JPS59112513A - 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 will be described with reference to FIG. 2 in Figure 1, (1) is a mount made of glass, (2) is a fixed core laminated with silicon steel plates on this mount, and (3) is installed opposite to the fixed core (2). A movable iron core laminated with silicon steel plates, similar to this one, (
4) is an operating coil that provides a driving force to attract the movable iron core (8) and fixed iron core (2) against a tripping spring (not shown), and (6) is made of plastic and has a square window. The crossbar has a lower end that holds a movable iron core (8). (6) is a movable contact 1 inserted into the corner window of the crossbar (5) and held by a push spring (7).
．． (6A) is a movable contact provided in the movable contactor (6),
(8) is a fixed contact provided opposite the movable contact (6) and conducts current, (8A) is a fixed contact provided on this fixed contact (8), and (8C) is also this fixed contact. The terminal portion of the fixed contact (8) is shown.

Therefore, (9) is a terminal screw for connecting the electromagnetic contactor main body with an external circuit, α0) is a base for attaching the fixed contact (8), and (2) is a cover that covers the top surface of the electromagnetic contactor, and inside it is a A first metal arc-extinguishing plate α3) made of a magnetic material and a second metal arc-extinguishing plate ( 14-)
and is provided. Figure 2 shows these metal arc extinguishing plates U8
).

04), the fixed contact (8), and the fixed contact (8A). This first metal arc-extinguishing plate 09) is configured as a U-shaped frame extending over the fixed contact (8) and covering the fixed contact (8A), and the second metal arc-extinguishing plate 04) ) is similarly straddled on the outside as a single version.

With the above configuration, when the operation coil (4) is demagnetized in this conventional electromagnetic contactor, the movable core (3) is separated from the fixed core (2) by a tripping spring (not shown).
The crossbar (5) also occupies the state shown in FIG. 1, where the fixed contact (8A) and the movable contact (6A) are separated and an arc ( However, this arc (the effect is metal arc extinguishing plate a3), (14
), the arc is extinguished at the current zero point and the current is cut off.

The arc extinguishing process in this conventional electromagnetic contactor is explained in more detail as shown in Figure 6, which shows a cross section of the arc extinguishing chamber. ,
- is attracted by the first metal arc-extinguishing plate αB made of magnetic material and is stretched like an arc (12A).

At this time, since the fixed contact (8) has a U-shaped cross section as shown in Fig. 6, the arc (12) is moved more quickly by the magnetic field created by the current flowing through the fixed contact (8). Driven by this arc (he is further stretched).

When the arc (12A) is stretched in this way, the arc voltage increases, so between the fixed contact (8) and the first metal arc extinguishing plate (18), the first metal arc extinguishing plate 08) and the movable Dielectric breakdown occurs between each contact point (6A), and the arc (12A) is divided into two arcs (12E) and (120). One of the divided arcs (izc) is the second
The arc (12D
). When the shear voltage increases due to the extension of this arc (12D), the arc (12D) is further divided into two arcs (12K) and (12F), and the arc (b) finally becomes five arcs (12B).

(12E) and (12F), the arc is extinguished at the current zero point, and the current is cut off. However, in such a switch, when the arc is extinguished as described above, the arc (12B) generated between the movable contact (6A) and the first metal arc extinguishing plate 03) is 1 metal arc extinguishing plate (1
B) The driving force of Fl moves upward due to the magnetic field created by the current flowing through the first metal arc-extinguishing plate (1B) and the second metal arc-extinguishing plate (1B).
The arc (12E) generated between the metal arc extinguishing plates 04) is
The current flowing through the arc (12F) generated between the second metal arc-extinguishing plate 04) and the fixed contact (8) due to the force of F2 due to the magnetic field created by the current flowing through the first metal arc-extinguishing plate 03) It receives a force of F3 due to the magnetic field created by . and forces F2 and F
The size is almost the same as 3, but the direction is opposite, so
The arc (11) generated between the first metal arc-extinguishing plate (13) and the second metal arc-extinguishing plate 0→ is caused by the arc between the first metal arc-extinguishing plate (1B) and the second metal arc-extinguishing plate It is easy to get stuck in between. Therefore, it has the disadvantage that sufficient breaking performance cannot be obtained.

The present invention was made for the purpose of improving the breaking performance of a switch in order to eliminate the above-mentioned drawbacks.The present invention is characterized by a fixed contact joined to a fixed contact, a It can be attached to the movable contactor.
In a switch equipped with contacts, and arc-extinguishing plates that are U-shaped with the contact side open to shield these contacts, and are arranged in parallel in the contact opening direction and straddled near the tip of the fixed contact. , the fixed contact is formed with an extension part extending through a bent step on the terminal side, and an arc-inner part erected along the vertical side of the step is attached to the back surface of the metal arc-extinguishing plate. The metal arc-extinguishing plate has a U-shaped bent part on the back surface thereof which is completely folded back at its lower edge and extends upward.

The present invention will now be explained with reference to the embodiments shown in FIGS. 4 to 6. The arc-extinguishing mechanism according to the non-embodiments omits the conventional second metal arc-extinguishing plate C14), and mainly It is composed of a movable contact (6), a fixed contact (8), an arc runner section provided thereon, and a metal arc extinguishing plate (15'). That is, FIG. 4 shows the metal arc-extinguishing plate (1
As is clear from the same figure, this metal arc-extinguishing plate (15') is formed in a U-shape, and the back surface (13
'A) and two parallel side surfaces (13'B), and furthermore, the back surface (13'A) has a U-shape formed by bending its lower part outward into a U-shape. A shaped bent portion (13') is formed.

Also, as can be seen from Figure 5, which shows the cross section of the arc extinguishing chamber,
The fixed contact (8) is formed with an extension part extending in a crank shape through a bent step bent downward on the opposite side of the fixed contact (8A), that is, on the terminal side. An arc runner part (■) is erected along the vertical side (8B) of the stepped part, and this is fixed via a rivet OQ, and the free end side of this arc runner part (@) is connected to the U-shaped bent part (1).
3'C).

Next, the arc ((2) is the fixed contact (8A) and the movable contact (6A)
A) The process from when the arc is generated until it is extinguished will be explained based on FIG. 6, which shows the right half of FIG. 5. The arc (12N) is attracted to the metal arc-extinguishing plate (13') made of a magnetic material and is stretched as shown in (12A).If the arc (2) is stretched in this way, the arc voltage increases, so it is not fixed. Dielectric breakdown occurs between the contact (8) and the metal arc-extinguishing plate (1!l'), and the arc (12A)
12B) and arc (12C).Arc (
12B) is driven upward by the driving force (F) created by the magnetic field on the back side of the metal arc extinguishing plate (13'A), and the other divided arc (12A) An arc (12D) driven by a magnetic field created by a flowing current,
(12E). At this time, a driving force (F2) is applied to these arcs by the magnetic field created by the current flowing through the U-shaped bent part (13') of the metal arc-extinguishing plate, and the fixed contact (8) is The driving force (F3) is generated by the magnetic field created by the current flowing through the arc runner part 05).
acts in the same direction as the driving force (F2), the arc (12E) is more strongly driven upward and extinguished, resulting in excellent breaking performance.

As shown in the paper, the metal arc-extinguishing plate (13') according to this embodiment has a back surface (13'A) and two side surfaces (13'B) I
Since the movable contact is surrounded by (13'B), it is possible to prevent the influence of the arc on the insulating material on the side wall, thereby preventing the reduction of such insulating material. The metal arc-extinguishing plate (13'
) can provide the effect of rapid suction.

Furthermore, the metal arc-extinguishing plate (13') has a U-shaped bent part (
Since the arc 13' is formed, the arc (12E) guided between this and the arc runner part In addition, since the arc runner section (15) is installed upright on the vertical side (8B) of the stepped part of the fixed contact (8), the metal arc extinguishing of the conventional metal arc extinguishing device 2 is not possible. Board 04)
The arc runner section (1
5) can be set stably and firmly with a simpler configuration.0 In addition, in the above embodiment, the vertical side of the stepped portion of the fixed contact (8) (
Although the arc runner part μs) is joined to 8B) by a rivet α6), it is obvious that other joining methods can be selected, and furthermore, the fixed contact (8) may be bent downward as shown in the above embodiment. It goes without saying that the crank-shaped extending portion may also be configured as a crank-shaped extending portion bent upward. In this case °, rivet α
6) also has the effect of drawing the arc (12D) to the center of the arc runner section C15).

In addition, in the explanation on the paper, only an example in which the present invention is applied to a switch that opens and closes the contacts using a magnet, that is, an electromagnetic contactor, but for example, other switching devices such as circuit breakers etc. It is obvious that this can also be applied to vessels.

As described above, according to the present invention, it is possible to obtain a switch with excellent interrupting performance, and also to prevent damage to the insulator disposed adjacent to the arc extinguishing chamber.

[Brief explanation of drawings]

Figure 1 is a partial sectional view of a conventional switch; Figure 2 is an enlarged view of the main part of the switch shown in Figure 1, showing the arc extinguishing chamber; Figure 6 is an explanatory diagram of the arc extinguishing operation of the switch in Figure 1; 5 is a perspective view showing a metal arc-extinguishing plate according to an embodiment of the present invention, FIG. 5 is a sectional view of an arc-extinguishing chamber of an embodiment of the present invention, and FIG. 6 is an explanation showing the arc-extinguishing operation of the embodiment of the present invention. It is a diagram. (6)...Movable contact (6A)...Movable contact (8)
・・Fixed contact (8A)・・Fixed contact (8B)・・
Stepped vertical side (121, (12A) to (12K)...Arc 031
, (13')...Metal arc extinguishing plate (13'...U-shaped bent part 05)...Arc runner part Note that the same reference numerals in the drawings indicate the same or interrelated parts. 1 Figure 3 Figure 4 Figure 5 Figure 6 Procedural amendment (voluntary) 58 5 16 Commissioner of the Japan Patent Office 1, Indication of the case Japanese Patent Application No. 57-221183 2
, the name of the invention. Switchgear 3, relationship with the amended case Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent address Tokyo Miyakochiyo B1-ku Marunouchi 2-2-3
No. 5, Mitsubishi Electric Corporation, detailed description of the invention in the specification subject to amendment. 6. In the statement of contents of the amendment, page 2, line 20, the statement "r (I l) is for the top surface of the electromagnetic contactor" has been replaced with "r (11) is for the top surface of the electromagnetic contactor." to correct. Below

Claims (1)

[Claims] The contact consists of a fixed contact joined to a fixed contact, a movable contact facing the fixed contact and joined to a movable contact, and a U-shape with the contact side open to shield these contacts. In a switch equipped with a metal arc-extinguishing plate arranged in parallel in the opening direction and straddling the vicinity of the tip of the fixed contact,
The fixed contact has an extension part extending through a bent step on the terminal side, and an arc runner part erected along the vertical side of the step is provided on the back side of the metal arc-extinguishing plate. A switch characterized in that the metallic arc-extinguishing plate is opposed to each other, and a U-shaped bent portion is formed on the back surface of the metal arc-extinguishing plate by folding back its lower edge and extending upward.