JPS6118598Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic relay in which the insulating member between the coil and the movable contact piece also serves as a reinforcing member of the base.

Conventionally, as an electromagnetic relay, a movable contact piece is installed between the respective insulating partitions on a base having a plurality of insulating partitions arranged in parallel between both sides of a square-shaped frame, A device in which an electromagnetic block is arranged on the movable contact piece is also known.
In this configuration, the strength of the base is reduced due to the notch effect between the insulating partitions, so if the printed wiring board is deformed when the terminals protruding from the base are attached to the printed wiring board, the above-mentioned The base was twisted and damaged.

In addition, since the space between the coil and the movable contact piece becomes narrow, some methods include interposing insulating parts between the two or wrapping insulating tape around the coil, but these are only methods of electrically insulating between the two. Suzuzu,
On the contrary, these may hinder the reduction in thickness.

This idea was made in view of the above circumstances,
By specifying an insulating member arranged between a coil and a movable contact piece, it can also serve as reinforcement for the base and provide an electromagnetic relay that can be made thinner without impairing insulation properties. The purpose is to

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 1 shows an exploded perspective view of an electromagnetic relay according to an embodiment of the present invention, and FIG. 2 shows a partially cutaway side view of the assembled state. In these figures, 10 is a box-shaped base, 11 is an armature, 1
2 is an electromagnetic block, 13 is a back cover, and 14 is a case.

The base 10 is made of synthetic resin, and includes a bottom part 17 in which a plurality of insulating partition walls 16 are integrally formed in parallel on both sides of a rectangular frame part 15, and a bottom part 17 is integrally formed on the periphery of this bottom part 17. It consists of a surrounding part 18. As can be seen from FIGS. 3 and 4, a plurality of sets of normally open contact terminals 19 are provided on both sides of the base 10.
a, 19b and normally closed contact terminals 20a, 20b are provided in a crab-leg shape by insert molding.
For each contact 21a (see FIG. 3) provided at the inner end of each normally open contact terminal 19a on one side, the movable contact piece 22 of each normally open contact terminal 19b on the other side
A contact 21b provided at b is arranged. In addition, for the contact 23b 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 23a is arranged. As can be seen from FIGS. 3 and 4, the normally closed contacts 21a, 21b are set near one side (left side) in the base 10, and the normally closed contacts 23a,
23b is set near the other side (on the right side). The base 10 further includes normally open contact terminals 19a and 19b.
Four coil terminals 24 are provided on both sides of the terminal group of normally closed contact terminals 20a and 20b. Each movable contact piece 22a, 22b is arranged between each insulating partition part 16, 16 of the base 10, and on the insulating partition part 16, an insulating plate 25 made of synthetic resin is provided.
is installed across each insulating partition wall portion 16. The insulating plate 25 has a U-shaped cross section and consists of a bottom portion 25a and both side walls 25b, 25b.
5b and 25b have a shape that surrounds the coil 48, and enter into an inner peripheral space S in an armature block, which will be described later. As shown in FIG. 5, protrusions 26, 26 are formed at both ends of the lower surface of the insulating plate 25, and these protrusions 26, 26 are inserted into holes 27, 27 provided in the insulating partitions 16, 16 at both ends. In the fitted and positioned state, the outer surface of the bottom portion 25a of the insulating plate 25 is fixed to the insulating partition wall portions 16, 16, for example, with an adhesive.

As shown in FIGS. 1, 2, and 6, semicircular recesses 28, 28 are provided at the center of both ends of the bottom 17 of the base 10 in the parallel direction of the movable contact pieces. Further, as shown in FIG. 7, the surrounding portion 18 of the base 10 has a groove 29.
The groove 29 is composed of an inner wall 30 and an outer wall 31 facing each other, and the upper surface side of the groove 29 is open upward over the entire circumference, and the bottom side is opened to the back surface through a large number of through holes 32. . A pair of left and right protrusions 34, 34 are formed on the upper surfaces of the two sides of the inner wall 30 in the parallel direction of the movable contact pieces, that is, the short sides 33, 33, and the upper surfaces of the four corners of the inner wall 30 are provided with the The inner end of the coil terminal 24, that is, the coil connection portion 2
4a is prominent.

On the other hand, the armature 11 is square-shaped, and has a permanent magnet 35 on one side and an iron piece 36 on the other side, which are integrally fixed to an insulating member 37 made of synthetic resin by insert molding. 35 and both ends 35a, 35 of iron piece 36
a, 36a, 36a are exposed from the insulating member 37. At the bottom of the insulating member 37, there is a card portion 38a that drives the movable contact piece 22a of each normally closed contact terminal 20a, and a movable contact piece 2 of each normally open contact terminal 19b.
A card portion 38b for driving the card 2b is formed integrally with the card portion 38b. In addition, the insulating member 37 is located at the lower center of the other two opposing sides of the armature 11.
Rotating shaft portions 41, 41 integrally formed with are arranged. Bearing members 39, 39 made of metal tubes are fitted onto these rotating shaft parts 41, 41, and these bearing members 3
9 and 39 are recesses 28 and 2 provided in the base 10.
It is positioned at 8. That is, the armature 11 has bearing members 39, 39 in the base 10.
It is supported so that it can swing freely.

As shown in FIG. 8, the iron core 4 of the electromagnetic block 12
2 includes a base 43 extending in a straight line and four finger parts 44a, 44 extending perpendicularly from both ends of the base 43.
a, 44b, and 44b, forming an H-shape as a whole. Finger portions 44a, 44 of iron core 42
Both ends 35a, 35a of the permanent magnet 35 are shown at a.
That is, the N pole and the S pole face each other, and the finger portions 44b,
Both ends 36a, 36a of the iron piece 36 face 44b. As shown in FIG. 9, the base 43 of the iron core 42 is integrally fixed to a coil spool 45 made of an electrically insulating material such as synthetic resin by insert molding,
(See FIG. 2) 46, 46 are integrally formed with wing-shaped insulating members 47, 47 that cover the upper surfaces of the finger portions 44a, 44a, 44b, 44b of the iron core 42. The coil 4 is attached to the outer periphery of the coil spool 45.
8 is wound, and the lower half of this coil 48 is the third
The electromagnetic block 12, which is fitted inside the insulating plate 25 as shown in FIG.
The upper end portion of the inner wall portion 30 is supported by the peripheral edge portions 47a, 47a. When the insulating members 47, 47 are disposed on the inner wall 30, protrusions (see FIG. 9) 5 are formed on both sides of the lower surface of each insulating member 47, 47.
0,50 is the long side 5 of the inner wall 30 as shown in FIG.
1 and 51, and the protrusion 5
The protrusions 52, 52 provided to connect the ends of the electromagnets 47 and 50 are pressed against the inner surfaces of the short sides 33, 33, and the electromagnetic block 12 is positioned in a plane, and each insulating member 47 , 47 are fitted with protrusions 34, 34 provided on the short sides 33, 33 of the inner wall portion 30.

Thereafter, the upper parts of the protrusions 34, 34 are heat-sealed to the insulating members 47, 47, and the electromagnetic block 12 is fixed to the base 10. At the center of the lower surface of the outer end side of both the insulating members 47, 47 is a sixth
As shown in FIGS. 9 and 9, pressing pieces 54, 54 are provided in a protruding manner.
9 and 39 are press-fixed into recesses 28 and 28 provided in the bottom 17 of the base 10.

The open end 14a of the case 14 (see FIG. 6) fits into the groove 29 between the inner wall 30 and outer wall 31 of the enclosure 18 from above the base 10 and is supported by the upper end of the outer wall 31. In addition, the back cover 13 allows
The base 10 leaves each through hole (see Figure 7) 32.
The lower end opening of is closed. The groove 29 includes the lower end 31a of the outer wall 31 and the peripheral edge 13 of the back cover 13.
each through hole 3 from the second groove 56 formed between a
2 is filled with a sealant 55. By filling the sealant 55 up to the groove 56, the peripheral edge 13a of the back cover 13 is sealed and fixed to the lower part 17 of the base 10, and the inner wall 30 and the side wall 14b of the case 14 are connected from the groove 29 to the inner wall 30 and the side wall 14b of the case 14. By flowing between the case 14 and the base 10, the case 14 and the base 10 are sealed and fixed, and each terminal 19a, 19b, 20a, 2
By surrounding the entire base of 0b and 24,
The entire circumference of the terminal base is also sealed.

In the above configuration, when the coil 48 is not energized, the N pole of the permanent magnet 35 of the armature 11,
The S pole uses its own magnetic force to attract the fingers 44a of the iron core 42,
44a, and the fingers 44 of the iron core 42
A, a closed magnetic path 57 (see FIG. 8) of the permanent magnet 35 is formed at the base 43 and the finger 44a. That is, as shown in FIG. 3, the armature 11 rotates counterclockwise around the rotation shafts 41, 41, and the normally open contact terminal 1 is rotated by the card portion 38b on the left side.
The movable contact piece 22b of 9b is bent downward to open a space between the contacts 21a and 21b. Further, as shown in FIG. 4, when the right card portion 38a escapes onto the movable contact piece 22a of the normally closed contact terminal 20a, the movable contact piece 22a returns by its own spring force, and the contact between the contacts 23a and 23b is closed. Closed.

When the coil 48 is energized to generate a magnetic flux in the opposite direction to the magnetic flux generated by the permanent magnet 35, the N and S poles of the permanent magnet 35 repel from the finger portions 44a, 44a, and the finger portion 44b on which magnetic poles are formed, 44b is both ends 36a, 36 of the iron piece 36 of the armature 11
a, the base 43 of the iron core 42, the finger portion 44b,
A closed magnetic path of the coil 48 is formed between the iron piece 36 and the finger portion 44b. At this time, amateur 11
The left card 38b escapes upward, and the movable contact piece 22b of the normally open contact terminal 19b returns by its own spring force, closing the contacts 21a and 21b.

Further, the right card portion 38a is lowered, the movable contact piece 22a of the normally closed contact terminal 20a is bent downward, and the contacts 23a and 23b are opened.

When the power supply to the coil 48 is cut off, the N and S poles of the permanent magnet 35 are again moved to the iron core 42 by their own magnetic force.
The contacts 21a and 21b are opened again, and the contacts 23a and 23b are closed again.

On the other hand, in the above configuration, the partition wall portion 16,
The insulating plate 25 fixed to the insulating plate 16 has a U-shaped cross section and compensates for the decrease in strength due to the notch effect between the insulating partitions 16, 16, so that the torsional strength of the base 10 is substantially improved. Become. Further, since the insulating plate 25 has a U-shaped cross section, the coil 48 of the electromagnetic block 12 is fitted into the inside, so that the coil 48 and the movable contact piece 22a disposed below the coil 48,
The insulation distance between 22b is large, and the two are reliably insulated.

By the way, the plurality of insulation partition walls 16, 16
It is conceivable to provide a rib or the like to reinforce the base across the gap, but doing so will increase the thickness of the electromagnetic relay and will not be able to accommodate thinning, and will not necessarily provide reliable insulation. .

However, in the above embodiment, since both side walls 25b, 25b of the U-shaped insulating plate 25 surround the coil 48, the creepage distance becomes large, and the insulation properties can be reliably improved. Since it enters into the inner peripheral space S of the amateur block, it is possible to minimize the increase in the thickness of the electromagnetic relay.

Note that the outer surface of the bottom portion 25a of the insulating plate 25 is fixed to the insulating partition 16 with an adhesive, with the protrusion 26 and hole 27 fitted together. , it can also be fixed by welding means.

As can be seen from the above description, according to this invention, the insulating member between the coil and the movable contact piece can also be used as a reinforcing member for the base, improving the torsional strength of the base, and without hindering the thinning of the base. It is possible to provide an electromagnetic relay that can improve insulation performance.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an electromagnetic relay according to an embodiment of the invention, Fig. 2 is a partially cutaway side view of the assembled state, Fig. 3 is a sectional view taken along line 3-3 in Fig. 2, and Fig. 4 is 2 is a sectional view taken along the line 4-4, FIG. 5 is a sectional view of the main part, FIG. The figure is a schematic perspective view of the electromagnet block and the armature, and FIG. 9 is a partially cutaway perspective view of the electromagnet block. 10...Base, 11...Amachiyua, 12...
...Electromagnetic block, 16...Insulating partition, 22
a, 22b...Movable contact piece, 25...Insulating plate, 2
5a...bottom, 25b, 25b...both side walls, 48
...Coil, S...Space.

Claims (1)

[Scope of utility model registration request] a base having a plurality of insulating partitions arranged in parallel between both sides of a rectangular frame; and a movable control piece located above the movable control piece disposed between the insulating partitions;
The electromagnet block is fixed to the base so that the axis of the coil is perpendicular to the plurality of insulating partition walls, and the coil in the electromagnet block is inserted into the inner space, and the partition wall and The electromagnet is attached to an insulating plate having a U-shaped cross section and a bottom and both sides extending in a direction orthogonal to the partition wall. The bottom part is interposed between the coil and the movable control piece so that the coil of the block is inserted, and the outer surface of the bottom part of the insulating plate is fixed to the plurality of insulating partition walls. Electromagnetic relay.