JPS63108622A - Switch - 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 [Industrial Field of Application] The present invention relates to a switch that switches on and off current, and particularly to an arc extinguishing mechanism thereof.

Examples of this type of switch include electromagnetic contactors and indoor circuit breakers.

[Conventional technology]

Switches used in electric circuits are used in various fields and come in many types, one example of which is shown in FIG.

This is a partial cross-sectional view of a switch shown in, for example, Japanese Patent Application No. 58-225372, and FIG. 15 is a cross-sectional view of a main part of the switch shown in FIG. 14 to explain the arc extinguishing operation. It is.

In this Figure 14, (1) is a mounting base made of plastic, (2) is a fixed core laminated with silicon steel plates on this mounting base, and (3) is a fixed core (ζ) installed opposite to the fixed core (2). Similarly to this, K-T: movable iron core laminated with steel plates,
(4) is an operating coil that provides a driving force to attract the movable core (3) and the fixed core (2) against a tripping spring (not shown); (5) is made of plastic; It is a crossbar with a corner window, and + and f are possible at its lower end! Ii!
It holds the I iron core (3).

(6) is a movable contact pushed into the corner window of the crossper (5) and held by a push spring (7);
) is a movable contact provided on the movable contact (6), (8) is a fixed contact that is provided opposite the movable contact (6) and conducts current, (August is this fixed contact The fixed contact provided in (8), (8B) is also this fixed contact (
8) shows the terminal section.

In addition, (9) is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, (II is a base for attaching the fixed contact (8), αυ is a cover that covers the top surface of the electromagnetic contactor,
Inside thereof, a magnetic metal arc extinguishing plate 0 floor is provided to extinguish the arc (2) generated between the fixed contact (8A) and the movable contact (6 persons).

As is clear from FIG. 14, the metal arc-extinguishing plates Q31 are cumulatively arranged side by side, facing the movable contact (6), above and parallel to the fixed contact (8), and spaced apart from each other by a predetermined distance. has been done.

Note that a9 is a commutation plate provided above the movable contactor (6).

Since it has the above configuration, when the operation coil (4) is demagnetized in this RI magnetic contactor, the movable core (3) is separated from the fixed core (2) by a tripping spring (not shown).

Therefore, the cross spar (5) is also in the state shown in FIG. 14, and the fixed contact (8A) and the movable contact (6A) are separated and an arc surface is created between them.

On this arc side, as shown in Fig. 15, the metal arc extinguishing plate Q3
1, it is stretched as shown as arc (12A), and it sequentially passes through the state of arc (12B), and the leg of arc (12B) transfers to the commutation plate side, becoming arc (12C). Thereafter, the metal arc-extinguishing plate side cools the arc and extinguishes it.

[Problem to be Solved by the Invention 1] In the conventional switch configured and operated as described above, the arced gas generated when the switch is shut off is discharged directly to the outside, so the switch and its cylinder,
Another disadvantage is that a large arc space must be provided between the switchboard and the door of the switchboard that houses this switch, and from the point of view of arc 0 operation, the arc surface generated when the switch is cut off is under the pressure of the arced gas. The metal arc-extinguishing plates (131) are often driven to the ends of the metal arc-extinguishing plates (131), and as shown in FIG. Inconveniences were often observed in that this stalemate caused damage to contacts, contactors, commutation plates, and metal arc-extinguishing plates.

This invention was made to solve the above-mentioned problems, and by regulating the release of arced gas, it prevents the arc from sticking and stabilizes the performance originally expected of the switch for a long time. The purpose of this is a switch that can be operated and maintained.

[Means for solving problems]

The switch according to the present invention avoids the above-mentioned inconvenience by disposing an insulating plate-like material at the end of each metal arc-extinguishing plate.

[For production]

The switch in this invention regulates the external release of arced gas directly between the metal arc-extinguishing plates by just making a slight modification such as placing an insulating plate on the outside of the metal arc-extinguishing plates, As a result, the traveling of the arc is not accelerated, and the arc is extinguished before it reaches the end of the metal arc-extinguishing plate9, thereby improving the breaking performance of the switch.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. Since this embodiment is similar to the conventional switch shown in FIG. 14, the explanation will focus on the differences. do.

1 is a sectional view of a main part for explaining the arc extinguishing operation of an embodiment of a switch formed according to the present invention.

In this case, at the end of the metal arc-extinguishing plate (131), an insulating plate 1e as shown in FIG. Different from the vessel.

In the switch configured as described above, when the movable contacts (6 contacts) are separated from the fixed contacts (8 contacts), an arc 0z is generated as shown in FIG. 1 during that time.

A magnetic flux is generated around this arc θ2, which is attracted to the magnetic metal arc-extinguishing plate Q31 and deforms into an arc (12^), and the upper leg of the arc (12A) is attached to the movable contact (6). ) and its lower leg leaves the fixed contacts (8) and travels on the fixed contacts (8) to form an arc (12B).

This arc (12B) is further driven to the 0th floor of the metal arc extinguishing plate, its upper leg extends upward, bends and moves to the lower part of the commutation plate, and then travels further outward. 12C) Eventually, it becomes an arc (12D) and is extinguished.

By the way, if the insulating plate (191) is placed close to the end of the metal arc extinguishing plate Q31 at this time, the exhaust flow path of the arced gas generated due to the generation of the arc will be restricted as shown by the white arrow. Therefore, under the influence of this, Ark (120
) is cooled and disappears before it reaches the end of the metal arc-extinguishing plate α3.

The embodiment shown in FIG. 3 is a modified example of FIG. By adopting such a configuration, it is possible to further suppress the progress of the arced gas to the outside, and this makes it possible to further reduce the traveling speed of the arc Oz while cooling and extinguishing it.

The above-mentioned effects can be obtained not only when the above-mentioned form is adopted (although, as a modification thereof, it can also be used in an apparatus having a structure as shown in FIG. 4).

That is, in the structure shown in FIG. 1 or 3, the lowermost metal arc-extinguishing plate (13g) of the metal arc-extinguishing plate Q31 is lengthened, and the part that covers the fixed contact is changed to the structure shown in FIG. The difference is that it was done like this.

By adopting such a shape, a magnetic flux φ shown in Fig. 5 is generated around the arc 0 of B, and the arc az receives a force in the direction shown by the arrow F. The plate (13g) has legs (13g) as shown in Figure 5.
ga), the force F acts more strongly, making it easier for the arc side to expand, and increasing the rate of increase in the initial arc voltage.

That is, in the device in this case, the rate of increase in arc resistance becomes faster, so that the current limiting performance is improved.

From this, the arc side between the contacts becomes an arc (12A) in a short time as explained in Fig. 1,
This (13g) is absorbed by the metal arc-extinguishing plate outside the breath, causing an arc (12B) and an arc (12C).
The arc progresses through these states, and finally becomes an arc (120), where it is cooled and extinguished by the metal arc-extinguishing plate.

In this way, the arc is driven immediately after the arc occurs and the transition from the arc (12C1 state to the arc (12D) state) is performed well, so the time required for interruption is shortened.
Moreover, as mentioned above, the current limiting performance is also improved, so the arc energy at the time of interruption is reduced, and it becomes possible to interrupt a larger current.

In addition, in the embodiment shown in FIG. 4, an example was shown in which the arc horn (6B) was joined to the tip of the movable contactor (6A).
The movable contacts (six) and the arc horn (6B) may be integrated.

Also, it goes without saying that the insulating plate shown in FIG. 4 may be brought into contact with the metal arc-extinguishing plate α31 and configured as shown in FIG. 6. The same added effect as in FIG. 3 can be expected.

In addition, in the cases shown in Figs. 4 and 6, the fixed contact (
Although only the metal arc-extinguishing plate (13g) closest to 8) was extended to the top of the fixed contact (8), a similar structure may be given to other metal arc-extinguishing plates (131), and Alternatively, the shape may be such that the arc horn (6B) is missing.

As another example, the fixed contact (8) is configured such that the arc runner side is set as shown in FIG.
) is used.

In the embodiment shown in FIG. 7, the arc runner side bent in an inverted shape is electrically connected to the end of the fixed contact (8) side of the fixed contact (8). Further, the bent portion on the arc runner side is formed so that the movable contact (6) can pass through an important portion and come into contact with the fixed contact (8A).

When using such a fixed contact (8), if the insulating plate side is placed at an appropriate distance from the metal arc extinguishing plate α stage as in the previous case (Fig. 8), and the metal arc extinguishing plate 2 of the case (Fig. 9) when the insulating plate (141) is brought into contact with the plate θ3)
Although two configurations are possible, the arc extinguishing mechanism of this device will be explained using the example shown in FIG. 8 as a representative example.

That is, first, move the movable contact (6A) to the fixed contact (8 people).
When the arc runner is removed from the arc runner Q
41 is provided at a higher position than the surface of the fixed contact (8), the lower leg of the arc surface on the fixed contact (8A) easily transfers to the arc runner circle and the arc (12 people)
Like (Konaru)

When the lower leg of the arc Oz transfers to the arc runner side, a current flows through the arc runner Q4) in the direction of the open end of the arc runner α4 in FIG.
) should be driven further toward the terminal part (8B) of the fixed contact.

The arc (12A) connects its upper leg to the movable contact (6A)
The metal arc-extinguishing plate Q31 transfers to the tip of the movable contact (6) and is drawn into the metal arc-extinguishing plate Q31. It runs on Arc Runner Q41 via .

Next, the arc (12B) transferred to the movable contact (6)
The upper leg is driven by the metal arc extinguishing plate <131, and is also driven upward by the magnetic field created by the current flowing on the arc runner side, and is driven from the fixed contact (6) to the bent part of the commutation plate (G). (If there is an arc horn (6B), it travels above the arc horn (6B) via the arc horn (6B) and reaches the upper end of the arc horn (6B)), and finally, Arc (12D) passing through all arc extinguishing plates (13a to 13-) of metal arc extinguishing plate α (to)
The upper leg runs outward (to the right in the figure) to the commutation plate and connects the arc (12) to the arc runner circle.
0) and the arc is extinguished.

In this manner, by providing the arc runner α4, it is possible to further speed up the driving of the arc, and therefore, it is possible to further improve both the current limiting performance and the interrupting performance.

Further, another embodiment will be explained with reference to FIG. 10 (and FIG. 11). In this embodiment, an arc horn (6B) is applied to a switch having a U-shaped fixed contact (8). This shows an example, and the generated arc az is
Because it is not only attracted to the magnetic metal arc-extinguishing plate but also driven by the magnetic field created by the current flowing through the fixed contact (8) (arrow X in Figure 10), the lower leg on the arc side is connected to the fixed contact. (8A) can be easily transferred to the fixed contact (8), thus reducing wear and tear on the fixed contact (8), and since the arc surface is strongly driven, the arc time is shortened and the breaking performance is improved. will be further improved.

Furthermore, Fig. 12 (and Fig. 13) shows the case where the present invention is applied to a molded circuit breaker. The movable contactor (6) and the commutator plate are electrically connected via the line O.

It goes without saying that even in this case, the same effects as those of the above embodiments can be achieved.

In addition, in these figures, the arc runner Q41 is (
However, it is clear that the effects of this invention can be enjoyed.

The embodiments described above are described assuming that the present invention is applied to an electromagnetic contactor or a molded circuit breaker, but the present invention can also be applied to an electromagnetic circuit breaker such as an air circuit breaker. It goes without saying that you can do it.

〔Effect of the invention〕

As described above, according to the present invention, the metal arc-extinguishing plate has an insulating plate arranged at the end and constitutes a switch to regulate the release of arced gas, so that the gas pressure does not reach the arc. Therefore, the arc does not become unstable and can be extinguished along a predetermined path, so that the I/O to the insulating material forming the outer wall
It is possible to improve both interrupting performance and current limiting performance without causing rA damage.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts for explaining the arc-extinguishing operation of the switch according to the present invention, and FIG. 2 is a perspective view of the insulating plate used in the present invention.
3.4 and 6 are cross-sectional views showing the explanation of the arc extinguishing operation of the open/close type according to other embodiments, FIG. 5 is a plan view showing the relationship between the metal arc extinguishing plate and the fixed contact, and FIG. 7 1 is a perspective view of a partially improved fixed contact, FIGS. 8 to 13 are sectional views according to still other embodiments of the present invention, FIG. 14 is a partial sectional view of a prior art switch, and FIG. FIG. 2 is a sectional view of a main part of a prior art switch for explaining an arc-extinguishing operation. (6)...Movable contact, (6A)...Movable contact, (6
B)...Arc horn, (8)...Fixed contact, (8
A)・Fixed contact, αJ・Metal arc extinguishing plate, (13m) ~(
13f) - Arc-extinguishing plate, (13ra) - Arc-extinguishing plate leg, circle
Arc runner, stranded wire, insulation board. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A fixed contact joined to a fixed contact; a movable contact facing the fixed contact and joined to a movable contact; In a switch equipped with a plurality of metal arc-extinguishing plates cumulatively installed on the tip side and a commutation plate above the movable contact, an insulating plate-like object is arranged at the end of each metal arc-extinguishing plate. A switch characterized by: (2) The switch according to claim 1, wherein the insulating plate-like material is arranged with a slight gap from the end of the metal arc-extinguishing plate. (3) The switch according to claim 1, wherein the insulating plate-like material is disposed in contact with an end portion of the metal arc-extinguishing plate.