JPH05314883A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To easily and effectively shield magnetic flux leaking to the outside by forming a cover from a material formed by mixing of a filler made of magnetic substance into plastic base material, and covering an electromagnetic relay main body with the cover. CONSTITUTION:An electromagnetic relay comprises a coil block body having a coil wound to a U-shaped iron core, a movable contact spring block including an armature and a movable spring, etc., an insulator base for storing the blocks, and a plastic cover. The cover 161 is made of a material formed by mixing of a filler 161a made of magnetic substance into plastic base material 161b. Or the cover 161 is formed by an inner cover formed by mixing of the filler 16a made of magnetic substance into the plastic base material 161b and an outer cover made of plastics. Magnetic flux leaking to the outside is thereby shielded, and even when a plurality of electromagnetic relays are mounted on a base, changes in characteristic values due to the magnetic interference among the relays can be prevented.

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 a cover for an electromagnetic relay.

[0002]

2. Description of the Related Art A conventional electromagnetic relay is composed of a coil block including a coil and an iron core, a movable contact spring block including an armature and a movable spring, an insulator base for housing them, and a plastic cover. ing.

FIG. 4 is an exploded perspective view of an electromagnetic relay showing a conventional example. As shown in FIG. 4, the conventional electromagnetic relay has a movable contact spring block 3 in which movable contact springs 3 each having a movable contact 1 and a hinge spring portion 2 are arranged on both sides of an armature 4 and integrally formed by an insulating fixed body 5. 100, the coil 8a is wound around a coil spool 8 made of an insulator in which the U-shaped iron core 6 and the coil terminal 7 are embedded, and the permanent magnet insertion hole 8b is provided in the central portion inside the U-shaped iron core 6. Coil block body 200 to which the permanent magnet 9 is fixed
And a fixed terminal 12 to which a fixed contact 11 is fixed, a neutral terminal 1
3 and a coil lead-out terminal 14 are embedded in a box-shaped insulator 15 having an open upper side, and an insulator base 300, and a cover 16 having a direction indicating mark 17 formed on its upper surface. In assembling such an electromagnetic relay, after the coil block body 200 is fitted and fixed inside the insulator base 300, the coil terminal 7 and the coil lead-out terminal 14 are joined together by a method such as welding. Next, the movable contact spring block 100 is inserted and fixed by fixing the hinge spring portion 2 and the neutral terminal 13. Finally, the plastic cover 16 is inserted and completed. A protrusion serving as a fulcrum for tilting the movable contact spring block 100 is formed in the lower center of the armature 4 and is in contact with the upper surface of the permanent magnet 5.

5A to 5C are conceptual diagrams when a plurality of electromagnetic relays shown in FIG. 4 are mounted on one board. As shown in FIGS. 5A to 5C, the direction indicating mark 17 coincides with the direction indicating mark 17 on the cover 16 in FIG. 4 described above. Reference numeral 18 represents an electromagnetic relay. First, as shown in FIG. 5A, when the other electromagnetic relays 18 are mounted side by side on both sides in the X direction, compared with the case where the other electromagnetic relays 18 are mounted side by side on the both sides in the Y direction due to the structure of the magnetic circuit of the electromagnetic relay in FIG. Therefore, the change in the characteristic value due to the mutual magnetism is large. Next, as shown in FIGS. 5B and 5C, when the electromagnetic relays 18 are mounted side by side so as to surround the surroundings, the change in the characteristic value is further increased. As described above, the reason why the characteristic value changes depending on the direction in which the electromagnetic relays 18 are arranged is that the distance between the magnetic circuits of the electromagnetic relays is different, the relative magnetic circuit area is different, and the like. Due to the effect of leakage flux.

[0005]

The above-mentioned conventional electromagnetic relay has a drawback in that, due to the structure of the magnetic circuit, when a plurality of electromagnetic relays are mounted on a single substrate, the characteristic values change depending on the arrangement direction. ..

An object of the present invention is to provide an electromagnetic relay capable of suppressing such characteristic value fluctuations, that is, preventing mutual magnetic interference.

[0007]

The electromagnetic relay of the present invention comprises:
A coil block body in which a coil is wound around a U-shaped iron core,
At least one end face of the permanent magnet is arranged so as to be in contact with the iron core, an armature is arranged so that both ends of the permanent magnet are opposed to both end faces of the iron core, and both ends of the armature are both end faces of the iron core. And a movable contact spring block integrally formed of an insulator with a movable contact spring having a movable contact at its tip, which is interlocked with the tilting motion of the armature and a hinge spring part for supporting the tilting motion of contacting and separating with the movable contact. Integrally formed with an insulator so as to implant a fixed terminal provided with a fixed contact arranged to face with each other, a neutral terminal connected to one end of the hinge spring portion, and a coil lead-out terminal connected to the coil terminal. The insulator base, the coil block body, the permanent magnet,
A box-shaped cover that integrally houses the movable contact spring block and the insulator base therein is formed, and the cover is configured by mixing a filler made of a magnetic material into a plastic base material.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view of a cover in an electromagnetic relay for explaining a first embodiment of the present invention. As shown in FIG. 1, the basic structure of the electromagnetic relay in this embodiment is the same as that of the conventional example of FIG. 4 described above, and the difference is in the structure of the cover 16 in FIG. That is, the cover 161 in the present embodiment represents the AA cross section of the cover 16 in FIG. This embodiment is different from the conventional example in that the plastic base material 161 of the cover 16 is different.
This is because the magnetic filler 161a made of a magnetic material such as iron or nickel was mixed in b. The magnetic filler 161a has a structure in which the magnetic filler 161a is connected to the plastic base material 161b while being overlapped with each other.
The cover 161 is formed together with b. With this cover structure, the magnetic flux leaking from the magnetic circuit of the electromagnetic relay body is shielded by the magnetic filler 161a in the cover 161. Therefore, it does not affect other electromagnetic relays and the characteristic values do not change due to mutual magnetic interference.

FIG. 2 is a sectional view of a cover used in an electromagnetic relay for explaining a second embodiment of the present invention. As shown in FIG. 2, the cover of this embodiment is different from the first embodiment of FIG. 1 described above in that an outer cover 162 made of a plastic material is provided outside the cover 161.
The cover 161 serving as an inner cover is provided with a magnetic filler 161a
And the plastic base material 161b. According to this embodiment, the dielectric breakdown voltage between the outer cover 162 and the electromagnetic relay body can be increased.

FIG. 3 is a sectional view of a cover used in an electromagnetic relay for explaining a third embodiment of the present invention. As shown in FIG. 3, the cover in this embodiment is the outer cover 1
Inside 62, an inner cover 162a made of a magnetic material such as iron or nickel is provided. This embodiment can also exhibit the same effect as the second embodiment described above. Further, in this embodiment, the inner cover 162a made of a magnetic material is used.
May be formed by coating the inside of the outer cover 162 with a magnetic material or by coating by plating or sputtering.

Although the three embodiments have been described above, the shape and size of the magnetic filler are not particularly limited, and the shape and size or thickness of the cover and the manufacturing method do not matter. Also, after manufacturing the outer cover and inner cover separately,
They may be combined with each other, or they may be integrally injection-molded by a two-color molding technique. Furthermore, the structure of the electromagnetic relay is not limited to that shown in FIG. 4, and the same effect can be exhibited as long as it is a polar electromagnetic relay.

[0012]

As described above, in the electromagnetic relay of the present invention, a plastic base material is mixed with a filler made of a magnetic material, or a plastic base material is mixed with a filler made of a magnetic material. The leakage magnetic flux to the outside is shielded depending on whether or not it is formed with an outer cover made of plastic material, and the characteristic values can be changed by mutual magnetic interference even when mounting multiple electromagnetic relays on one board. There is no effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cover used in an electromagnetic relay for explaining a first embodiment of the present invention.

FIG. 2 is a sectional view of a cover used in an electromagnetic relay for explaining a second embodiment of the present invention.

FIG. 3 is a sectional view of a cover used in an electromagnetic relay for explaining a third embodiment of the present invention.

FIG. 4 is an exploded perspective view of an electromagnetic relay showing a conventional example.

5 is a conceptual diagram when a plurality of electromagnetic relays shown in FIG. 4 are mounted side by side.

[Explanation of symbols]

 100 movable contact spring block 161 cover (inner cover) 161a magnetic filler 161b plastic base material 162 outer cover 162a magnetic inner cover 200 coil block body 300 insulator base

Claims (4)

[Claims] 1. A coil block body, in which a coil is wound around a U-shaped iron core, a permanent magnet arranged so that at least one end face contacts the iron core, and both end portions of the self are opposed to both end faces of the iron core. And a hinge spring portion for supporting a tilting motion in which both ends of the armature are arranged so as to come into contact with and separate from both end faces of the iron core, and a movable contact is provided at a tip end in conjunction with the tilting motion of the armature. A movable contact spring block in which a movable contact spring is integrally molded with an insulator, a fixed terminal having a fixed contact arranged to face the movable contact, a neutral terminal connected to one end of the hinge spring portion, and the coil. An insulator base integrally molded with an insulator so as to implant a coil lead-out terminal connected to the terminal, the coil block body,
A box-shaped cover that integrally houses the permanent magnet, the movable contact spring block, and the insulator base therein, and the cover is formed by mixing a filler made of a magnetic material into a plastic base material. Electromagnetic relay characterized by the following. 2. The electromagnetic relay according to claim 1, wherein the cover is formed of an inner cover made of a plastic base material mixed with a filler made of a magnetic material and an outer cover made of a plastic material. 3. The electromagnetic relay according to claim 1, wherein the cover is formed of an inner cover made of a magnetic material and an outer cover made of a plastic material. 4. The electromagnetic relay according to claim 1, wherein the cover is formed by coating a magnetic material inside a cover made of a plastic material.