

Furthermore, FIG. 4 shows another embodiment of the structure in which the arc transfer guide end face of the arc transfer guide traveling plate 30 is punched by Ai press to form a curved shape and is bent into an L shape.

The present invention is constructed as described above, and its functions and effects will now be described in detail.

In FIGS. 1 to 5, when a short circuit accident occurs with the handle 3 in the ON state, the bimetal 23 is rapidly heated due to the short circuit overcurrent and bends, and the free end 26 is locked to the latch plate 24. The end 25 is pressed and driven to release a tripping latch of the opening/closing mechanism (not shown).

Due to the tripping of this engagement, the opening/closing mechanism is interlocked and the crossbar 4 is rapidly driven upward as shown in the figure, and the movable contact block 5 is biased by the spring 8 to operate upward and move from the fixed contact 11. The contact 9 is opened and opened.

The arc that occurs between both contacts when the contact is opened is this arc′
The electromagnetic driving force obtained by the flow moves the fixed contact □11 to the base end of the arc transfer guide traveling plate 14 formed in a shim shape. Therefore, since the arc-extinguishing grids 18 are tilted toward the upper left in the figure at approximately equal distances and are arranged to cross the Δ-shaped portions 1B' of the arc-extinguishing grids 18 arranged vertically in a stepwise manner, the initial arcs that have migrated to the base end are as follows. Due to the action of the arc-extinguishing grid arranged in a stepwise manner, the arc is elongated very quickly, and is elongated between the extended end plates 15 while fully discharging the arc travel plate 10 and the arc transfer guide travel plate 14h. The arc is transferred to a plurality of arc extinguishing grids, dividing the arc, increasing the arc voltage, enhancing the current limiting effect, and acting to completely prevent contact wear and cutting off the arc current very smoothly. It is something.

Furthermore, in another embodiment shown in FIG. 4, the arc transfer guide traveling plate 30 is curved into an L shape, and the arc transfer guide end surface A has a curved plate thickness end surface so that the arc transfer travel is extremely easy. As described above, the formed structure allows the initial arc to reach full extension very quickly.

As described above, the present invention provides an arc transfer guide formed by extending a plurality of arc extinguishing grids arranged vertically in a stepwise manner to divide and extinguish an arc, and an upper end of a U-shaped fixed contact base to which fixed contacts are fixed. a running plate, the extended end plates of the arc transfer guide running plate are arranged in a column on the outside of the arc extinguishing grid, and the arc transfer guide running plate is connected to the arc extinguishing grid arranged in a stepwise manner. Since the arc extinguishing device is arranged across the slanted inner metal of the △-shaped part, the synergistic action of the response arc suction force in the event of a short circuit causes the arc to be elongated and transferred from the contact part very quickly, preventing wear of the contact or deterioration of the insulation around the contact. 1. In addition, the arc can be quickly transferred to the arc extinguishing grid to completely divide the arc, increasing the arc voltage and enhancing the current limiting effect, shortening the total cut-off time and stabilizing the short circuit performance. can be done, and it is extremely effective.

[Brief explanation of drawings]

Fig. 1 is a cutaway sectional view of one embodiment of the present invention, Fig. 2 is a sectional view of the main part of the invention, Fig. 3 is a perspective view of the main part, and Fig. 4 is a main part of another embodiment of the invention. FIG. 5 is a plan assembly view of the arc-extinguishing grid, and FIG. 6 is a sectional view of a main part of a conventional embodiment. l...Insulator stand 5...Movable contact stand 2...
Insulation cover 6...Base end of movable contact plate 3...Handle 1...Support end

Claims (3)

[Claims] (1) A plurality of arc extinguishing grids arranged in a stepwise manner to divide and extinguish the arc, and an arc transfer guide traveling plate formed by extending the upper end of the U-shaped fixed contact base to which the fixed contacts are fixed. The traveling plate for arc transfer guide has a △-shaped cross section, and the arc extinguishing grid arranged in columns in a stepwise manner has a △-shaped cross section.
An arc extinguishing device for a wiring circuit breaker characterized by the fact that the △-shaped part is slanted across the inside of the △-shaped part in opposition to the shaped part. (2) The arc extinguishing device according to claim 1, characterized in that the lower end of the arc extinguishing grid arranged in a column is fitted into a groove formed inside the insulator stand. . (3) The traveling plate for the arc transfer guide has a t-L cross section, and the arc transfer end surface A is curved! ! l-The arc extinguishing device according to claim 1 or 2, characterized in that: