JPS649696B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay with an improved structure for blocking residual magnetism.

Conventionally, in electromagnetic relays, rivets made of non-magnetic material are caulked or fixed to the magnetically-adsorbed surface in order to block the residual magnetism generated on the magnetically-adsorbed surface in order to smooth the return operation of the armature. A method of fixing the metal magnetic shielding plate by welding has been used, but the former method by caulking causes distortion of the magnetic attraction surface, and the latter method by welding causes the magnetic shielding plate to warp. Furthermore, in either case, caulking and welding operations are required, which makes fixing the magnetic shielding plate that much more troublesome.

In addition, conventionally, in order to prevent the abrasion powder generated by the rotation of the armature from adhering to the contact mechanism, the magnetic shielding plate is formed widely, and the abrasion powder generated on the armature side is received by the magnetic shielding plate. It is known that people try to stop the printing. (Refer to Japanese Utility Model Publication No. 55-148147) Since the magnetic shielding plate is formed wide, its peripheral edge can extend to the inner circumferential surface of the case. The stepped portion can press the peripheral edge of the magnetic shielding plate to hold the magnetic shielding plate.

According to such a configuration, there is no need for caulking or welding work to fix the magnetic shielding plate, but since the peripheral edge of the magnetic shielding plate is pressed, warpage occurs in the central part, and magnetic adsorption is caused. It stands out from the surface, and has the same drawback as the conventional example described above.

This invention has been made in order to improve the above-mentioned drawbacks, and an object of the present invention is to provide an electromagnetic relay in which the magnetic shielding plate can be easily fixed without causing distortion on the magnetic attraction surface or lifting of the magnetic shielding plate. With the goal.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an exploded perspective view of a sealed electromagnetic relay according to an embodiment of the invention, and FIG. 2 shows a partially cutaway side view of the assembled state. In these figures, 20 is a box-shaped base, 21 is an armature, 22 is an electromagnetic block, 23 is a back cover, and 24 is a case.

The box-shaped base 20 is made of synthetic resin, and includes a bottom portion 27 in which a plurality of insulating partition walls 26 are integrally formed in parallel between both sides of a square-shaped frame portion 25;
A surrounding portion 28 integrally formed on the periphery of this bottom portion 27
It consists of As can be seen from Figures 3 and 4,
A plurality of sets of normally open contact terminals 29a, 29b and normally closed contact terminals 30a, 30 are provided on both sides of the box-shaped base 20.
b are provided in a crab foot shape by insert molding. For the contact 31a provided at the inner end of each normally open contact terminal 29a on one side (see FIG. 3), the contact 31b provided on the movable contact piece 32b of each normally open contact terminal 29b on the other side is It is located. In addition, for the contact 33b provided at the inner end of each normally closed contact terminal 30b on one side, the contact provided on the movable contact piece 32a of each normally closed contact terminal 30a on the other side is 3a is placed. As can be seen from FIGS. 3 and 4, the normally open side contacts 31a and 31b are set near one side (left side) in the base 20, and the normally closed side contacts 33
a and 33b are set near the other side (on the right side). The base 20 further includes a normally open contact terminal 29a,
Four coil terminals 34 are provided on both sides of the terminal group of 29b and normally closed contact terminals 30a and 30b. Each movable contact piece 32a, 32b is arranged between each insulating partition wall part 26, 26 of the box-shaped base 20.

As shown in FIGS. 1, 2, and 5, semicircular recesses 35, 35 are provided at the center of both ends of the bottom 27 of the base 20 in the parallel direction of the movable contact pieces. Further, as shown in FIG. 6, the enclosure part 28 of the base 20 has an inner wall part 37 and an outer wall part 38 facing each other with a groove 36 in between.
The upper surface side of the groove 36 is opened upwardly over the entire circumference, and the bottom side has a large number of through holes 39.
It opens on the back side. The two sides of the inner wall portion 37 in the parallel direction of the movable contact pieces, that is, the short sides 40, 4
0 has a pair of left and right protrusions 41, 41 on the upper surface, respectively.
are formed, and the inner end portions of the coil terminals 34, that is, the coil connecting portions 34a, protrude from the upper surface portions of the four corners of the inner wall portion 37.

On the other hand, the armature 21 is square-shaped, and has a permanent magnet 42 on one of its two opposing sides and an iron piece 43 on the other side, and an insulating member 4 made of synthetic resin.
4 by insert molding, both ends 42a of the permanent magnet 42 and the iron piece 43,
42a, 43a, and 43a are exposed from the insulating member 44. A card portion 45a that drives the movable contact piece 32a of each normally closed contact terminal 30a and a card portion 45b that drives the movable contact piece 32b of each normally open contact terminal 29b are integrally formed in the lower part of the insulating member 44, respectively. ing. Furthermore, rotating shaft portions 46, 46 integrally formed with the insulating member 44 are arranged at the lower center of the other two opposing sides of the armature 21. Bearing members 47, 47 made of metal tubes are fitted onto the rotating shaft parts 46, 46, and these bearing members 47, 47 are attached to the recesses 3 provided in the base 20.
It is positioned at 5,35. That is, the armature 21 is attached to the bearing member 4 within the base 20.
7, 47 so as to be swingable. The central space part of the amateur 21 is a coil storage part 48,
An insulating plate 49 integrally formed with the insulating member 44 is disposed at the lower part of the coil storage portion 48 .

As shown in FIG. 7, the iron core 5 of the electromagnetic block 22
0 has a base 51 extending in a straight line and four finger parts 52a, 52 extending perpendicularly from both ends of this base 51.
a, 52b, and 52b, forming an H-shape as a whole. Finger portions 52a, 52 of iron core 50
Both ends 42a, 42 of the permanent magnet 42 are shown at a.
a, that is, the north pole and the south pole face each other, and the finger portion 52
b, 52b have both ends 43a, 43a of the iron piece 43.
are facing each other. As shown in FIG. 8, the base 51 of the iron core 50 is integrally fixed to a coil spool 53 made of an electrically insulating material such as synthetic resin by insert molding, and the flange portions 54 at both ends of the coil spool 53,
54 has finger portions 52a, 52a, 52 of the iron core 50.
b, a wing-shaped insulating member 55 covering the upper surface of 52b,
55 are integrally formed. A coil 56 is wound around the outer periphery of the coil spool 53. The lower half of this coil 56 is fitted into the coil storage portion 48 of the armature 21 described above together with the flanges 54 at both ends of the coil spool 53, and each movable contact piece 3
a and 32b are electrically insulated.

The electromagnetic block 22 is disposed within the enclosure 28 of the base 20, and the insulating members 55, 55
The upper end portion of the inner wall portion 37 is supported at the peripheral edge portions 55a, 55a of the inner wall portion 37. When the insulating members 55, 55 are arranged on the inner wall portion 37, each insulating member 55, 55
Projections formed on both sides of the lower surface (see Figure 8) 5
7, 57 are in pressure contact with the inner surfaces of the long sides 58, 58 of the inner wall portion 37, and protrusions 59, 59 are provided so as to connect one end of the protrusions 57, 57.
are in pressure contact with the inner surfaces of the short sides 40, 40, and the electromagnetic block 22 is positioned in a plane,
Through holes 6 provided on the left and right sides of each insulating member 55, 55
0 and 60, the upper portions of the protrusions 41 and 41 provided on the short sides 40 and 40 of the inner wall portion 37 are connected to the insulating member 55,
55, and the electromagnetic block 22 is fixed to the base 20. Both insulating members 5
At the center of the lower surface of the outer end of the
As shown in the figure, pressing pieces 61, 61 are provided protrudingly, and these pressing pieces 61, 61 push the bearing members 47, 47 into the recesses 35, 3 provided in the bottom 27 of the base 20.
It is pressed and fixed at 5.

The open end 24a of the case 24 (see FIG. 5) fits into a groove 36 between the inner wall 37 and the outer wall 38 of the enclosure 28 from above the base 20, and is supported by the upper end of the outer wall 38. In addition, the back cover 23 allows
The base 20 leaves each through hole (see Figure 6) 39.
The lower end opening of is closed. The groove 36 includes the lower end 38a of the outer wall 38 and the peripheral edge 23 of the back cover 23.
A sealant 63 is filled through each through hole 39 from a second groove 62 formed between the second groove 62 and the second groove 62 formed between the second groove 62 and the second groove 62 . By filling the sealant 63 up to the groove 62, the peripheral edge 23a of the back cover 23 is hermetically sealed and fixed to the bottom 27 of the base 20.
6 between the inner wall portion 37 and the side wall portion 24b of the case 24, the case 24 and the base 20 are airtightly sealed and fixed, and each terminal 29a is connected to the through hole 39 in FIG. ,29b,3
By wrapping the entire circumference of the bases of 0a, 30b and 34, the entire circumference of the terminal base is also sealed.

As shown in FIGS. 2 and 8, an H-shaped magnetic shielding plate 64 made of a non-magnetic material is disposed on the lower surface of the iron core 50 and has an H shape that conforms to the shape of the iron core. The center part 64a of this magnetic shielding plate 64 is connected to the coil spool 53, and the three peripheral sides 64b, 64b at both ends are connected to the insulating members 55, 5.
5 are fixed to the iron core 50, respectively.

The magnetic shielding plate 64 was fixed to the coil spool 53 side by insert molding in contact with the lower surface of the iron core 50, but as shown in FIGS. Both of them 42 and 43 can be fixed to the insulating member 44 of the armature 21 by insert molding.

In the above configuration, when the coil 56 is not energized, the N pole of the permanent magnet 42 of the armature 21,
The finger portion 52a of the iron core 50,
52b and the fingers 6 of the magnetic shielding plate 64.
4c, 64c, the finger portion 52a of the iron core 50,
Permanent magnet 42 at base 51 and finger 52a
A closed magnetic path 65 is formed. That is, the third
As shown in the figure, the armature 21 is connected to the rotating shaft portions 46, 46.
Rotate counterclockwise around the left card section 4.
5b, the movable contact piece 32 of the normally open contact terminal 29b
b is bent downward, and the contact points 31a and 31b are opened. In addition, as shown in FIG. 4, the card portion 45a on the right side escapes onto the movable contact piece 32a of the normally closed contact terminal 30a, and this movable contact piece 3
2a returns with its own spring force, and contacts 33a, 33
b is closed.

When the coil 56 is energized to generate magnetic flux in the opposite direction to the magnetic flux generated by the permanent magnet 42, the N and S poles of the permanent magnet 42 repel from the finger portions 52a and 52a, and the finger portions 52b and 52b, on which magnetic poles are formed, are repelled. 52b is both ends 43a, 43 of the iron piece 43 of the armature 21
a is attracted and brought into contact with the fingers 64d, 64d of the magnetic shielding plate 64, and a closed magnetic path of the coil 56 is formed between the base 51 of the iron core 50, the fingers 52b, the iron piece 43, and the fingers 52b. At this time, the card 45b on the left side of the armature 21 escapes upward, and the movable contact piece 32b of the normally open contact terminal 29b returns by its own spring force, closing the contacts 31a and 31b. Further, the right card portion 45a is lowered, the movable contact piece 32a of the normally closed contact terminal 30a is bent downward, and the contacts 33a and 33b are opened.

When the power supply to the coil 56 is cut off, the N and S poles of the permanent magnet 42 are again moved toward the iron core 50 by their own magnetic force.
The contacts 31a and 31b are opened again, and the contacts 33a and 33b are respectively attracted to the finger parts 52a and 52a.
The gap closes.

In the above configuration, when the armature 21 rotates clockwise from the state shown in FIG.
The magnetic attraction surface 66 (see FIG. 7) of the iron piece 43 of No. 1 is attracted to the magnetic attraction surface 67 of the iron core 50 via the magnetic shielding plate 64, so both magnetic attraction surfaces 66, 67
No residual magnetism occurs between them.

On the other hand, in the above configuration, the magnetic shielding plate 64 is the coil spool 53 or the insulating member 4 of the armature 21.
Since it is fixed to the iron core 50 or permanent magnet 42 and iron piece 43 by insert molding in step 4, it can be easily fixed with less man-hours and without using special jigs and tools, compared to the conventional fixing structure using caulking or welding. At the same time, the magnetic shielding plate 64 can be properly fixed without causing distortion in the magnetic attraction surface or warping of the magnetic shielding plate.

As can be seen from the above description, according to the present invention, a magnetic shielding plate is joined to an H-shaped iron core and integrally insert-molded, and the magnetic shielding plate is fixed and held on the iron core using an insulating member made of synthetic resin. Because of this, there is no risk of distortion on the magnetic attraction surface or lifting of the magnetic shielding plate, and the operation and return characteristics of the armature are stable.

Further, since the insert molding of the magnetic shielding plate can be performed in the same step of inserting the coil spool into the central base of the iron core, the work of fixing the magnetic shielding plate is easy.

Insert molding of the above-mentioned magnetic shielding plate is not limited to electromagnetic blocks, and may be performed in the same process of insert-molding permanent magnets and iron pieces that removably contact both ends of the above-mentioned iron core to form a rectangular armature. A similar effect can be achieved.

[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 partially cutaway side view of the assembled state, FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG. 4-4 line sectional view in Figure 2, Figure 5 is 5 in Figure 2.
-5 line sectional view, Figure 6 is a partially cutaway perspective view of the base, Figure 7 is a schematic perspective view of the electromagnet block and armature, Figure 8 is a partially cutaway perspective view of the electromagnet block, and Figure 9 is the armature. FIG. 10 is a sectional view taken along line 10-10 in FIG. 21...Amateur, 22...Electromagnetic block, 4
4... Insulating member, 50... Iron core, 53... Coil spool, 55... Both end ribs, 64... Magnetic shielding plate, 66, 6
7...Magnetic adsorption surface.

Claims (1)

[Claims] 1. A synthetic resin coil spool around which an electromagnetic coil is wound, an approximately H-shaped iron core insert-molded at the center base of this coil spool, and synthetic resin insulation coated on the peripheral edges of both ends of this iron core. a box-shaped terminal base that fixedly holds the electromagnetic block consisting of the coil spool and the iron core, and a box-shaped terminal base that is rotatably held between the electromagnetic block and the terminal base and can be attached to and removed from both ends of the iron core. a square-shaped armature made by insert-molding a permanent magnet and an iron piece into an insulating member made of synthetic resin; and a magnetic attraction surface of at least one of the armature and the electromagnet block. 1. An electromagnetic relay comprising: a magnetic shielding plate formed by insert molding into an insulating member formed in the insulating member.