JPS58169820A - Electromagnetic 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 The present invention relates to a power switching device that opens and closes an electric circuit.

1 to 4 show an example of a conventional power switchgear. In these figures, (1) is a mounting base made of a metal steel plate, and this mounting base (1) has a plurality of mounting holes (
1a) is provided. (2) is a base made of an insulating material, and is fixed to the mounting base (1) with screws (3).

(4) is a fixed core made of laminated silicon steel plates, and this fixed core (4) is equipped with an operating coil (5).
A leaf spring (6) is provided as a cushioning material in the gap between the mounting base (1) and the mounting base (1). A movable core (7) is disposed opposite the fixed core (4), and is configured to be attracted to the fixed core (4) when the operating coil (5) is energized. A crossbar (8) is made of an insulating material and is connected to the movable iron core (7) via a pin (9). α
e is a trip spring disposed between this crossbar (8) and the mounting base (1), which normally pushes up the crossbar (8) so that the main circuit of this power switchgear is opened. There is. aD is a movable contact provided with a movable contact (11a), which is inserted into a holding hole (8a) K provided in the crossbar (8) and is pressurized by a pressure spring α. The terminal is a fixed contact equipped with the movable contact 11) and a fixed contact (13a) facing the movable contact (11a). is fixed to the pace (2) with screws αe, a?). (13b) is an arc runner and is electrically connected to fixed contact 0, but it may also be integrated with fixed contact 3. α barrel is a terminal screw connected to the main circuit wire, and the terminal (Is The arc box α is made of an insulating material and is fixed to the base (2) by screws (1). 19a), a ceiling part (191)), and a side plate (19C).C
11) is a de-ion grid made of a magnetic material and has a shape as shown in FIG. 4, and (2) is a commutating electrode fixed to the ceiling (i9b) of the arc box a. Possible
, the moving contact (11a) and the fixed contact (13a) are arranged in the arc extinguishing chamber.

Next, the opening/closing operation of this power switching device will be explained. When the main circuit shown in Fig. 1 is open, when a voltage is applied to the operating coil (5), a magnetic flux is generated between the fixed iron core (4) and the movable iron core (7), and the trip spring α The movable iron core (7) resists the urging force of the groaning force and the fixed iron core (4)
is adsorbed to. At this time, the crossbar (8) connected to the movable iron core (7) operates in the same manner, and the movable contact (11a) of the movable resuscitation contact U comes into contact with the fixed contact (13a) of the fixed contact I. A predetermined pressure is applied by the pressure spring (2), and the main circuit is closed. Next, when the operating coil (5) is demagnetized, the movable core (7) moves away from the fixed core (4) due to the urging force of the tripping spring α1, and the crossbar (8) also moves in conjunction with the movable core (7). and move. Therefore, the crossbar (8) of the i/zen1 lever returns to the state shown in FIG. 1, and the movable contact (11a) of the movable contact I and the fixed contact (t3a) of the fixed contact - is released.

At the time of this separation, the movable contact (11a) and the fixed contact (
13a), an arc is generated at the part indicated by the middle figure in FIG. The movement of the arc from the time the arc occurs until the current is cut off will be explained using FIG. The arc extinguishing chamber in Figure 1 is symmetrical, so only one side of it is
As shown in the figure. Figure 5(a) shows the fixed contact (13a)
and shows the state in which the movable contact (11a) is closed. When the operation coil (5) is energized, the fixed contact (13a) and the movable contact (
When 11a) is opened, the fixed contact (13a) and the movable contact (11a) are opened.
An arc (c) is generated between &) as shown in FIG. 5(b). The contact separation distance increases over time up to a certain distance. This arc (to) is the current flowing through the movable contact αυ and the fixed contact and the deion grid cl])
The arc (
One end of 2) is connected to a fixed contact (13) as shown in Figure 5(d).
It is transferred from the surface of a) to the arc launch (13b).

Next, dielectric breakdown occurs between the tip of the arc (2) shown in FIG. 5(d) and the part indicated by B of the arc runner (13b), and one end of the arc 4 is connected to the arc runner shown in FIG. 5(e). It metastasizes to the part shown by B in (13b), and Fig. 5(f)
As shown in , the other end of the arc (to) is connected to the fixed contact (11
The arc (c) is transferred from a) to the commutating electrode (2) and
is attracted during the deion grid QrJ and is extinguished.

This arc extinguishing completes the interruption.

In such a power switchgear, one end of the arc (to) easily attaches to the end of the fixed contact (13a), and the other end of the arc (c) easily attaches to the surface of the movable contact (11a), so the fixed contact is expensive. (13a) and the movable contact (11a) are consumed a lot, and the arcing time is long (as a result, the arc energy becomes large and a large current cannot be cut off).

This invention reduces wear and tear on the movable contacts.

The purpose is to improve cutting performance.

The power switching device of the present invention is the same as that shown in FIGS. 1 to 4 except that the shape of the commutating electrode is different. (4)) in the embodiment of the present invention is the hollow part of the commutation electrode (c), (N)
is a flat part of the commutation electrode (2), which is configured to face the deion grid.

The shape of the current electrode is shown in FIG. Figure 6(a) shows half of the commutating electrode, and since it is symmetrical,
The other half has the same shape ~ this commutation electrode (2)
A-A, B-B, C-C! It is finished in the shape shown in FIG. 6(a) by bending it along the lines shown in FIG.

Since the commutating electrode slope has a certain thickness, when bent,
As shown in FIG. 6(a), a hollow portion M2 is formed in a part of the grid-facing surface N of the commutation electrode.

The height of the hollow portion M2 is represented by H in FIG. 6(a). The commutation electrode (2) is constructed so that the movable contact αυ can fit into the notch of the commutation electrode (2), as shown in FIG. 6(a).

The movement of the arc in the power switchgear according to the present invention will be explained using FIG. In Figure 7, the arc is at point 0 in Figure 6.
It is a diagram showing the movement of the arc when it occurs in the 0 part, i
T diagram (aj is fixed contact (13a) and movable contact (11a)
indicates the closed state. When the fixed contact (13a) and the movable contact (11a) are opened while the operation coil (5) is energized, there is a gap between the fixed contact (13a) and the movable contact (11a) as shown in FIG. 7(b). Generates an arc (c). The contact separation distance increases to a predetermined value over time. When the contact separation distance becomes larger than the shortest distance between the fixed contact (13a) and the commutating electrode slope, one end of the arc (c) moves from the movable contact (11a) to the commutating electrode @ as shown in FIG. 7(C). metastasizes to. When the arc ■ transitions, as shown in Figure 8, a strong magnetic field as shown in Figure 6 B acts on the arc due to the current flowing through the movable contact (lI) and the magnetic commutating electrode @, and at this time Driving force F is generated and A” -ri (
2) is strongly driven, and the arc is transferred from the movable contact (11a) to the commutating electrode as shown in FIG. 7(C). The transition of this arc (c) is quickly performed by the driving force F and the shape of the transition electrode. And arc (2
) is driven and expanded as shown in Figure 7(d) by the current flowing through the commutating electrode (2) and fixed contact α1, and as shown in Figure 1(6).
The arc is extinguished between the de-ion grids as shown in FIG. 7(f). With this arc extinguishing, the interruption is completed.

By the way, in the power switchgear of the second invention, FIG.
), when the movable contact (11a) is fully opened, the distance from the surface of the fixed contact (13a) to the side Q of the grid-facing surface N of the commutating electrode (c) (see Figures 6(a) and (b)) The distance G2 is the distance G between the surface of the fixed contact (13a) and the back surface of the movable contact aυ (facing the surface on which the movable contact is attached).
It is configured to be smaller than 1. Because of this configuration, in FIG. 6(a), the movable contact (1
When an arc occurs at point P, which is the center of 1a), the arc is at the center of side R of commutating electrode (2). It is driven in the direction of point q, the foot of the arc quickly moves from point P of the movable contact (11a) to point Q of the commutating electrode @, and is extinguished by grid 0υ. If G2 is greater than 01, it takes a longer time for the arc leg to reach point P of the movable contact (11a), which not only increases wear on the movable contact (11a), but also lengthens the arc time, resulting in a decrease in arc energy. becomes large, making it impossible to obtain excellent breaking performance. On the other hand, in the present invention, G2 is configured to be smaller than 01, so as mentioned earlier, the time for the arc leg to land at point P of the movable contact (11a) is short, so that the arc is at the firing position. Regardless, it is possible to reduce the consumption of the movable contact and improve the breaking performance.The above embodiment is an application of the present invention to a power switching device, that is, an electromagnetic contactor, which performs switching operations using a magnet. It goes without saying that the invention can also be applied to other electromagnetic switching devices such as circuit breakers.

According to the invention described above, a commutation electrode.

By specifying the distance between the movable contact and the fixed contact, it is possible to improve the breaking performance of the electromagnetic switching device.

[Brief explanation of drawings]

@1 Figure is a sectional view showing a conventional power switchgear. Figure 2 is a side view of the device in Figure 1, Figure 4 is a plan view of the device in Figure 1, Figure 4 is a perspective view of the deion grid in Figure 1, and Figure 5 is a conventional power switch. An explanatory diagram showing the arc extinguishing chamber part of the device and the movement of the arc. FIG. 6 is a structural diagram showing an embodiment of the present invention, and FIG. T is an explanatory diagram showing the arc extinguishing chamber portion of the power switchgear according to the present invention and the movement of the arc. In the figure, αυ is a movable contact t (11a) is a movable contact, α moat is a fixed contact, (13a) is a fixed contact,
(13b) is an arc runner, Qυ is a deion grid, a2 is a commutation electrode, and (c) is an arc. In addition, in FIG. 9, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno − 186= Rate 3 Affair 4 ρ 1,! 5 colors'#/8 (+2)'! 7 ((1) Question d Mr. Commissioner of the Japan Patent Office) Display of the case Tokuhan Sho Kito → No. 2/2I No. 2
Title of the invention: Electromagnetic switchgear 3, Person making the amendment Detailed description of the invention in the specification to be amended a Contents of the amendment (1) Page 8 of the specification, line 7, before "When transferring" to "
The arc is driven by the magnetic field created by the current flowing through the movable contact I and the fixed contact AS, but if a magnetic material is used as the commutation plate, insert ". (2) On page 8, line 11 of the same, the phrase ``strongly driven'' is corrected to ``even more strongly driven.'' (3) On page 9, line 10 of the same, the phrase ``At the center. Point Q'' is corrected to ``At the center, at point Q.'' (4) Same, page 9, line 14 and page 10, line 1 K.
The phrase "time to reach a stalemate" should be corrected to "time to reach a stalemate."that's all

Claims (1)

[Claims] A fixed contact joined to a fixed contact fixed to a base, a movable contact joined to this movable contact and provided opposite to the fixed contact, and a dea provided in a direction perpendicular to the surface of the fixed contact. an ion grid, having a surface facing the dea ion grid and a surface facing the surface of the fixed contact, having a hollow portion into which at least a portion of the movable contact can fit, and being continuous with the hollow portion at the surface facing the dea ion grid; In an electromagnetic switchgear equipped with a commutating electrode having a hollow part, a fractured surface formed in a hole having a hollow part on a surface of the commutating electrode facing the deion grid, the part facing the surface of the fixed contact. The vertical distance (G2) from the surface to the surface of the fixed contact is smaller than the vertical distance (G1) from the opposite side of the surface to which the movable contact is attached of both surfaces of the movable contact to the surface of the fixed contact. An electromagnetic switchgear characterized by: