JPS59111210A - 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 The present invention relates to a switch that switches on and off current, and particularly to an arc extinguishing mechanism thereof.

The main applicable switches of the present invention include electromagnetic contactors and circuit breakers.

First, an example of a conventional electromagnetic contactor according to a prior proposal by the inventors will be described with reference to FIG. In Figure 1, (
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 installed opposite to fixed core (2) and is also laminated with silicon steel plates. (4) 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 made of plastic. It is a crossbar with a square window and holds a movable iron core (3) at its lower end. (U) is a movable contact inserted into the corner window of the crossbar (5) and held by a push spring (7), (6A) is a movable contact (6)
A movable contact provided in (8) is the movable contact (6)
(8A) is a fixed contact provided on this fixed contact (8), and (8B) is a terminal part of this fixed contact (8). show.

Therefore, (9) is a terminal screw for connecting the electromagnetic contactor main body to an external circuit, (1o) is a base for attaching the fixed contact (8), and (11) is a cover that covers the top surface of the electromagnetic contactor.
A magnetic metal arc-extinguishing plate (13) is provided inside of it to extinguish the arc (12) generated between the fixed contact (8A) and the movable contact (6A), and this metal arc-extinguishing plate (13
) are cumulatively arranged in parallel with and above the fixed contact (8) facing the movable contact and spaced apart from each other by a predetermined distance, as is clear from FIG.

Since it has the above configuration, when the operation coil (4) is demagnetized in this electromagnetic contactor, the movable core (3) is separated from the fixed core (2) by a tripping spring (not shown), and the crossbar (5) is also separated from the first Occupying the state shown in the figure, the fixed contact (8
A) and the movable contact (6A) are separated and the fixed contact (8A)
An arc (12) is generated between the contact point and the movable contact (6A), but this arc (12) is attracted to the metal arc extinguishing plate (13) as shown in Fig. 2 and is stretched out like an arc (12A). , and finally the arc (12A) reaches (1) of the arc extinguishing plates (13a) to (13F) from the tip of the movable contact.
3c) to (13f), the arc (12B) is transferred to the fixed contact (8) and extinguished, and the current is cut off.

However, in such an arc (12) extinguishing operation,
A metal arc-extinguishing plate (
Of 13), the arc-extinguishing plates (13a) and (13b) do not contribute to the arc-extinguishing operation at all, and as a result, the shear-breaking performance is inferior and the contact points of each of the contacts are subject to increased wear and tear.

The present invention was made to solve the drawbacks of soft soil, and includes a fixed contact joined to a fixed contact, a movable contact opposite the fixed contact and joined to a movable contact, and a movable contact parallel to the fixed contact. In a switch equipped with a plurality of metal arc-extinguishing plates stacked in parallel at a predetermined interval from each other, a commutation electrode is arranged in parallel on the movable contact so as to face it, and the tip of the commutation electrode is A U-shaped bent part is formed in the U-shaped bent part, and a cutout part is bored across the inner vertical wall and bottom of the U-shaped bent part to allow the movable contact to move up and down, and this U-shaped J C] It is characterized in that the outer standing wall of the curved portion faces the metal arc-extinguishing plate.

Hereinafter, the present invention will be explained based on the embodiments shown in FIGS. 3 to 6, with the same or corresponding parts being designated by the same reference numerals. - End of the fixed contact (8A) of the fixed contact (8) An arc runner (14) bent in an inverted shape is electrically connected and installed as shown in Fig. 3, and a notch (14A) is provided in the bent part of the arc runner (14). The movable contact (6) is formed so as to pass through this notch (14A) and come into contact with the fixed contact (8A). FIG. 4 is an enlarged view of the main part of the commutation electrode (15), and as is clear from the figure, the commutation electrode (15)
) is bent into a U-shape near its tip, and a notch (15A) is formed at the tip of the inner vertical wall (15A) of the bent portion.
5B) to the bottom surface (15C:), and is configured such that the movable contactor (6) can move up and down the notch (15A). Then, the outer vertical wall (150) of this U-shaped bent portion is connected to the metal arc-extinguishing plate (13) at a distance (
L) are placed facing each other.

In addition, the above distance! ! A (L) must be at least 3 mm or more, and if the distance is less than 3 mm, the outer vertical wall (1
It has been confirmed through experiments that the arc remains stuck between the metal arc-extinguishing plate (13) and the metal arc-extinguishing plate (13) closest to it, resulting in poor cutting performance.

However, if the arc extinguishing operation of the arc extinguishing mechanism having the above configuration is explained based on FIG.
However, this arc (12) is attracted to the magnetic metal arc-extinguishing plate (13) and is stretched out, resulting in an arc (12A).
). At this time, since the arc runner (14) is provided at a higher position than the surface of the fixed contact (8),
The lower leg of the arc (12) on the fixed contact (8A) is easily transferred to the arc runner (14) and becomes an arc (12A). When the lower leg of the arc (12) transfers to the arc runner (14), current flows in the arc runner (14) in the direction of the arrow in Fig. 4, and the arc (12A) moves further toward the terminal section (8B) of the fixed contact. driven by. On the other hand, the upper leg of the arc (12) on the movable contact (6A) is driven not only by the metal arc extinguishing plate (13) but also by the magnetic field created by the current (indicated by the arrow in Figure 15) flowing through the arc runner (14). be done. At this time, if a magnetic material is used as the material for the commutating electrode (15), a strong magnetic field is generated by the current flowing through the movable contact (6) as shown in Figure 4, resulting in an arc (direction of arrow B in Figure 4). Since the driving force (F) acts on (12), the arc (12) is even stronger than the metal arc extinguishing plate (1
3) Driven to the side. Furthermore, as shown in FIG. 5, the bottom surface (15G) of the commutation electrode (15) is located 1δ closer to the fixed contact (8A) than the movable contact (6A), so that the movable contact (6A) The upper leg of the arc (12) is quickly transferred from the movable contact (6A) to the commutating electrode (15), and further the arc (12) is extended like an arc (12A). This arc (12A) is driven by the magnetic field created by the current flowing through the commutating electrode (15) and arc runner (14), and like the arc (12B), a metal arc extinguishing plate (13)
The arc is finally extinguished as an arc (12C) via all the arc extinguishing plates (+3a) to +3e). However, the arc (12
) is quickly transferred to the arc runner (14), and the upper leg of the arc (12) on the movable contact (6A) is also quickly transferred from the movable contact (6A) to the commutating electrode (1).
5), and each of the above contacts (6A) and (8
A) consumption is reduced. Furthermore, in this embodiment, all the arc-extinguishing plates (13a) to 13e) are effectively utilized, so that extremely excellent shear cutting performance can be obtained.

Further, according to the above embodiment, the arc (12) is quickly transferred from the movable contact (6A) to the commutating electrode (15), so even in the case of a switch that opens and closes frequently, the movable contact ( 6) is suppressed, and thermal damage to the crossbar (5) can be reduced.

The second embodiment will be explained based on FIG. 6. In this embodiment, the metal arc-extinguishing plate (13) and the commutating electrode (+5 ) This shows an example of applying Q. The generated arc (12) is driven by the magnetic field created by the current flowing through the fixed contact (8) (indicated by the arrow in Figure 6), so the lower part of the arc (12) The foot can be easily transferred from the fixed contact (8A) to the fixed contact (8), reducing wear and tear on the fixed contact (8A), and since the arc (12) is powerfully driven, the arc time is reduced. This will further improve the breaking performance.

Furthermore, Fig. 7 shows a circuit breaker to which the same arc extinguishing mechanism as in the first embodiment is applied. (17), the commutation electrode (15) and the movable contact (6) are electrically connected. In this case, it goes without saying that the same effect as in each of the embodiments described above can be obtained even if the number of steps is 1/).

In addition, the switch having an arc extinguishing chamber according to the present invention has an arc extinguishing plate (13a) constituting the metal arc extinguishing plate (13).
+3e) By increasing or decreasing the number of sheets in the upper and lower curves, it is possible to easily create a switch that corresponds to the required voltage.

Therefore, even if the open 11 latitude is applied to high voltage,
Same dimensions as lower voltage ones)! Since the switch according to the present invention can be constructed with a high voltage, the higher the voltage, the more effective the switch can be.

In addition, in the explanation above, we have explained the switch that opens and closes the contact using a magnet, that is, the switch that is applied to electromagnetic contact 2 diagnostics and circuit breakers, but it can also be applied to other switches. It's obvious that the same applies.

According to the present invention, since the commutation electrode is provided,
By using all metal arc-extinguishing plates, a switch with excellent interrupting performance f1 can be obtained, and wear and tear on the contacts of the contacts can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a conventional switch, Fig. 2 is an explanatory diagram of the arc extinguishing operation of the one in Fig. 1, Fig. 3 is an enlarged view of a B6 main point of a fixed armature to which the arc runner according to the present invention is applied. , 4th
The figure is an enlarged view of the main parts of the commutation type JU according to the embodiment of the present invention.
The figure is an explanatory diagram of the arc extinguishing operation of the embodiment of the present invention, Figure 6 is an enlarged view of the main part showing an embodiment in which the commutation electrode of the present invention is applied to another fixed contact, and Figure 7 is the same as Figure 5. FIG. 2 is an enlarged view of main parts when the arc extinguishing chamber is applied to a wiring breaker. (6)...Movable contact, (8A)...Movable contact, (8)...Fixed contact, (8A)...Fixed contact, (+3)...Metal arc-extinguishing plate, (13a
) ~ (13f) - arc extinguishing plate, (14)... arc runner, (15)... commutation electrode, (15A)... notch, (15B)... inner vertical wall, (15G)...・・・
Bent part bottom (bottom), (150)...outer standing wall (
L)...separation distance. Agent Shin Kuzuno - 1st. @ 2nd (! 1 3 Fig. 4 15 Fig. 5 Riji It+ Fig. 6

Claims (4)

[Claims] (1) A fixed contact connected to a fixed contact, and a fixed contact connected to a movable contact facing the fixed contact. i1 contact, in a switch equipped with a plurality of metal arc-extinguishing plates cumulatively arranged parallel to the fixed contact at a predetermined interval from each other, commutating electrodes are arranged in parallel on the movable contact so as to face it; A U-shaped bent portion is formed at the tip of the commutation electrode, and a notch is bored from the inner vertical wall to the bottom of the U-shaped bent portion to allow the movable contact to move up and down, Katsuko U
A switch characterized in that an outer standing wall of the letter-shaped bent portion faces the metal arc-extinguishing plate. (2) The switch according to claim 1, wherein the facing distance between the outer standing wall of the U-shaped bent portion of the commutation electrode and the metal arc-extinguishing plate is at least 3 mm. (3) An inverted arc runner is provided at the tip of the fixed contact, and a notch is provided in the bent portion of the arc runner to allow the movable contact to pass through.
The switch according to paragraph 2 or paragraph 2. (4) The switch according to claim 1 or 2, wherein the fixed contact is formed in a U-shape.