JPS63915A - Switch - 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 [Field of Industrial Application] The present invention relates to a switch that switches on and off current, and particularly to its extinction mechanism.

[Conventional technology]

Switches used in electrical circuits are used in various fields, and one example is the one shown in Figure 9. It is a partial cross-sectional view of the switch.

In this Figure 9, (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 installed opposite to fixed core (2). A movable core laminated with silicon steel plates, (4)
(5) is an operating coil that provides a driving force to attract the movable core (3) and fixed core (2) against a tripping spring (not shown); (5) is a cross made of plastic and having a square window; A bar, at its lower end, holds a movable iron core (3).

(6) A movable contact inserted into the corner window of the crossbar (5) and held by a push spring (7), (6 pieces are movable contacts provided on the movable contact (6), 6B)I
an arc horn provided at the tip of the movable contact (6);
(8) is a fixed contact provided opposite to the movable contact (6) and conducts current, (8A) is a fixed contact provided on this fixed contact (8), and (8B) is the same. The terminal portion of this fixed contactor (8) is shown.

Note that the arc horn (6B) may be integrated with the movable contact (6).

Mana (9) is a terminal screw for connecting the main body of the Ti magnetic contactor with an external circuit. Inside, a magnetic metal arc-extinguishing plate Q31 is provided to extinguish the arc generated between the fixed contacts (8 contacts) and the movable contacts (6 contacts).

As is clear from FIG. 10, the metal arc-extinguishing plates α3) are stacked facing the movable contact (6), above and parallel to the fixed contact (8), and at a predetermined interval from each other. Although they are arranged side by side, their individual shapes are as shown in Figure 11.

In addition, the switch is a commutation plate provided above the movable contactor (6).

With the above configuration, when the operating coil (4) is demagnetized in this electromagnetic contact, the movable core (3) is separated from the fixed core (2) by a tripping spring (not shown).

Therefore, the crossbar (5) is also in the state shown in FIG. 10, and the fixed contacts (8 contacts) and the movable contacts (6 contacts) are opened and arcing occurs between them.

This arc (self) is attracted to the metal arc-extinguishing plate tm as shown in FIG.
Through state 2C), the foot of the arc (12c) on the arc horn (6B) is transferred to the commutation plate 1, and the arc side finally becomes an arc (12D), and the metal arc extinguishing plate side The process is that the arc is cooled down and the arc is extinguished.

[Problems that the invention attempts to resolve]

In the conventional switch constructed and operated as described above, the plurality of magnetic metal arc-extinguishing plates α3) are simply arranged in parallel, so that the arc is emitted to the outside with a short arc length. Accidents such as ground faults and external short circuits were often observed.

[Means for solving problems]

The present invention aims to eliminate the above-mentioned problems and to obtain a switch with excellent current-limiting performance and breaking performance. , a movable contact facing the fixed contact and connected to the movable contact; a metal arc-extinguishing plate parallel to the fixed contact and spaced apart from each other by a predetermined distance; and a plurality of metal arc-extinguishing plates cumulatively installed on the tip side of the movable contact; In the switch equipped with a commutation plate above the movable contact, a fixed contact joined to the fixed contact, a movable contact opposite the fixed contact of B and joined to the movable contact, and a fixed contact connected to the fixed contact. parallel to each other and spaced apart from each other by a predetermined distance, and on the tip end side of the movable contact. In a switch equipped with several metal arc-extinguishing plates and a commutation plate above the movable contact, at least the vicinity of the ends of the commutator plate and the metal arc-extinguishing plate are spread radially. This article relates to a characteristic switch.

[For production]

In the switch according to the present invention, the vicinity of the end of the metal arc-extinguishing plate is made radial, which has the effect of stretching the arc length by the inclination of the metal arc-extinguishing plate and the commutation plate. Opportunities for contact increase, the cooling effect becomes extremely large, the rise of the arc voltage increases, it becomes possible to diffuse the arc blowout, and it is possible to improve the interrupting performance.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Since this embodiment is somewhat similar to the conventional DFJll/I device shown in FIG. 9, the explanation will focus on the differences.

One embodiment of the present invention is shown in FIG. 1, and in the metal arc-extinguishing plate α9, commutation plate (g), and fixed contact (8), the vicinity of each tip is generally It differs from the conventional switch shown in FIG. 9 in that it is configured to widen at the end.

In Figure 1, the movable contacts (6 people) are fixed contacts (8A)
When it dissociates, an arc Q21 is generated, but this arc scream is attracted to the magnetic metal arc-extinguishing plate (l3) and becomes an arc (12A), then moves to an arc (12B) and an arc (12C). go.

By the way, the metal arc extinguishing plate α3), the commutation plate a9, and the fixed contact (8) form a state of divergence toward the end, and the arc α2 advances beyond the left part, for example, the arc (120
), the chance of contact with air increases rapidly, which acts to cool the arc 0.

The metal arc-extinguishing plate α-sa used for this purpose is, for example,
As shown in Fig. 2, a part of it is bent (however, there is no need to bend the central part).

From this, the arc Q21 can be completely extinguished without causing a ground fault or external short circuit, and in this case, in the metal arc extinguishing plate (13g) closest to the fixed contact (8A), As shown in Figure 3, the legs (
13ga) can also be used.

To explain this case, since the magnetic flux φ shown in FIG. 3 is generated around the arc U, the arc is subjected to a force in the direction shown by the arrow F.

On the other hand, +. tvJJ Club (13
ga), the force F becomes even stronger and the arc (
self) expands easily, and the initial arc voltage rises faster.

That is, in the present invention, the rate of increase in arc resistance becomes faster, so current limiting performance is improved.

From this, the arc (self) between the contacts becomes an arc (12 phantom) in a short time as shown in Figure 4, and this is attracted to the metal arc extinguishing plate other than the one shown as (13g). The arc passes through the states of arc (12B) and arc (12C), and finally becomes arc (120), which is cooled and extinguished by the metal arc extinguishing plate a9.

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

In addition, in the above embodiment, an arc horn (6B) was bonded to the tip of a movable contactor (6 phantom).
This idiot may not use this archhorn (6 people) for one history.

Furthermore, in the case of the device explained with reference to FIG. 4, only the metal arc-extinguishing plate (13g) closest to the fixed contact (8) is extended to the upper part of the fixed contact.
Metal arc-extinguishing plate (13g) and metal arc-extinguishing plate (13f)
Alternatively, the metal arc-extinguishing plate (13a) closest to the commutation plate (self) may also have the same length.

Furthermore, the fixed contact (8) may be equipped with an arc runner as shown in FIG.
Naturally, this arc runner α■ will be used with its tip folded down.

That is, in the embodiment shown in FIG.
), an arc runner 06} bent in an inverted L shape is electrically connected to the fixed contact (8 people) side end of the arc runner 06}, and a notch (14A
), the movable contact (6) passes through the above fixed contact (8 people)
It is formed so that it can come into contact with the

The arc extinguishing mechanism of this device will be explained with reference to Fig. 6.
As in the case of the previous embodiment, the arc (self) is connected to the movable contact (
If it occurs between June and the fixed point (8A1), the arc runner noise above the fixed contact (8A) will cause the arc (self) on the fixed contact (8A) to The lower leg easily transfers to the arc runner's cry and becomes like an arc (12A).

When the lower leg on the arc side transfers to arc runner QG1, a current flows through the arc runner in the direction of arrow X in Figure 6, and the arc (12A) is further driven toward the terminal section (8B) of the fixed contact. be done.

The arc (12A) has its upper leg as a movable contact (6 people)
is transferred to the tip of the movable contact (6), and is drawn into the metal arc-extinguishing plate (03), and the lower leg is connected to the metal arc-extinguishing plate (1).
It travels on the arc runner QGI via the fox extinguishing board (13c) to the arc extinguishing board (13e) of 3+.

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 Ti flow flowing through the arc runner, and is transferred from the fixed contact (6) to the arc horn (6B). It travels above the arc horn (6B) and reaches the upper end of the arc horn (6B).

Then, from the upper end of the arc horn (6B), the metal extinguisher plate 0
The arc (12C) extended through the metal arc extinguishing plate (131) reaches the arc runner 01 via all of the arc extinguishing plates (13a) to (13e).

Next, the upper leg of the arc (12C) transfers to the commutation plate α9 and runs outward (to the right in the figure) to complete the entire arc extinguishing plate constituting the metal arc extinguishing plate α3). The arc (12D) connects the arc runner (10) via (13a) to (13e).
) and the arc is extinguished.

By providing the arc runner in this manner, the driving speed of the arc surface can be further increased, and therefore both the current limiting performance and the interrupting performance can be further improved.

Further, another embodiment will be explained with reference to FIG. 7. This embodiment shows an example in which an arc horn (6B) is applied to a U-shaped fixed contact (8) and a movable contact (6). The generated arc (support) is not only attracted to the magnetic metal arc extinguishing plate (13g), but also to the fixed contact (8g).
), the lower leg of the arc (self) can easily transfer from the fixed contact (8) to the fixed contact (8) due to the magnetic field created by the current (arrow This reduces the wear and tear of the fixed contact (8), and the arcing time is shortened as the arc is powerfully driven.
Breaking performance will be further improved.

Furthermore, Fig. 8 shows the application of the present invention to a wiring disconnector, in which αη indicates the rotation axis, and ■■■ indicates a stranded wire. 6) and commutator plate (2) are electrically connected.

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

In addition, in FIG. 8, it is clear that the effects of the present invention can be enjoyed even without the arc runner α6).

The above-mentioned embodiments have been described based on the assumption that the present invention is applied to an electromagnetic contactor or a molded case circuit breaker, but the present invention can also be applied to an electromagnetic circuit breaker such as an air circuit breaker. Needless to say, it is applicable.

〔Effect of the invention〕

As described above, according to the present invention, the vicinity of the ends of the metal arc-extinguishing plate, fixed contact, and commutation plate are configured to widen toward the end, and can be diffused, so that the rise of the arc voltage is increased and the arc It is possible to improve the interrupting performance by stretching the

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part for explaining arc extinguishing operation according to the present invention, Fig. 2 is a perspective view of a metal arc extinguishing plate, and Fig. 3 is a plan view showing the relationship between the metal arc extinguishing plate and a fixed contact. , FIG. 4 is a cross-sectional view showing another embodiment of the present invention, FIG. 5 is a perspective view of a partially improved fixed contact, and FIG. 6 is a cross-sectional view of still another embodiment of the present invention. 7 and 8 are sectional views according to still other embodiments, FIG. 9 is a partial sectional view of a prior art switch, and FIG.
The figure is a sectional view of the main part of the prior art switch for explaining the arc extinguishing function.
FIG. 11 is a perspective view of a conventional metal contactor. (61-M rJjJ contact, (6A)-movable contact, (
6B) Arc horn, (8)・Fixed contact, (8 people)・Fixed contact, (131・・Metal arc extinguishing plate, (13a) ~
(13gl... arc extinguishing plate, (13ga) arc extinguishing plate leg, arc runner, +181 stranded wire. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A fixed contact joined to a fixed contact, a movable contact facing this fixed contact and joined to a movable contact, and a plurality of contacts parallel to the fixed contact and spaced apart from each other by a predetermined distance, and on the tip side of the movable contact. A switch including a metal arc-extinguishing plate and a commutator plate above the movable contact, characterized in that at least the vicinity of the ends of the commutator plate and the metal arc-extinguishing plate are expanded radially. switch.