JPS59189512A - 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 opens and closes a flow of 1°L, 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. 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 a fixed core installed opposite to fixed core (2). The movable iron core is laminated with silicon steel plates as well as (
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), and (5) is made of plastic and has a square window. The cross spar has a movable iron core (3) at its lower end. (6) is a movable contact inserted into the corner window of the cross/<-(5) and held by a push spring (7), and (8A) is a movable contact provided on the movable contact (6). point (8) is provided opposite the movable contact (6),
A fixed contact that conducts current, (8A) is a fixed contact provided on this fixed contact (8), and (8c) is a terminal portion of this fixed contact (8).・However, (8) is the end where the electromagnetic contactor body is connected to the external circuit, (10) is the base from which the fixed contact (8) can be accessed, (
11) is a cover that covers the surface of the contactor, and the inside thereof is made of a magnetic material for extinguishing the arc (12) that occurs between the fixed contact (8A) and the movable contact (6A). A first metal arc-extinguishing plate (13) and a second metal arc-extinguishing plate (14) are provided. Figure 2 shows these metal arc extinguishing plates (13
), (14), fixed contact (8) and 1. 'il constant contact contact A) (-IS is shown. This first
The gold & i arc extinguishing plate (13) is configured as a U-shaped frame that covers the fixed contact (8A) and straddles the fixed contact (8), and the second metal arc extinguishing plate (14 ) is inside −
It is also straddled as a board.

Since it has the configuration described in -1-, when the operation coil (4) is demagnetized in this conventional electromagnetic contactor, the movable core (3) is opened from the fixed core (2) by a tripping spring (not shown), and the crossbar is opened. (5) also occupies the state shown in Figure 1,
The fixed contact (8A) and the movable contact (6A) open 1 and an arc (X
2) occurs, but this arc (12) is caused by the metal arc extinguishing plate (1
3) According to (14), the arc is extinguished at the current zero point, and the current is cut off.

The arc extinguishing process of the arc (12) in this conventional electromagnetic contactor is explained in more detail with reference to FIG. 3, which shows a cross section of the arc extinguishing chamber. (12) is attracted to the magnetic Sl metal arc extinguishing plate (13) and is stretched like an arc (12A).

At this time, the fixed contact (8) has a U-shaped cross section as shown in Figure 3, and the arc (12) is driven by the magnetic field created by the current flowing through the fixed contact (8). ,
This arc (12) will become even more intimate. When the arc (12) is stretched in this way, the arc voltage increases, so the fixed contact (8) and the first metal arc extinguishing plate (13)
between the first metal arc-extinguishing plate (13) and the movable contact (6A)
Dielectric breakdown occurs between the two, and an arc (12A)
is two arcs (12B).

(12G). One of the divided arcs (1
2G) is attracted to the second metal arc-extinguishing plate (14), and is driven by the magnetic field created by the current flowing through the fixed contact (8) and stretched like an arc ('12D). When the arc voltage increases due to the extension of this arc (120), the arc (+20) becomes two arcs (12E).

(12F), and the arc (12) is finally divided into three arcs (12B), (12E), and (12F), which are extinguished at the current zero point, and the current is cut off.

In this switch, the arc is extinguished as described above,
The arc (12B) generated between the movable contact (6A) and the first metal arc-extinguishing plate (13) is caused by the magnetic field created by the current flowing through the first metal arc-extinguishing plate (13), as shown in Figure 3. However, the arc (12E) generated between the first metal arc-extinguishing plate (14) and the second metal arc-extinguishing plate (14) is G generated by the current flowing through the metal arc-extinguishing plate (13)? The arc (1) generated between the second metal arc-extinguishing plate (14) and the fixed contact (8) is
2F) receives the force of F3 due to the magnetic field created by the current flowing through it. Since the forces F2 and F3 are almost the same in magnitude and have opposite directions, the arc generated between the first metal arc-extinguishing plate (13) and the second metal arc-extinguishing plate (14) (12E)
is the first metal arc-extinguishing plate (13) and the second gold hfX bullet-extinguishing plate (
14) It is easy to get stuck between the two. Therefore, it has the disadvantage that the breaking performance cannot be improved for 1 minute.

The present invention was made for the purpose of eliminating such drawbacks of the above-mentioned switches and providing a switch with improved shear breaking performance. M! I! II
The "T" moving contact is attached to the contact and has a U-shape with the contact side opened in order to shield these contacts.They are arranged in parallel in the contact opening direction near the tip of the fixed contact. a first metal arc-extinguishing plate disposed astride the first metal arc-extinguishing plate, and a second metal arc-extinguishing plate disposed in parallel with the first metal plate on the side farther from each contact point of the first metal plate.
The first metal arc-extinguishing plate has a U-shaped bent portion formed by folding back its lower edge to extend upward on the back surface of the first metal arc-extinguishing plate, and the bent portion is connected to the second metal arc-extinguishing plate. The first metal arc-extinguishing plate is opposed to the arc-extinguishing plate, and the top of the first metal arc-extinguishing plate is electrically connected to the phase lJ: across the power supply side and the load side.

The present invention will be explained below with reference to the embodiment shown in Fig. 4.5.6.The switch of the embodiment is the same as that of the conventional example above except for the first metal arc-extinguishing plate. Explanation will be omitted. This first metal arc-extinguishing plate (13) has a fixed contact spanning portion, that is, the lower edge 7'S of the U-shaped back u'+i.
A U-shaped bent part (13A) is provided by folding one end to one side, and this is arranged opposite to the second metal eraser 6ffi&(+4). Furthermore, this first metal arc-extinguishing plate (
A connection part (13'C:) extends from the top (13B) of the fixed contact (8) spanning part of 13) in the opposite direction of the bent part (13A) from the power supply side to the load side. The connecting portion (13C:) is connected to the other first metal arc-extinguishing plate (+3') (see FIG. 6).

A cross section of the arc extinguishing chamber to which this first metal arc extinguishing plate (13) is applied is shown in FIG.
) is generated between the fixed contact (8A) and the movable contact (8A) until the arc is extinguished.
12) is attracted to the first metal arc-extinguishing plate (13) made of magnetic material and is stretched as shown in (12A). Fixed contact (8)
If it is U-shaped as shown in Figure 3, the fixed contact (8
) is driven by the magnetic field created by the current flowing through the arc (12), and the arc (12) is further tightened. When the arc (12) is stretched, the arc voltage increases, so between the fixed contact (8) and the first metal arc extinguishing plate (13), the first metal arc extinguishing plate (13) and the movable Dielectric breakdown occurs between the contacts (6A) and the arc (12A) is divided into two arcs (
12B) and (12G). One of the divided arcs (12G) is attracted to the second metal arc-extinguishing plate (14), and is driven by the magnetic field created by the current flowing through the fixed contact (8), and is stretched as shown in (120). .

When this arc (120) is separated and the arc voltage increases, the arc (120) becomes two arcs (12E),
It is divided into (12F). The arc (12) is finally divided into three arcs (12B), (12F), and '(12F), and the arc (12F) is connected to the second metal arc extinguishing plate (14
) The arc is extinguished between the arc lead part (14B) and the fixed contact. By the way, since a foot of the arc occurs at the U-shaped bent portion (13A) of the first metal arc-extinguishing plate (13), the distance between the first metal arc-extinguishing plate (13) and the second metal arc-extinguishing plate (14) is The arc (12E) generated between the metal arc extinguishing plates (13) receives the force of F2 due to the magnetic field created by the current flowing through the U-shaped bent part of the first metal arc extinguishing plate (13). A-dissipating plate (14) and fixed contact (8)
) is subjected to a force of F3 due to the magnetic field created by the current flowing through the arc (12F). Since the directions of +2 and F3 are the same, the arc (12E) is strongly driven and extinguished, resulting in long-lasting shearing performance. In addition, since the first metal arc extinguishing plate (13) on the power supply load side was connected to serve as a commutating electrode, the arc (12B) on the movable side
The current is quickly commutated to the gold 1 bar arc extinguishing plate (13), reducing wear on the contacts. Furthermore, since the first and second metal arc-extinguishing plates are provided as described above, whether the arc is caused by these first or second metal arc-extinguishing plates. second 2
1 metal arc extinguishing plate (+3).

(14), the arc-extinguishing speed is accelerated, and since this first metal arc-extinguishing plate (13) surrounds 31nj of movable contact (6A) 1, the circumference of movable contact (6A) In addition to suppressing damage to the insulation of the
Under the influence of the magnetic field generated in the metal arc-extinguishing plate (13), the arc is attracted to it faster, further improving the arc-extinguishing ability. Although only an example in which the present invention is applied to a switch that opens and closes by means of *, that is, an electromagnetic contactor, it is obvious that the present invention can also be applied to other switches such as a circuit breaker.

As described above, according to the present invention, it is possible to reduce the wear and tear of the contacts, further improve the arc extinguishing ability, obtain excellent breaking performance, and improve the durability of the switch. There are benefits to be gained.

[Brief explanation of the drawing]

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, and Figure 3 is an explanatory diagram of the arc extinguishing operation of the switch in Figure 1.l) 4 The figure is a perspective view showing a second metal arc-extinguishing plate according to an embodiment of the present invention, FIG. 5 is an explanatory diagram showing the arc-extinguishing operation of the embodiment of the present invention, and FIG. 6 is an embodiment of the present invention. FIG. 2 is a sectional view of main parts. (6)...Movable contact, (6A)...Movable contact, (8)...Fixed contact, (8A)...+
iIa constant contact, (12), (12A) ~ (12F)
... Arc, (+3) ... First metal arc-extinguishing plate, (1
3G)... Connection portion, (14)... Second metal arc-extinguishing plate. Note that the same reference numerals in the drawings indicate the same or equivalent parts. 'MO 1 Figure 3 2 Figure payment A Figure 3 Figure 4 Figure-5 Figure Showa Year Month l''i'4+'j'l Director-General 1 ``II-Display 11;
227432 Name of the invention Switch 3, 'f+li, +1-Relationship with the old case 1.1 Permission + at1 person address
Heavy Industries; [Chiyo, Tokyo 111-ku Marunouchi-11112-35M / Name (601) Mitsubishi Electric Corporation Representative 111f-8 Part 4 Agent Address Chiyo, Tokyo] 1J-ku Marunouchi 2-chome 1;
2nd 3′! -'j-Mitsubishi Electric Corporation 5, Detailed explanation of the invention in the specification subject to amendment 1゜6, Contents of amendment (1) r (11) in the second line of page 3 of the specification refers to electromagnetic contact r(11) corrects the statement "The upper surface of the magnetic contactor..." to read "The upper surface of the magnetic contactor mj...". From F

Claims (1)

[Claims] The fixed contact is connected to the stationary contact, the movable contact is connected to the movable contact facing the fixed contact, and the U-shaped contact is opened on the contact side to shield these contacts. A metal arc-extinguishing plate t31 is arranged in parallel in the separating direction and straddled near the tip of the fixed contact; A metal arc-extinguishing plate is provided, and the back side of the first metal arc-extinguishing plate has a U-shape If whose edge is folded back and extends to the upper part.
, forming a bent portion, and making the bent portion face the second metal arc-extinguishing plate, and the top 1°ζ of the first metal arc-extinguishing plate.
A switch characterized in that a source side and a load side are electrically connected to each other.