JP2580919Y2 - Electromagnetic relay - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay, and more particularly to an electromagnetic relay having an improved structure of a fixed terminal having a fixed contact.

[0002]

2. Description of the Related Art A conventional electromagnetic relay includes a coil block having a coil and an iron core, a movable contact block having an armature and a movable contact spring disposed thereon.
And an insulator base provided with fixed contacts and the like.

For example, in a movable contact spring block, a movable contact spring having a movable contact and a hinge spring portion is arranged on both sides of an armature, and is integrally formed by an insulating fixed body.
The coil block is wound around a coil spool made of an insulator with a U-shaped iron core and coil terminals embedded in it, and a permanent magnet is fixed in a permanent magnet insertion hole provided in the central part inside the iron core. It is formed. Further, the insulator base is formed by burying a fixed terminal to which a fixed contact is fixed, a neutral terminal, and a coil lead-out terminal in a box-shaped insulator having an open upper side.

In assembling such an electromagnetic relay, a coil block is fitted and fixed inside an insulator base, and a coil terminal and a coil lead-out terminal are connected by a method such as welding. Further, the mounting of the movable contact spring block is performed by fixing the hinge spring portion and the neutral terminal, and finally, the cover or the case is mounted to complete the mounting. In addition, a projection (not shown) serving as a fulcrum for tilting the movable contact spring block is provided at the lower center of the armature, and is in contact with the upper surface of the permanent magnet.

FIGS. 5 (a) and 5 (b) are perspective views respectively showing an example of a conventional electromagnetic relay before and after mounting a fixed terminal in an electromagnetic relay.

As shown in FIG. 5 (a), a fixed terminal 7 in a conventional electromagnetic relay fixes a fixed contact 6 on an upper surface, and furthermore, in the same plane, a tongue embedded in the insulator of the insulator base. A piece 23 is formed. Next, as shown in FIG. 5B, the fixed terminal 7 is embedded in the insulator 5. In short, the fixed terminal 7 is a tongue piece 2 extending inside and outside the same plane.
The same tongue piece 23 is embedded and fixed in the insulator 5 to integrally form the insulator base. The insulator 5 is formed so as to protrude in a bank shape on both sides of the fixed terminal 7 around the fixed contact 6.

[0007]

In the above-described conventional electromagnetic relay, the insulator for fixing the fixed terminal is close to the fixed contact and protrudes from the fixed contact.
When a surge voltage or current of W or more is cut off, the fixed contact and the insulator near the fixed terminal are melted by the heat of the arc discharge generated at the time of contact opening, and the atmosphere near the contact is activated. There is a drawback that it is rapidly lowered. Further, when the AC voltage and the current are cut off, dielectric breakdown of both positive and negative polarities is continuously repeated, and finally, the movable contact spring and the fixed terminal are melted by arc heat.

An object of the present invention is to provide an electromagnetic relay capable of preventing such continuous dielectric breakdown and improving the withstand voltage between contacts.

[0009]

The electromagnetic relay according to the present invention is:
A coil block body in which a coil is wound around a coil spool in which a U-shaped iron core and a coil terminal are integrally formed of an insulator, and a permanent magnet disposed in a central portion of the U-shaped iron core,
An armature arranged such that both ends of the armature face each other at both ends of the core, a hinge spring portion that supports a tilting movement in which both ends of the armature come into contact with and separate from both end surfaces of the core, A movable contact spring block in which a movable contact spring having a movable contact at the tip in conjunction with the tilting movement is integrally formed with an insulating fixed body, and a fixed contact disposed opposite to the movable contact is provided at an upper part and a part thereof is provided. wherein the fixed contact and the fixed terminal comprising a tongue piece bent in the opposite downward, neutral terminal connected to one end of the hinge spring portion, integrally implanted coil lead terminal connected to the coil terminals to the insulator and a molded insulator base, the lower surface of the fixed pin is in contact with the insulator base, the said tongue is embedded in the insulator of the insulator base DOO
In addition, the entire surface of the upper surface of the fixed terminal is exposed .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an electromagnetic relay for explaining the outline of the present invention. As shown in FIG. 1, the electromagnetic relay according to the present invention has a movable contact spring 17 having a movable contact 18 and a hinge spring portion 19 disposed on both sides of an armature 16 and integrally formed by an insulating fixed body 15. Block 3, U-shaped iron core 12 and coil terminal 1
A coil block body 2 for winding a coil 11 around a coil spool 10 made of an insulator embedded with a coil 3 and fixing a permanent magnet 4 to a magnet insertion hole 14 provided at a central portion inside a core 12 and a fixed contact 6 are fixed. Fixed terminal 7, neutral terminal 8
And an insulator base 1 in which the coil lead-out terminal 9 is embedded in a box-shaped insulator 5 having an open upper side. In assembling such an electromagnetic relay, the coil block 2 is fitted and fixed inside the insulator base 1, and the coil terminal 13 and the coil lead-out terminal 9 are joined by a method such as welding. Further, the mounting of the movable contact spring block 3 is performed by fixing the hinge spring portion 19 and the neutral terminal 8, and the cover is finally mounted to complete the operation. In addition, a projection (not shown) serving as a fulcrum for supporting the tilting movement of the movable contact spring block 3 is provided at the lower center of the armature 16, and is in contact with the upper surface of the permanent magnet 4.

FIGS. 2 (a) and 2 (b) are perspective views of the electromagnetic relay shown in FIG. 1 before and after mounting the fixed terminals, respectively, for explaining the first embodiment of the present invention. As shown in FIGS. 2A and 2B, the present embodiment differs from the above-described conventional example in the shape of the tongue piece 20 provided on the fixed terminal 7. That is, the tongue piece 20 in FIG.
Cuts out a part of the fixed terminal 7 and bends it downward by 90 degrees. In addition, the insulator base 1 in FIG. 2B is obtained by integrally molding the tongue piece 20 so as to be embedded and fixed in the insulator 5. The fixed terminal 7 for extending the tongue piece 20 downward and burying it inside the insulator 5 does not protrude from the fixed contact 6 by the insulator 5. Further, since the insulator 5 is not disposed near the fixed contact 6, the insulator 5 is not melted by arc heat. Therefore, activation of the atmosphere due to melting of the insulator 5 cannot occur, and continuous insulation breakdown does not occur. Moreover, since the insulator 5 does not cover the fixed terminal 7, the area of the fixed terminal 7 can be increased, and the proof strength (withstand voltage) against arc heat increases. The bending angle of the tongue piece 20 is not limited to 90 degrees.

FIGS. 3 (a) and 3 (b) are perspective views respectively showing a second embodiment of the present invention before and after the fixed terminals of the electromagnetic relay shown in FIG. 1 are mounted. As shown in FIGS. 3A and 3B, the present embodiment is different from the above-described first embodiment in that a tongue piece 21 provided on the fixed terminal 7 extends outside the fixed terminal 7. And bent it 90 degrees downward. Note that this embodiment can also exhibit the same effects as the above-described first embodiment, and the bending angle is not limited to 90 degrees.

FIGS. 4 (a) and 4 (b) are perspective views respectively showing a third embodiment of the present invention before and after the fixing of the fixed terminals in the electromagnetic relay shown in FIG. As shown in FIGS. 4A and 4B, this embodiment is different from the above-described second embodiment in that the tongue piece 22 provided on the fixed terminal 7 is pressed downward by a half-cutting method by press working. 2 and FIG. 3 and exerts the same effect as the tongue piece of FIG. 2 and FIG. In this embodiment, the shape, position or size of the tongue piece is not limited to the illustrated one.

[0015]

As described above, the electromagnetic relay of the present invention has a fixed terminal provided with a tongue extending partly downward and burying the tongue in the insulator of the insulator base. Since the insulator does not protrude from the fixed contact and the insulator does not need to be arranged near the fixed contact, the insulator is not melted by arc heat, and the atmosphere is not activated by the insulator melting. This has the effect of preventing continuous dielectric breakdown. In addition, since the insulator does not cover the fixed terminal, the area of the fixed terminal can be increased, the resistance to arc heat can be increased, and a surge voltage and current of 2500 W or more can be cut off.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay for explaining the outline of the present invention.

FIG. 2 is a perspective view showing a first embodiment of the present invention before and after the fixing terminal shown in FIG. 1 is attached.

FIG. 3 is a perspective view showing a second embodiment of the present invention before and after the fixing terminal shown in FIG. 1 is attached.

FIG. 4 is a perspective view showing a third embodiment of the present invention before and after the fixing terminal shown in FIG. 1 is attached.

FIG. 5 is a perspective view of an electromagnetic relay for explaining an example of the related art before and after a fixed terminal is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator base 2 Coil block body 3 Movable contact spring block 4 Permanent magnet 5 Insulator 6 Fixed contact 7 Fixed terminal 8 Neutral terminal 9 Coil lead-out terminal 10 Coil spool 11 Coil 12 Iron core 13 Coil terminal 14 Magnet insertion hole 15 Insulation fixed Body 16 Armature 17 Movable contact spring 18 Movable contact 19 Hinge spring part 20, 21, 22 Tongue piece

Claims (4)

(57) [Scope of request for utility model registration] 1. A coil block body in which a coil is wound around a coil spool in which a U-shaped iron core and a coil terminal are integrally formed of an insulator, a permanent magnet disposed at a central portion of the U-shaped iron core, and both ends of the iron core The armature is arranged such that both ends of the armature are opposed to each other, a hinge spring portion that supports a tilting movement in which both ends of the armature come into contact with and separate from both end faces of the iron core, and is linked with the tilting movement of the armature. A movable contact spring block having a movable contact spring having a movable contact at its tip is integrally formed with an insulating fixed body, and a fixed contact disposed opposite to the movable contact is provided above and a part of the fixed contact is provided on the opposite side to the fixed contact. br /> a fixed terminal provided with tongues bent downward, neutral terminals, the insulator base molded integrally planted on the insulator coil lead terminal connected to the coil terminals to be connected to one end of the hinge spring portion With the table Look, the lower surface of the fixed terminals the insulator
In contact with the base, the tongue is embedded in the insulator of the insulator base and the entire upper surface of the fixed terminal is exposed.
Electromagnetic relay, characterized by that. 2. The electromagnetic relay according to claim 1, wherein the tongue is formed by notching and bending a part of the fixed terminal downward. 3. The electromagnetic relay according to claim 1, wherein the tongue extends outward from the fixed terminal and is bent downward. 4. The electromagnetic relay according to claim 1, wherein the tongue piece is formed by extending a part of the fixed terminal downward by a half-cut method by press working.