JPS61109237A - Electromagentic relay - 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 Field of the Invention The present invention relates to an electromagnetic relay having a fixed iron core.

<Prior art and its problems> As an electromagnetic relay having an H-shaped fixed core, a mouth-shaped armature is rotatably arranged around the H-shaped fixed core,
There is a device in which the armature is rotationally displaced by turning on and off the electromagnetic coil wound around the iron core, and the opening and closing of the contact mechanism is controlled via a card portion of the armature.

By the way, in the above-mentioned electromagnetic relay, it is necessary to smoothly perform the return operation after the armature is rotationally displaced and attracted to the fixed iron core, regardless of residual magnetism. For this reason, conventionally, as shown in FIG. 12, the fixed core 102 is inserted into the corner portions of the finger portions 108 at both ends of the fixed core 102 on the magnetic pole contact surface S of the fixed core 102 that comes into contact with the armature 101. A mold part 10 that covers the finger part 103 with a plastic projection 104 made of synthetic resin during molding.
5 (see FIG. 13).

However, in the configuration in which the protrusion 104 is molded with resin, variations in the thickness of the protrusion 104 tend to occur due to the shrinkage effect of the resin, and when the variation increases, the timing of the adsorption 1 separation operation between the fixed iron core 102 and the armature 101 side may be shifted. etc., and the operating characteristics are forced to deteriorate.

<Objective of the Invention> The object of the present invention is to provide a '4 magnetic relay in which the armature can be smoothly attracted to and separated from a fixed iron core, and can ensure stable operating characteristics.

<Configuration and Effects of the Invention> The electromagnetic relay according to the present invention is characterized in that a non-magnetic tape or thin film is locally provided on the magnetic pole contact surface of the H-shaped fixed core.

According to this invention, the tape or thin film allows the armature to operate on the fixed iron core without being affected by residual magnetism, and the thickness is more uniform compared to those made of resin, so the above-mentioned adsorption - Discrepancies in separation operation timing are eliminated, and operation characteristics are stabilized.

<Description of Embodiments> FIG. 1 shows an exploded perspective view of an electromagnetic relay according to the present invention, and FIGS. 2 to 4 show longitudinal sectional front views of various parts in an assembled state. In these figures, 10 is a box-shaped base, 11 is an armature, 12 is an electromagnetic block, 18 is a back cover, and 14 is a case.

The base 10 is made of synthetic resin, and includes a bottom s17 in which a plurality of insulating partition walls 16 are integrally formed in parallel between both sides of a mouth-shaped frame s15, and an enclosure integrally formed around the periphery of the bottom 17. It consists of part 18. As shown in FIGS. 2 and 8, a plurality of sets of normally open contact terminals 1 are provided on both sides of the base 10.
ga, 19b and normally closed contact terminals 20a, 20b are provided in a crab foot shape by insert molding. For each contact 21a provided at the inner end of each normally open contact terminal 19a, a contact 21b provided on the movable contact piece 22b of each normally open contact terminal 19b is arranged.

In addition, for the contact 28b provided at the inner end of each normally closed contact terminal 20b on one side, the contact provided on the movable contact piece 22a of each normally closed contact terminal 20a on the other side is 28a is arranged. The base 10 further includes normally open contact terminals 19a and 19b and a normally closed contact terminal 20.
Four coil terminals 24 are provided in a crab-like shape on both sides of the terminal group a and 20b. Each movable contact piece 22
a, 22 b are each insulating partition wall 16 of the base 10;
．． An insulating plate 48 made of synthetic resin and having a U-shaped cross section is fixed on the insulating partition wall 16. Further, as shown in FIGS. 1 and 4, semicircular recesses 44 (only one is shown) are provided at the center of both ends of the bottom portion 17 of the base 1o in the parallel direction of the movable contact pieces.

On the other hand, the armature 11 has iron pieces 25a and 25b that are magnetized by a permanent magnet 25 on one of two opposing sides.
The edicts 25C and 25d are placed on the other side, and an iron piece 26 is placed on the other side, and they are integrally fixed to an insulating member 27 made of synthetic resin by insert molding. The above permanent magnet 25 iron piece 25
a to 25d and both ends 26a and 26b of the iron piece 26 are exposed from the insulating member 27. A card portion 28a that drives the movable contact piece 22a of each normally closed contact terminal 20H and a card portion 28b that drives the movable contact piece 22b of each normally open contact terminal 19b are integrally formed in the lower part of the insulating member 27, respectively. ing.

Furthermore, a rotating shaft portion (only one of which is shown) 29 integrally formed with the insulating member 27 is disposed at the lower center of the other two opposing sides of the armature 11 .

A bearing member 80 made of a metal tube is fitted onto the rotating shaft portion 29 , and the bearing member 80 is positioned in a recess 44 provided in the base 10 . That is, amateur 1
1 is swingably supported within the base 10 by two bearing members ao, ao.

As shown in FIG. 6, the fixed core 81 of the electromagnetic block 12 has a base 32 extending in a straight line and four fingers aa a extending at right angles from both ends of the base 82.

It consists of 88a, 88b, and 88b, and has an H-shape as a whole. Finger portion 3 of fixed iron core 81
3a.

The iron piece 2 magnetized by the permanent magnet 25 is placed at 88a.
5a and 25b1, that is, the N and S poles face each other, and the finger parts 88b and 88b face both ends 26a and 26b of the iron piece 26.

An insulating tape 84 is wound around the base 82 of the iron core 81 as shown in FIG. This insulating tape 34 constitutes a spool 36 with collars 85, 85 located at both ends thereof. The portions 85 and 85 are the finger portions 88a and 33a of the iron core 81.

It is integrally formed with resin overhang pieces 36a and 86b that cover 88b and 38b. In other words, this spool 3
Part 6 is manufactured as follows.

First, as shown in FIG. 7, the insulating tape 34 is attached to the base of the iron core 31 so that both end surfaces of the bottle tape 34 in the Fukuoka direction are in contact with one inner surface of each of the fingers 88a to 38b of the iron core 31. 82. After that, each of the finger parts 88a to 3
Synthetic resin overhang pieces 86a, 86b are formed by insert molding so as to cover the upper surface of 3b.At this time, as shown in FIG.
86b Nisoti, warp and integral molding, and each inner peripheral end surface a5a of each collar part 85.35 as shown in FIG.
A coil 87 is wound around the outer periphery of the coil spool 34, and the lower half of this coil 87 is fitted into the inside of the insulating plate 48. .

The electromagnetic block 12 is disposed within the enclosure 18 of the base 10 and the overhang piece 86. The peripheral edge of f36 is supported by the upper end of the enclosure 18. Overhang piece f36
a, 86b on the enclosing part 18, a portion of the overhanging pieces 86a, f36b are placed on the long side part 88 of the enclosing part 18,
89, pressed against the inner surface of the short side 40° 41, 1EfIi
While the stone block 12 is positioned two-dimensionally, each overhang piece 86a.

The pressing piece 42 integrally formed on the lower surface of the fourth
As shown in the figure, the bearing member aO is located at the bottom 17 of the base 10.
It is pressed and fixed in the recess 44 of.

As shown in FIG. 6, a tape 45 made of a non-magnetic material such as Teflon is attached to each corner of the finger portions aaa and aab of the magnetic pole contact surface 8 of the R-shaped fixed iron core 81, for example.

On the other hand, the open end 14a of the case 14 is fitted into the upper end of the enclosure 18 of the base 10, and the lower end opening of the base 10 is closed by the back cover 18.

In the figure, 46 is a hole formed in the base 10 through which the inner end portion of the coil terminal 24 passes; 47 is a hole formed in the overhang pieces 36a, 86b corresponding to the hole 45; 48 is a hole formed in the overhang pieces 36a, 86b; This is a relay terminal that is press-fitted into the hole 47 and electrically connected to the inner end of the coil terminal 24 .

In the above configuration, when the coil 87 is not energized,
The fingers of the iron core 31 as
a and aaa, respectively, and the finger portions 88a of the iron core 31
A closed magnetic path M (see FIG. 5) of the permanent magnet 25 is formed in the base portion 32 and the finger portion 33a. That is, as shown in FIG. 2, the armature 11 rotates counterclockwise around the rotation shaft 29, and the movable contact piece 22b of the normally open contact terminal 19b is bent downward by the card portion 28b on the left side. ,
The contact points 21a and 2ib are open. In addition, the card portion 28a on the right side is the movable contact piece 22 of the normally closed contact terminal 20a.
By moving away, the movable contact piece 22a returns with its own spring force, closing the contacts 23a and 28b.

When the coil 87 is energized to generate magnetic flux in the opposite direction to the magnetic flux generated by the permanent magnet 25, the iron piece 25a on the permanent magnet 25 side,
The N and S poles of 25b are finger portions 83a.

Finger portion a that is repelled from 88a and has a magnetic pole formed thereon.
ab and sab are both ends 25 of iron piece 26 of armature 11
a, 26b are attracted, and a closed magnetic path of the coil 87 is formed between the base s82 of the iron core 81, the finger portion 88b1, the iron piece 26, and the finger gaab. At this time, amateur 11
The left card 28b escapes upward, and the movable contact piece 22b of the normally open contact terminal 19b returns by its own spring force.
Contact point 21a.

2ib is closed. Further, the right card portion 28a is lowered, the movable contact piece 22a of the normally closed contact terminal 20a is bent downward, and the contacts 28a and 2Bb are opened.

When the power to the coil 37 is cut off, the permanent magnet 2 is turned off again.
The magnetic force of the iron pieces 25a and 25b that received the magnetic force of
finger $882. Each adsorbs to Baa and contacts 21 again.
The contacts a and 21b are opened, and the contacts 28a and 28b are closed.

Here, since the non-magnetic tape 45 is attached to a part of the magnetic pole contact surface S attached to the iron core 81, the armature 11 can perform attracting and separating operations without being affected by residual magnetism.

In particular, the above-mentioned shield-like body is not a resin molded body, but a tape 4.
5, there is no variation in thickness, and therefore the timing of the above-mentioned adsorption/separation operation can be performed appropriately, and the operation characteristics are also stable.

Incidentally, in the above example, the tape 45 is used as the tape 45, but the same effect as described above can also be achieved by using a Teflon coating or a coating formed by baking epoxy powder.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an electromagnetic relay according to an embodiment of the present invention, Fig. 2 is a front view of the normally open contact portion of the relay in the assembled state, and Fig. 3 is a normally closed contact portion of the relay. FIG. 4 is a front view of the MWt at the armature support part, FIG. 5 is a schematic perspective view of the electromagnet block and the armature, FIG. 6 is a partially cutaway perspective view of the electromagnet block, FIGS. Fig. 8 is an explanatory diagram of the coil spool, Fig. 9 is an enlarged sectional view of the part marked ■ in Fig. 8, Fig. 10 is an explanatory diagram of the magnetic layer tape provided on the magnetic pole contact surface of the fixed female core, and Fig. 11 is an explanatory diagram of the coil spool. The figure is the first
0, FIG. 12 is an explanatory view of the main parts of a conventional electromagnetic relay, and FIG. 13 is an enlarged sectional view of the portion marked ■ in FIG. 12. 10...Base, 11...Amateur, 21a. 21b, 28a, 28b--Contact, 31-H type fixed core, 37-Coil, 45--Shin magnetic layer tape,
S...Magnetic pole contact surface. Figure 4 Figure 5 Figure 7 Figure 8 Figure 33a 33a Figure 9 Figure 10 Figure 12

Claims (1)

[Claims] (1) A square-shaped armature is rotatably arranged around the H-shaped fixed core fixed to the base, and the armature is rotationally displaced by turning on and off the electromagnetic coil wound around the core. 1. An electromagnetic relay configured to control the opening and closing of contact portions by using the iron core, characterized in that a magnetic tape or film made of a non-magnetic material is locally provided on the magnetic pole abutting surface of the iron core.