JPH0142455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay in which a contact mechanism is opened and closed by the see-saw movement of a movable block consisting of armatures and a pair of permanent magnets disposed above and below an electromagnetic block.

In this type of electromagnetic relay, in order to reduce the number of parts as much as possible, it is preferred to bond the upper and lower armatures together with adhesive, but if too much adhesive is applied, Not only can excess adhesive flow into the suction part of the armature or the rotating shaft and cause malfunction, but variations in the thickness of the adhesive can lead to variations in the distance between both armatures and the core, causing the suction to fail. There is a risk that the force characteristics may become unstable, and there is an urgent need to implement countermeasures.

This invention was made in response to the above request, and by specifying the structure of the adhesive surface, it is possible to effectively prevent defects due to excess adhesive leakage and property deterioration due to variations in adhesive thickness. The purpose is to provide

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an exploded perspective view of an electromagnetic relay according to an embodiment of the invention, and FIG. 2 shows a front sectional view of the assembled state. In these figures,
10 is a box-shaped base, 11 is a movable block, 12
1 is an electromagnetic block, 13 is a back cover, and 14 is a case.

The base 10 is made of synthetic resin and consists of a bottom part 17 having a central partition wall part 16 within a frame part 15, and an enclosure part 18 integrally formed around the periphery of this bottom part 17. The enclosure part 18 is shown in FIG. It consists of an inner wall part 181 and an outer wall part 182 which face each other with a groove 180 for filling the sealant M in between. Above camera back 13
There is also a groove 131 corresponding to the groove 180 on the outer peripheral edge of the
It is formed.

On both sides of the base 10 in the width direction, a plurality of sets of external terminals 19 and 20 are provided in the form of legs along the longitudinal direction by insert molding.

Contact mechanism setting parts 21 and 22 are formed in the bottom part 17 with the partition wall part 16 in between. movable contact piece 23,2
4 are arranged. Each contact 2 of the fixed contact pieces 25 and 26 is provided at the tip of each of the movable contact pieces 23 and 24.
Contacts 29 and 30 corresponding to 7 and 28 are fixed, and these movable and fixed contact pieces 25 and 26 constitute a contact mechanism 100.

The case 14 is fitted onto the inner wall 181 so that the open end 14a is positioned above the groove 180 of the base 10. In this embodiment, the inner wall portion 181 is formed longer than the outer wall portion 182, so that the case 14 can be easily fitted. Further, the back cover 13 also has its convex striped edge 13a fitted inside the outer wall 182 of the base 10, so that
It is fitted into the lower part of the terminal base 10. From the groove 131 of the back cover 13 to the groove 180 of the terminal base 10
The fitting portions of the terminal base 10, back cover 13, and case 14 are sealed by filling the interior with a sealant _M1 .

The electromagnetic block 12 consists of a core 31, a spool 32, and coils 33 and 34. core 3
1 is a plate-shaped magnetic material molded into a substantially H-shape as shown in FIG.
1a, coils 33 and 34 are attached to the core 31 via a spool 32 insert-molded in the core 31, for example in a state where they are wound in opposite directions. Reference numeral 35 denotes a partition wall formed at the center of the spool 32 to insulate and isolate both the coils 33 and 34. The partition wall 35 has shaft bodies 36 and 36 extending in a direction perpendicular to the axes of the coils 33 and 34. are integrally formed. The electromagnetic block 12 includes a core 31
Wing-like insulators 120, 121 are integrally formed with the spool 32, with both ends 31b, 31c inserted, and these insulators 12
Each of the tip portions 371 to 374 of 0,121 is a fitting window portion 3 formed in the inner wall portion 181 of the base 10.
8, 381 to 384 and slightly protrudes outward.

A notch 141 is formed on the inner surface of the side wall 140 of the case 14, corresponding to each tip 37 of the insulators 120, 121 protruding from the window 38. Groove 180
is connected to. A sealant filled from the groove 131 of the back cover 13 to the groove 180 of the terminal base 10
By wrapping M ₁ into the notch 141, each of the tips 31 ₁ to 37 ₄ of the insulators 120 and 121
is integrally fixed to the base 10 and case 14.

39 is a partition wall portion 35 in the electromagnetic block 12
This is a convex part vertically provided on the lower surface of the terminal base 10, and this convex part 39 is fitted into a through hole 40 formed in the terminal base 10, and a small hole 132, like a gas vent hole, formed in the back cover 13. It is fixed to the base 10 and back cover 13 with a sealant M ₂ injected from above (FIG. 2). The sealant _M2 is injected after the sealant _M1 at the fitting portion has been sufficiently dried and hardened and the internal gas has been exhausted.

41, 41 and 42, 42 are each coil 33,
34 lead terminals, which are formed into pin shapes and are implanted in the flanges 32a, 32b at both ends of the spool 32 with upper ends 41a, 42a and lower ends 41b, 42b protruding.

43 and 44 are a pair of permanent magnets, and 45 and 46 are a pair of upper and lower armatures.

The armatures 45 and 46 are formed by punching a plate-shaped magnetic material into a substantially square shape as shown in FIG. They are arranged in such a way that they are stacked with the core 31 in between. The permanent magnets 43 and 44 are positioned outside both ends 31b and 31c of the core 31 in the axial direction of the coils 33 and 34, and the armatures 45 and 46 are connected by the permanent magnets 43 and 44 to form a movable block. 11. The permanent magnets 43 and 44 are arranged in the same direction, for example, as shown in the figure.
It is magnetized with the upper part as the north pole, and is fitted into bag portions 48 and 49 at both ends of an insulating frame 47 integrally formed with the armature 46. 50, 50 are opposite wall portions 51, 51 in the width direction of the insulating frame 47.
It is a U-shaped groove formed in.

The upper armature mounting portions 470, 470 formed on the insulating frame 47 are surrounded by annular grooves 471, 471 corresponding to each long side of the armature 45, as shown in FIG. Convex portions 472, 472
are formed, and the armature 45 is adhesively fixed onto the protrusions 472, 472 via adhesives 52, 52 applied to the upper surfaces of the protrusions 472, 472 (see Fig. 7). . During bonding, excess adhesive 52 that overflows from above the convex portions 472, 472 is received in the groove 471. The movable block 11 is rotatably supported by the shaft 36 of the electromagnetic block 12 by fitting the shaft into the U-shaped groove 50. The lower surface 45c of the longer side of the armature 45 is in contact with the upper end surface of the trapezoidal portion 54 that is integrally connected to the upper peripheral surface of the shaft body 36, as shown in FIG. ing.

_At the lower end of the _{frame 47} , as shown in FIG.
6 ₂ is integrally formed, and a partition wall portion 57 for electrical insulation between the contact mechanism 100 and the coils 33 and 34 is also integrally formed and also serves as a bottom wall.

Reference numerals 58 and 59 designate wiring boards for connecting external leads, each of which has a conductive pattern portion 61 formed on an insulating plate 60. The lead terminals 41, 42
The respective upper ends 41a, 42a of the external terminals 62, 63 implanted in the terminal base 10 are connected to the lead wires or the wiring boards 58, 59 as in the embodiment.
are electrically connected to each other. On the other hand, each lower end 41b of the lead terminals 41, 42,
42b includes the lead wires 33 of the coils 33 and 34.
a and 34a are connected and fixed by brazing or the like.

64 and 65 are fastening pieces formed on the back cover 13 for attaching the back cover 13 to the base 10.

In the above configuration, the coil 33 is now energized so that one end 31b of the core 31 becomes the S pole and the other end 31
When excited so that c becomes the north pole, the core 31
One end 31b and one side 46a of armature 46
and between the other end 31c of the core 31 and the other side 45b of the armature 45 are in a repulsive state, and conversely, the one end 31b of the core 31 and the armature 4
5 and one side 45a of the armature 46 as well as between the other end 31c of the core 31 and the other side 46b of the armature 46 are in an adsorption state. Therefore, the above movable block 1
1 is rotated counterclockwise about the shaft 36, resulting in the state shown in FIG. 9A, whereby the contacts 28 and 30 are closed. At this time, permanent magnet 4
Since the magnetic fluxes 3 and 44 flow as indicated by the arrows in the figure, the above state is maintained even if the coil 33 is cut off.

Next, if the coil 34, which is wound in the opposite direction to the coil 33, is energized, the attraction/repulsion relationship will be reversed, and the movable block 11 will be rotated clockwise, resulting in the state shown in FIG. 9B. , contacts 28, 30
is opened and the contacts 27 and 29 are closed, and in this case as well, even if the coil 34 is cut off, the above state is maintained.

Here, when the armature 45 is attracted to the lower armature 46 side using the attractive force of the permanent magnets 43 and 44, some of the adhesive 52 applied on the convex portion 472 provided on the insulating frame 47 is , the excess will protrude from the coated surface.
This protruding adhesive 52 flows into the annular groove 471 around the convex portion 472 and is prevented from moving there, so that smooth operation of the movable block 11 is ensured. In particular, since the upper and lower armatures 45, 46 are bonded with the excess adhesive 52 protruding, there is a gap between the armatures 45, 46, or in other words, between the armatures 45, 46 and the core 31.
Since there is no variation in the distance between the two, the operating characteristics become stable.

As described above, the present invention provides an electromagnetic relay that not only allows the upper and lower armatures to be easily bonded using adhesive, but also eliminates the risk of malfunction due to variations in the amount of adhesive applied or sulfur release. can do.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of an electromagnetic relay according to the present invention, FIG. 2 is a front joint view of the same, and FIG. 3 is a perspective view showing a fitting part between a terminal base and a case.
Fig. 4 is an explanatory diagram of the core and armature, Fig. 5 is a partially cutaway side view showing a state in which the fitting portion is filled with sealant, Fig. 6 is an enlarged perspective view of the upper armature mounting section, FIG. 7 is an explanatory view of the joint portion between the pivot portion of the movable block and the upper and lower armatures, FIG. 8 is a perspective view showing the lower surface of the frame, and FIGS. 9A and 9B are explanatory views of the operation. 10...terminal base, 11...movable block,
12... Electromagnetic block, 31... Core, 31a
... Central part of the core, 31b, 31c ... Both ends of the core, 33, 34 ... Coil, 36 ... Shaft, 4
3, 44...Permanent magnet, 45...Upper armature, 45a, 45b...Adsorption piece, 45c...Both pieces, 46...Lower armature, 47...Insulating frame, 52...Adhesive, 471 ...Ditch, 472...
Convex part.

Claims (1)

[Claims] 1. A terminal base, an electromagnetic block fixed to the terminal base and having a substantially H-shaped core with a coil wound around the center thereof, and an electromagnetic block that rotates about an axis perpendicular to the axis of the coil. It comprises a freely supported movable block and a contact mechanism fixed to the terminal base and opened and closed by the rotation of the movable block, and the movable block is arranged vertically facing each other with the core sandwiched therebetween. A pair of substantially square-shaped armatures that are attached to and detached from both ends of the core in the axial direction of the coil, and a pair of upper and lower armatures that are disposed outside of both ends of the core between both ends of the core. a pair of permanent magnets having the same magnetic pole on the side that contacts each armature; an insulating frame that fixes the lower armature and the permanent magnet and is rotatably supported by the electromagnetic block; and the insulating frame. A convex portion whose upper surface is in contact with both pieces of the upper armature connecting the adsorption pieces protruding from the body and adsorbed and desorbed to both ends of the core, and a convex portion surrounding the convex portion. An electromagnetic relay comprising: a groove formed in the insulating frame; and an adhesive interposed between the contact surfaces between both pieces of the upper armature and the convex portion to fix the upper armature to the insulating frame.