JPS5998414A - Power 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 power switch, and relates to an improvement in each contact that is connected to a movable contact and a fixed contact in order to prevent them from peeling off due to arcing. It is.

The conventional electromagnetic switch for this building has the configuration shown in Figure 1. That is, in FIG.

(1) shows an arc box for arc extinguishing made of a heat-resistant material, in which an arc extinguishing plate (21) and a commutation plate (3) made of a magnetic metal are arranged and fixed in accordance with the number of phases of the electrical circuit to be opened and closed. (4) is a crossbar 0 (5) is a movable contact.

(6) is a movable contact attached to both ends of the movable contactor (5).

(7) is a moving contact foot presser, (8) is a presser spring support, (9
j is a contact spring, and QO) is a stopper. The contact spring L9r is compressed and fixed between the lower part of the stopper (10) and the lower end of the presser spring support (8), and is compressed and fixed between the upper end of the presser spring support (8) and the movable contact holder (7). The upper surface and the upper surface of the movable contact (5) and the lower surface of the movable contact holder (7) are set in close contact with each other. Further, the stopper 00 is inserted into the stopper hole (4) of the cross bar (4). αl indicates a base and has an open bottom shape, and is further provided with an opening for drawing out an electromagnetic drive device to be described later. (not shown) on the side.Q21 has base 01
), (131 is the terminal +
This is a U-shaped fixed contact screwed onto the top surface of 121, and a fixed contact (141) is attached to the top surface.

Arc runner fixed to 051 (main fixed contact 03).

Port 0 is an insulating barrier, which serves as electrical insulation between the terminals O2, and a part of it is inserted into a groove (not shown) provided in the arc box (1) and the base aυ to connect both terminals. It is fixed between. (171 is 1liT dynamic shock absorbing rubber, (1g is a movable iron core and is connected and fixed to the lower part of the crossbar (4) by +aT dynamic iron core pin C. (L'l
1 indicates a fixed core, which is arranged to face the movable core (2) with a predetermined gap. ■ indicates an electromagnetic drive control device (hereinafter referred to as the drive control device), which is inserted through the fixed iron core f11, and contains a magnetic flux generating device (211) such as an electromagnetic coil. There is. (
Reference numeral 22 is a fixed buffer (spring) which is attached to the lower part of the fixed iron core (9) and serves as soil to reduce the impact on the mounting board surface (not shown) when an electromagnetic contact is applied.

Q4 indicates a fixed iron core bottle, which is provided through the lower part of the fixed iron core α9, and its both ends protrude from the fixed iron core (19).
41 is included. The ratchet +-a (A) is held in the vertical convex part of the drive control device 4 so that the ratchet recess can move up and down, and is further biased downward by a return spring (251). A locking protrusion (24b) is formed. (A) is a mounting plate.

It has a mounting hole for mounting the electromagnetic contactor inside the mounting board (not shown), and is fixed with screws to the underside of the rail plate (not shown). The arc box (1) is fixed to the base OD by screwing, and the cross bar (4) is held and guided by the inner wall of the base I so as to be vertically movable.

This conventional electromagnetic switch is configured as described above.
Next, the operation will be explained.

In Figure 1, 1. When a drive voltage is applied to the drive control device, an electromagnetic attraction force is generated between the movable iron core 08i and the fixed iron core α9 due to the magnetic flux generated by the drive control device (■).
The crossbar (4) connected to the movable iron core Ua moves downward against a tripping spring (not shown).

The movable contact (6) and the identification contact I come into contact. Movable contact (6
) and the identification contact α3, the core gap between the movable core 0 and the fixed core 09 is larger than the contact gap between the movable core 0 and the fixed core 09. The iron core is closed by moving further downward. Therefore, the contact spring L9i is compressed and deformed.

This spring pressure is applied to the presser spring support (8) and the movable contact holder (
7) is transmitted to the movable contactor (5), and with a predetermined contact pressure, the terminal (121) and the terminal Q3 on the opposite side forming the same electrical path are electrically connected.

When the drive voltage applied to the drive control device CQ is removed, the electromagnetic attractive force between the movable core 0& and the fixed core α9 disappears, and the crossbar (4) is moved by the compressed trip spring (not shown). The contacts are moved upward by the biasing force, and the contacts are separated. At this time, the movable contact (6) and the fixed contact (141
An arc is generated between them, and the legs of this arc are movable contacts (
61 to the commutator plate (3), 1 and the fixed contact a4+ to the arc runner (L51).

Furthermore, it is drawn into the arc extinguishing plate (2) by the electromagnetic repulsion force caused by the arc current and the contact current, and the arc is extinguished by being cooled and cut off.

As described above, the electric circuit connected between the terminals (121o) is opened and closed by opening and closing the drive voltage of the drive control device.

By the way, in a conventional electromagnetic switch that performs such opening/closing operations, the aJ moving contact 5) has a shape as shown in an enlarged view in FIG. In other words, 0T shift contact (5)
was in the shape of a flat plate, and the movable contact (6) was joined to the surface optical end (5B) of the movable contact (5) opposite to the fixed contact α4 with a brazing material.

Therefore, when the foot of the arc generated at the movable contact (6) moves to the tip (5B) of the movable contact (5), the foot of the arc passes through the contact joint. As shown, the brazing material that joins the contact (6) and the contactor (5) is melted, making the movable contact (6) easy to separate.

This peeling has the disadvantage that its progress speed increases as the opening and closing operations are repeated many times. Similarly, the fixed contact aa joined to the fixed contact (131) also had the disadvantage of being easily peeled off by arcing.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional ones, and includes a step on at least one of the opposing surfaces of the fixed contact and the movable contact in the contact/separation direction and with the tip thereof protruding. and forming a cage part in the step part of this step,
The purpose of this is to prevent the contacts from peeling off by fitting the contacts into this cage and joining them.

An embodiment of the present invention will be described below with reference to the drawings. Fourth
The figure shows an example in which the present invention is applied to a movable contact (5), in which a step is provided in the movable contact (5) in the contact/separation direction, a stepped portion (5A) of this step is formed, and the movable contact ( 6+ is fitted into this part and joined.This part 9 is provided on the side where the arc is driven.In this way, the tip part (5B) of the oJ working contact 5) is movable. Since it covers the joint on the arc drive side of the contact (6), the arc
Since the joint part of the T-moving contact (6) on the arc drive side IA is not touched, peeling of the contact (61) is extremely difficult to occur.
Since it is fitted and connected to the cage provided in A), the movable contact +6! Even if a bending stress that causes peeling occurs, peeling will not occur because the stepped portion (5A) of the movable contactor (5) is held down by the stamen portion. Furthermore, in this invention, since the tip (5B) of the movable contact (5) protrudes in the direction of contact and separation of the contact (61), the legs of the arc are easily transferred from the movable contact (6) to the movable contact (51). Therefore, wear and tear on the movable contact (6) can be significantly reduced.

FIG. 5 shows an example in which the present invention is applied to a fixed contact (131).The fixed contact 131 has the same side as in FIG. 4, where the arc of the fixed contact a is driven.

Its tip (13B) protrudes so as to cover and protect it, and a cap is formed on its step (13A).

For the same reason as in the case of the movable contact (5) in Fig. 4, peeling on the fixed contact side can be prevented, and the contact fi41
consumption can be reduced.

By the way, in both of the embodiments shown in FIGS. 4 and 5 described above, a step is provided in such a way that the tips of the 5T@contactor (5) and the fixed contactor (13) are internalized. For example, the movable contact (5) as in the other embodiment shown in FIG.
Of course, it is also possible to apply pressure to the tip (5B) of the movable contact (5B) to cover and protect the side surface of the movable contact (6) in the direction in which the arc is driven.

I cut it. As shown in FIG. 7, a cover portion (50) is provided on at least one of the opposing surfaces of the solid contacts +51 and +131,
A cap is provided on the side surface (5A) of the end of this cap.

The contact (6) may be fitted into this casing for connection.

In the above embodiments, the present invention is applied to an electromagnetic contactor, but it goes without saying that the present invention can also be applied to other power switches such as circuit breakers.

As described above, according to the present invention, at least one step is provided on the facing surfaces of the fixed contact and the movable contact in the direction of the 5 VC contact/separation force and the tip of the step protrudes, and the step portion of the step is provided. Since a portion is formed and the contact is fitted into the casing portion and bonded, it is possible to prevent the contact from peeling off.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a conventional electromagnetic contactor. 2 is an enlarged side view showing the movable contact shown in FIG. 1, FIG. 3 is an enlarged side view illustrating the state of peeling of the movable contact shown in FIG. 2, and FIG. 4 is an embodiment of the present invention. by 151il$
FIG. 5 is an enlarged side view of a fixed contact according to one embodiment of the present invention, and FIGS. 6 and 1 are movable contacts according to other embodiments of the present invention. FIG. 4 is a side view showing the child with tl and '+ enlarged, respectively. In the figure, (5) is the movable contact, (5A) is the stepped part of the movable contact (5), (5E) is the tip of the movable contact (5), (6) is the movable contact, and +131 is the fixed contact. Child, +13
A) is the fixed contact 00 step part, (13B) is the tip of the fixed contact (131).■ is the fixed contact.In addition, the same reference numerals in Figure 1 indicate the same or equivalent parts. Shin Kuzuno - Figure 1 @ Figure 2) Figure 3 Figure 4

Claims (1)

[Claims] t[I A fixed contact joined to a fixed contact, and a movable contact joined to a movable contact and capable of coming into contact with and separating from the fixed contact, wherein the fixed contact and the movable contact A step is provided in the approaching/separating direction at least for the power on the opposing surface. A power switch characterized in that a cap is formed in the stepped portion of the step, and the contact is fitted into and connected to the cap. (2) The power switch according to claim 1, wherein the contact and separation surfaces of the contacts protrude from the opposing surfaces of the contacts.