JPS59181421A - Power switching device - 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] This invention relates to a power switching device that switches and closes current.

In particular, it relates to its arc extinguishing mechanism.

The main applicable switches of the present invention include electromagnetic contactors, circuit breakers, etc. First, an example of a conventional electromagnetic contactor will be described with reference to FIG. General 1B electromagnetic contactor is symmetrical, so
FIG. 1 shows only one side in cross section.

In the figure, (I) is a mounting base, (2) is a fixed core laminated with silicon steel plates on this mounting base, and (3) is a fixed core (
2) is a movable core that is also laminated with silicon steel plates, and (4) is a movable core (3) is a fixed core (2) is a driving force that attracts a movable core against a tripping spring (not shown). The operating coil (5) is a crossbar with square windows.

At its lower end, a movable iron core (31 mm) is held. (6) is inserted into the corner window of the cross bar (5) and pushed out (7
) A movable contact held by 0) A)
b] moving contact provided on this movable contact (6),
(6J3) is an end of a movable contact, (8) is a fixed contact that is provided opposite the movable contact (6) and conducts current, and (8A) is a fixed contact that is provided on this fixed contact (8). The above-mentioned 1 J moving contact (6A) is a fixed contact that can be moved on and off. (9) is a terminal screw for connecting the electromagnetic contactor body to an external circuit.

0α is a fixed tangent) 1su (Höss who reprints child (8), (
II) iO phase barrier, (11Al+ is contact f6
1. (8) Use a horn bar that touches the soil surface.

A metal arc-extinguishing plate 031 made of a magnetic material is provided inside to extinguish the arc (1F) that occurs between the fixed contact (8A) and the movable contact (6A). This figure shows several states of the fixed contact (8) and the fixed contact (8A).This metal arc-extinguishing plate 0■ covers the fixed contact (8A) and connects both contacts (6A) and (8A). It is constructed as a U-shaped frame that is erected parallel to the opposite direction, and the fixed contact (
8) is provided with a notch (141) for inserting it.Next, the operation will be explained.When the operation coil (4) is completely demagnetized, it is movable by a tripping spring (not shown). The iron core (31) is separated from the fixed iron core (2), and the ``Cos bar (5) is also separated from the first
It occupies the state shown in the figure, with a fixed contact (8A) and a movable contact (6A).
A) is opened and an arc O2 is generated between both contacts (6A) and (8A), but this arc (13) is extinguished at the current zero point by the metal arc extinguishing plate αJ, and the current is interrupted. .

The arc O2 extinguishing process in this conventional electromagnetic contactor will be explained in more detail with reference to FIG. 3, which shows a cross section of the arc extinguishing chamber.

Movable contact (6A) c! : Fixed contact (8A) c!
: The arc (115 ft) generated between
2A), and as the extended arc (12A) increases, the arc voltage increases, so between the movable contact end ('6B) old metal arc extinguishing & G3+, and Dielectric breakdown occurred between the metal arc extinguishing plate (131) and the fixed contact (8) tongue, and the arc (12A) was divided into two arcs (12B) and (120).

These two arcs (42B), (
12C) is extinguished.

In a conventional electromagnetic contactor where the arc is extinguished by such a process, if an arc (12B) occurs at the movable contact end (6B) at a position as shown in FIG.

A magnetic flux shown by a broken line is generated around the arc (12B), and the arc (12B) is driven in the direction of the surface facing the movable contact end (6B) of the metal arc-extinguishing plate f13111. There is no chance of causing any inconvenience. If the arc (12B) occurs at the position shown in Figure 5, the L roller
A magnetic flux T shown by the broken line is generated around B) and an arc (12B
) is driven toward the corner of the U-shaped metal arc-extinguishing plate 03) (3). Therefore, the arc (1
The location of occurrence of 2c) is as shown in Figure 6.

The interphase barrier 01) shown in FIG. 5 is damaged by the heat of the arc (120), and as a result of being opened and closed many times, holes are formed and a short circuit occurs between the phases.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the metal arc-extinguishing plate is composed of a trough-like curved surface or a multifaceted surface in which the lower angle between adjacent surfaces is an obtuse angle. parallel to the approach and separation directions.

The purpose of this is to reduce damage to the interphase barrier due to arc heat by using a structure in which the curved or multifaceted recesses are arranged to face the end of the movable contact.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

In Figures 7 and 8, the metal arc extinguishing plate 0 problem is ftifl
In the state.

A recess (
In this figure, the left side) is arranged so as to face the movable contact end (6B) (4).

In a device having the metal arc-extinguishing plate 0 drawn and arranged in this way, the arc (12B) or the movable contact end (6
Even if it occurs in the location shown in Figure 1 in B).

A magnetic flux shown by a broken line is generated around this arc (12B), and the arc (12B) is driven in the direction shown by an arrow.

Therefore, as shown in Figure 8, the arc (12C) will occur at a location farther away from the interphase barrier αB, reducing thermal damage to the interphase barrier 01) and causing a short circuit between the phases by creating a hole in the interphase barrier 0υ. It can also be suppressed.

FIG. 9 shows another embodiment of the invention.

In the figure, the metal arc-extinguishing plate is composed of a gutter-like curved surface.
The concave portion of the curved surface is arranged parallel to the contact/separation direction of both contacts (sA) and (8A) so as to face the movable contact end (6B).

In the device having the metal arc-extinguishing plate θ31-'p configured and arranged in this manner, thermal damage to the mutual barrier αυ can be reduced, and mutual short circuit can also be suppressed, as in the above embodiment.

FIG. 10 shows another embodiment of the invention.

The movable contact end (6T3) of the metal arc-extinguishing plate [131] shown in FIGS. 7 and 8. U-shaped protrusion (13B) in the vicinity of the stationary contact (8) on the opposing surface (LIA). 'p
Shadow formation, this U-shaped protrusion (13B)' has a movable contact (6
A) is provided so as to protrude opposite to the separated space. In the apparatus configured in this way, as in the above embodiment, thermal damage to the phase barrier 01) can be reduced and phase short circuits can also be suppressed.

The arc (
lz is easily divided by the U-shaped protrusion (13B) 9
After being separated, the magnetic field created by the current flowing through the U-shaped protrusion (+5E) drives the metal arc-extinguishing plate 03) at high speed, allowing it to quickly extinguish the arc, resulting in extremely excellent breaker performance. can be demonstrated.

It goes without saying that the present invention can be expected to have similar effects on fixed contacts (8) having different shapes as shown in FIG.

In addition, as shown in Fig. 12, a protrusion (
8B), the metal arc extinguishing plate (131) and the fixed contact (
Since the distance between the projection (8B) of 8) is smaller than the distance between the metal arc extinguishing plate Q31 and the non-projection part of the fixed contact (8), the arc (12C) (8) Protrusion (8B)
The probability of occurring above is higher. 'T, that is, arc (12
Since there is a high probability that C corrosion will occur at a location farther away than the interphase barrier (11), thermal damage to the interphase barrier (11) can be further reduced.

Note that the shape of the protrusion (8B) does not have to be cylindrical as shown in FIG. 12, and may be, for example, prismatic or hemispherical.

In addition, in the explanation of 1 or more, contact (6A), (8
A) is only described as an example in which the present invention is applied to a power switchgear that is opened and closed by a McNet, that is, an electromagnetic contactor, but this invention can also be applied to other power switchgear such as a circuit breaker. It is obvious that it can be done.

As mentioned above, the main feature of this invention is the metal arc-extinguishing plate.

Consisting of a trough-like curved surface or multiple surfaces where the angle between adjacent surfaces is an obtuse angle, the curved surface or the concave portion of the multiple surfaces is arranged parallel to the contact/separation direction so as to face the end of the movable contact. By using the method described in (8), there is an effect that it is possible to reduce damage to the interphase barrier due to arc heat.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view of a conventional magnetic contactor, and Figure 2 is a partial cross-sectional view of a conventional magnetic contactor.
FIG. 3 is a perspective view showing an enlarged view of the metal arc-extinguishing plate and fixed contact shown in the figure; FIG. 5 and 6 are a plan view and a perspective view for explaining the drawbacks of the conventional electromagnetic contactor, and FIGS. 7 and 8 are the structure and operation of a metal arc-extinguishing plate according to an embodiment of the present invention. FIG. 9 is a plan view showing the configuration and operation of a metal arc-extinguishing plate according to another embodiment of the present invention, and FIGS. 10 and 11 are diagrams showing other embodiments of the present invention. FIG. 12 is a perspective view showing a metal arc-extinguishing plate and a fixed contact according to an embodiment, and FIG. 12 is a perspective view showing a fixed contact according to another embodiment of the present invention. In the figure, (6) is a movable contact, (6A) is a movable contact, (6B) is a movable contact end, (8)
is a fixed contact. (8A) is a fixed contact, 01) ζ is an interphase barrier, H, (
12A). (12B) and (120) are arcs, and 03) is a metal arc extinguishing plate. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Shin Kuzuno - Sa -; 1 Figure 5 /3 //, 4 // /2 7. 171421 (4) Fig. 2 3 No. 1 '40m 〈53 Fig. 4 factor/2B Fig. 6 3 Fig. 7 Ji''

Claims (1)

[Claims] a fixed contact, a fixed contact joined to the fixed contact, a movable contact provided opposite the fixed contact, a movable contact joined to the movable contact and capable of making contact with the fixed contact; In the device equipped with a metal arc-extinguishing plate that extinguishes the arc generated between both contacts, the metal arc-extinguishing plate h has a gutter-like curved surface or a multifaceted surface such that the angle between the adjacent surface and the blood hole is an obtuse angle. A power switchgear characterized in that the concave portion is arranged so as to face the end of the movable contact;