JPS62219416A - 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 [Industrial Application Field] The present invention relates to a switch KIS1 that switches on and off an electric current.

[Conventional technology]

As the main applicable switch of this invention, electric@contactor, IT
s relay, 11e? The IM breaker etc. can be opened.

First, an example of a conventional 1tim contactor shown in FIG. 8 (Patent Publication No. 59-90327) will be described. Traditional[
& Since the contactor is symmetrical, Figure 8 shows only one side of it.
Shown in yr plane. In the figure, (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 core (4), which is laminated with silicon steel plates, provides a driving force that attracts the movable core (3) and the fixed core (2) against a tripping spring (not shown). The operating coil (5) is a crossbar made of plastic and having a square window, at its lower end the movable core (3)
is held. (61 is a movable contact inserted into the corner window of the cross bar 151 and held down by a pusher (7), (6A) is a movable contact provided on the movable contact +61, (8+ is a movable contact A fixed contact element (8A) is provided opposite to the child (6) and conducts the N flow, and (8A) is a fixed contact element provided with this fixed contact element 181K.
Similarly, reference numeral 80) indicates the terminal portion of this constant contactor (81).

Therefore, (9I is a terminal screw for connecting the tm contactor main body with an external circuit, a. is a fixed contact (81 mounting pace, fil is 1 [set contactor top surface is A15 cover, 1 example is polyester 1tj3 ) and phenolic resin.

In addition, the movable contact (61) is connected to the movable contact (6A).
The fixed contacts (81) to which the fixed contacts (8A) are connected are arranged in parallel according to the number of phases, and are bordered from each other by the cover OK.

Because it has the above configuration, in this conventional electromagnetic contactor, when the &1 working coil +41 is demagnetized, the movable core +3) is separated from the fixed core (2) by a tripping spring (9) not shown, and the crossbar (51) is also separated from the fixed core (2). In the state shown in Figure 8, the fixed contact (8A) and the movable contact (6A) open and an arc a is generated between the fixed contact (8A) and the movable contact (6A). When the arc is extinguished at the current zero point and the current is cut off, it becomes K.

[The gap that the invention attempts to solve]

Conventional switches are constructed and operated as described above, but when the electric power is cut off many times, the cover fill is damaged by arc heat, and a hole is formed in the cover A9, causing a mutual short circuit. .

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a K-pipe switch in which the cover is less damaged even when the current is interrupted many times, thereby causing correlated short circuits.

[Means for solving problems]

The switch according to the present invention includes a fixed contact joined to a fixed contact, a movable contact that is movable on a movable contact and can be brought into contact with the fixed contact, a cover that accommodates the movable contact, and this cover and the above-mentioned A metallic cover retaining member 1a is provided between the movable contacts so as to accommodate the movable contacts.

[Effect]

The cover preservation member of the present invention is designed so that the cover with a high thermal Km comes into contact with the arc, and at the same time absorbs the arc heat and lowers the temperature of the gas in the arc extinguishing chamber, so that the cover does not easily deteriorate due to heat. This prevents dust particles from forming holes in the cover and causing correlated short circuits even if the current is cut off many times.

[Embodiment] ・ □ Hereinafter, an embodiment of the present invention will be explained based on the drawings.Since the switch according to the embodiment of the present invention is similar to the conventional one shown in Fig. 8, the main details will be explained below. Differences! I will mainly explain. Figure 1 shows an example of a switch according to an embodiment of the present invention.
It is a front view which expands and shows S. In the figure, a3 is a metallic cover retaining SS piece between the cover and the movable contact +61, and a perspective view thereof is shown in FIG. In this example, the cover maintenance material a3 is 11
It is a rectangular parallelepiped box made of magnetic gold M4&C, such as iron of a grade III rhinoceros, and consists of five sides with -11D (15A) removed.

Next, the operation will be explained. When the movable contact (6) is opened from the fixed contact (8), one contact (6A), (8A)
), but this arc υ is attracted by the magnetic material's cover and becomes like 7-ri (12A), and is extinguished at the current zero point. At this time.

Cover protection 1!1 Due to the presence of member a3, the thermal &C# cover (not shown) made of polyester resin or phenol resin will not receive direct thermal damage from the arc @L (12A) and will not be extinguished. Although the inside of the arc chamber is cooled by a metal cover retainer with good thermal conductivity, the high-temperature arced gas is blown onto the cover, and even if the current is cut off many times, holes will form in the cover. It is possible to suppress the phenomena that cause mutual short circuits.

FIG. 3 is a front view showing important parts of a switch according to another embodiment of the present invention, and FIG. 4 is a perspective view showing a cover retainer used in FIG. 3. In this example, a fixed contact (81) and a metal tongue (13C) facing the open end (13B) are repeatedly thrown at the open end (13B) of the cover protection member a3, and a contact (6A
), (8A) The arc (13 is.

The arc (12A) between the tongue (13C) and the fixed contact (8) is attracted by the cover protection member α3 and passes through the arc (12A).
B) becomes a trap and the arc is extinguished. As shown in the example in Fig. 1, the arc is extinguished at the open end (13B) of the cover MS material 0, which has poor heat conduction and is prone to electric field concentration.
3C) has good heat conduction and electric field concentration is less likely to occur, so the breaking performance can be further improved.

Note that the cover protection member a3 is K as shown in FIG.

The tongue 5 (15C) may also be formed by pressing a single metal plate.

@Figure 6 is a perspective view showing a cover protection member according to yet another embodiment of the present invention, and in this example, the tongue! (13C) and the fixed contact (not shown) is configured such that the distance between the fixed contact (not shown) increases as the distance from the fixed contact (not shown) increases. In this case, the arc is the tip of the tongue Th (13D) K
The arc is quickly extinguished without any notice.

In each of the above embodiments, the case where the cover hs retaining material 0 is made of magnetic metal is explained, but as shown in FIG. If the arc fiz is driven by the magnetic field trap created by the current flowing through the fixed contact (8), the cover protection member (13) does not necessarily have to be made of a magnetic metal. The same effect as in the above embodiment can also be obtained when the structure is formed using the above-mentioned structure.

In addition, even if the fixed contact (81) is not U-shaped, if the distance between the cover retainer W11 member housing 3 and the fixed contact (81) is shorter than the fully open distance between the fixed contact (8A) and the movable contact (6A). There is an arc t generated between the 9 contacts (6A) and (8A).
12 becomes an arc (12B) and extinguishes the arc (12B) without passing through the state of the arc (12A) shown in Figure 1 due to the dielectric breakdown phenomenon, so the cover retainer *Th4113 is not necessarily made of magnetic metal. It's okay.

Furthermore, the fixed contact +151 is formed into a U-shape.

Cover Horon Jizaizumi 3 and fixed contact +81 r&! ] is configured to be shorter than the fully open distance between the fixed contact (8A) and the movable contact (6A), and the cover protection member 113 is made of magnetic metal,
).

(8A) It is clear that the residence time can be further shortened.

Furthermore, in the above embodiments, the case where the cover retainer IIs material 0 is in the shape of a rectangular parallelepiped has been described.9 For example, it may be shaped like a hemisphere or a cap with rounded corners, and the same effects as in the above embodiments can be obtained. can get.

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 switches such as electromagnetic relays and circuit breakers.

〔Effect of the invention〕

As described above, according to the present invention, a fixed contact joined to a fixed contact, a movable contact joined to a movable contact and capable of coming into and out of contact with the fixed contact, a cover housing the movable contact,
and a metallic cover retainer h1f1 arranged between this cover and the movable contact so as to accommodate the movable contact.
Because it is equipped with 1m.

Even if the current is repeatedly cut off many times, there is little thermal damage to the cover, and therefore short circuits occur between phases, resulting in a K-pipe switch.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the main parts of a switch according to an embodiment of the present invention, FIG. 2 is a perspective view showing the cover protection member of FIG. 1, and FIGS. FIG. 4 is a configuration diagram showing the main parts of the switch according to the embodiment, and FIG. 4 is a perspective view showing the cover protection member of FIG. 3. FIGS. 5 and 6 are perspective views showing cover protection members according to other embodiments of the present invention, and FIG. 8 is a semi-spherical sectional view showing a conventional switch. In the figure, (61 is a movable contact y (6A) is a movable contact, (81 is a fixed contact, (8A) is a fixed contact,
aυ is cover, C1B, (12A), (12B)
7-ri, +13 bar force @ member, (15B)
The open end t (130) is a tongue. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (5)

[Claims] (1) A fixed contact joined to a fixed contact, a movable contact joined to a movable contact and capable of coming into and out of contact with the fixed contact, a cover that accommodates the movable contact, and between the cover and the movable contact the A switch equipped with a metallic cover protection member arranged to accommodate a movable contact. (2) The switch according to claim 1, wherein the distance between the cover protection member and the fixed contact is shorter than the distance between the fixed contact and the movable contact when fully open. (3) The switch according to claim 1 or 2, wherein a metallic tongue portion facing the fixed contact is connected to the open end of the cover protection member. (4) The switch according to claim 3, wherein the distance between the tongue and the fixed contact increases as the distance from the fixed contact increases. (5) The switch according to any one of claims 1 to 4, wherein the cover protection member is made of magnetic metal.