JPH01197932A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To use an electromagnetic relay for opening or closing a high load by applying the plating of a good conductor to at least the lead-out section of a T-shaped connecting piece. CONSTITUTION:A current is applied to the right and left coils 27 via coil terminals 14, the direction is switched to excite an iron core 20, thus an armature block 3 is swayed in the arrow (a) or (a') direction using the contact point between a recess groove 29a and a projection 37 as a fulcrum, and a movable contact 32 is contacted or separated from a fixed contact 13a. A common terminal 12 and a fixed contact terminal 13 are made conductive via a movable contact piece 31 and a T-shaped connecting piece 33 by the contact or separation of these contacts, and a load is opened or closed. The lead-out section 34 of the connecting piece 33 is formed fine to the degree not to impair the swaying operation of the armature block 3, but its surface is plated with a good conductor. The limiting current density is thereby increased, and this electromagnetic relay can be used for opening or closing a high load.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic relay that opens and closes contacts by swinging an armature block.

(Prior Art) Conventionally, as one aspect of the electromagnetic relay, an electromagnetic block is provided, in which a fill is wound through a spool around an iron core bent in a substantially U-shape and forming a pair of opposing magnetic pole pieces at both ends; A permanent magnet is interposed between the magnetic pole pieces, and the parts facing the magnetic pole pieces are respectively magnetized to the same polarity, while the intermediate part is magnetized to the opposite polarity, and both ends are respectively opposed to the magnetic strips. In addition, an armature block having a protrusion provided approximately in the center and swingably supported in a groove provided in the center of the permanent magnet is housed in a housing consisting of a base and a case. , was retired due to Japanese Patent Application Laid-Open No. 61-2+8030.

In this device, movable contact pieces are provided on both sides of the armature block and supported at the center, and movable contacts are provided at both ends of each movable contact piece so that they can come into contact with and separate from the fixed contact on the base. A T-shaped connecting piece consisting of a lead-out part and a wing part is provided in the center of the movable contact piece and projects laterally, and the movable contact piece and the terminal of the base are electrically connected through the connecting piece. It has become.

(Problem to be Solved by the Invention) However, in the conventional electromagnetic relay described above, the armature block is supported so as to be swingable simply by the convex-concave fitting of the protrusion and the concave groove, and the armature block is supported by the T-shaped connecting piece. The connecting piece is extremely thin so as not to interfere with the rocking motion or the flow of current. For this reason, there was a problem that the limiting current density was small and it was not suitable for high-load switching applications.

The present invention has been made in view of such problems, and aims to provide an electromagnetic relay that can be used for high-load switching even if it has a thin T-shaped connecting piece that connects a movable contact piece and a terminal. purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an armature block in which movable contact pieces are supported at the center on both sides of the armature, and are mounted on an electromagnetic block assembled to a base. Each movable contact piece is supported in a swingable manner, and a T-shaped connecting piece consisting of a lead-out portion and a wing portion is protruded from the center of each movable contact piece, and the movable contact piece and the terminal provided on the base are connected via the connecting piece. In the electromagnetic relay electrically connected to the T-shaped connecting piece, at least the lead-out portion of the T-shaped connecting piece is plated with a good conductor.

(Function) According to the above configuration, even if the lead-out portion of the single-shaped connecting piece is thin, surface current flows through the plated portion of the good conductor, so that the limiting current density increases as a whole.

(Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an electromagnetic relay, and this electromagnetic U-electric device roughly consists of a base 1. Electromagnetic block 2. Armature block 3. and case 4.

1. Outline configuration The configuration of each part will be explained below.

('1) Base! The base l is made of insulating synthetic resin, and the base body I
A housing portion 11 that is open upward is formed in the housing portion 11, and groove portions 10a, 10b, 1 are formed in the vertical direction on both sides in the long side direction.
0b, 10c, and 10c are formed, respectively.

The grooves 10b and IOc are distributed symmetrically to the left and right around the groove 10a, and the grooves 10a, 10b, 10
C has a common terminal 12. Fixed contact terminal 13. The lead portions of the coil terminals 14 are located at respective positions.

The upper part of each terminal 12, 13, 14 is embedded and integrated into the base body 10, and the tip contact portions 12a, 12a of the common terminal 12 are formed approximately at the center in the long side direction of the main body 10. The fixed contacts 13a of the fixed contact terminals 13 are exposed on the upper surface of the pedestal 15 formed at the four corners of the accommodating portion 11, and the contact portions 14a of the coil terminals 14 are exposed on the upper surface of the pedestal 15. They are formed on the inside in the short side direction and are exposed at the bottoms of recesses 16 that are lower than the base portion 15, and on the back side of the coil terminal contact portions 14a are welding electrode insertion holes that communicate with the outside of the base body IO. Guide section 17
is formed.

(11) Electromagnet block 2 The electromagnet block 2 roughly consists of an iron core 20. Spool 23.
Coil 27. It is composed of a permanent magnet 28.

As shown in FIG. 3, the iron core 20 is formed by bending both ends of a rectangular plate made of magnetic material upward to form magnetic pole pieces 21a and 21b facing each other on both sides of the iron core body 22, and one magnetic pole piece 21a. The upper end portion of the iron core body 22 is further bent outward to form a horizontal portion 21c that is substantially parallel to the core body 22.

The permanent magnet 28 has a rectangular shape with magnetic poles formed on the upper and lower sides, and is arranged approximately at the center of the core body 22.

The spool 23 is attached to the core 20 so as to cover the core body 22.
It is integrally formed with the flange portions 24 and 24 at both ends.
is formed, and a holding part 29 which also serves as a flange part is formed between these, and the permanent magnet 28 is integrally held in the holding part 29 with its upper part exposed. On the upper surface and on both end sides of the iron core 20, grooves 29a having a semicircular cross section in the longitudinal direction of the iron core 28 are provided as bearing parts.
29a is formed.

The coils 27 are wound between the flanges 24, 24 and the holding portion 29, respectively, and the ends are electrically connected to the coil winding portions 26 of the relay terminals 25 integrally formed on the flanges 21, 21, respectively. It is connected.

(iii) Armature block 3 The armature block 3 includes the armature 30. Movable contact piece 31.3
1. It is composed of a support section 36.

The armature 30 is a rectangular plate made of a magnetic material, and the movable contact piece 31 has so-called twin structure contact grooves on both ends, each having a movable contact 32, and a central part extending laterally to lead out. The movable contact piece 31 has a T-shaped contact connecting piece 33 which has a T-shaped contact connecting piece 33 whose tip extends on both sides along the armature 30 to form wing parts 35 and 35. The armature 30 is supported by insulating support parts 36 made of synthetic resin and arranged parallel to both sides in the long side direction of the armature 30.
is integrated into. However, in the integrated state, the 'r-shaped connection piece 33 protrudes from the side of the support part 36.

The narrowest part of the lead-out part 34 of this T-shaped connecting piece 33 is a plated part M plated with a good conductor such as silver or gold.

As shown in FIG. 3, on both sides of the lower surface of the support part 36,
Corresponding to the concave grooves 29a, 29a of the electromagnet block 2, the tip portion is shaped with a radius smaller than the concave 17429a.
There are protrusions 37, 37 formed in a circular cross section, and the height of the protrusions 37, 37 is equal to that of the groove 29a.

29a, a slight gap is created between the lower surface of the armature center t430a and the upper surface of the permanent magnet 28.

(iv) Case 4 Case 4 is made of synthetic wood and has a box shape that can be attached to base 1.

■The assembly of an electromagnetic relay consisting of one or more assemblies will be explained.

First, in FIG. 2, the electromagnetic block 2 is attached to the housing part 11 of the base l. In this state, electromagnet block 2
The relay terminal 25 is connected to the base body I as shown in FIG.
It is located on the coil terminal connecting portion 14a of the coil terminal O. However, in this embodiment, as shown in FIG.
The height from the bottom of 4 to the bottom of relay terminal 25 (hυ is
Since it is set slightly higher than the height (h2) from the bottom surface of the housing section 11 to the top surface of the coil terminal contact section 14a,
The relay terminal 25 and the contact portion 14a are separated from each other.

Therefore, one electrode of a welding machine (not shown) is inserted upward from the guide part +7 (see FIG. 2) and comes into contact with the lower surface of the coil terminal contact part 14a, and the other electrode is inserted into the upper surface of the relay terminal 25. While the relay terminal 25 is elastically deformed and pressed against the coil terminal contact portion 14a, the two are welded and integrated.

Therefore, due to the restoring force of the relay terminal 25 itself, the electromagnet block 2 is firmly fixed while being pressed against the base 1.

Note that when welding the relay terminal 25 and the contact portion 14a using a laser or the like, the terminal 25 and the contact portion 14a are overlapped with the electromagnet block 2 mounted on the base I. Further, the guide section 17 is not necessary.

Next, as shown in FIG.
7 is positioned in the concave groove 29a of the electromagnet block 2, and the armature block 3 is supported so as to be swingable in the directions of arrows a and a' using the contact point between the concave groove 29 and the protrusion 37 as a fulcrum.

Both ends of the armature 30 are connected to the magnetic pole piece 21 of the electromagnet block 2.
a, 21b, and there is a working space S between them.
, S are formed, and based on the magnetic force of the permanent magnet 28, the permanent magnet 28. A magnetic circuit connecting the 20° iron core and the armature 31 is formed.

As shown in FIG. 1, the single-shaped connecting piece 33 of the movable contact piece 31 has its wing portions 35 and 35 connected to the common terminal contact portion 12a, respectively.
, 12a, and the movable contact 32 faces the fixed contact 13a, and as shown in FIG. 3, when the armature block 2 is operated in the direction of arrow a (a'), ) are in contact with the fixed contact 13a, while the left (right) contacts 32 and 13a are spaced apart to form an action space S.

Next, the tip sides of the wing portions 35.35 of the single-shaped connecting piece 33 are welded to the connecting portions 12a and +2a, respectively, to electrically connect the two.

In addition, in the single-shaped connecting piece 33, the lead-out portion 34 is thin;
In addition, the wing portion 35 has a semicircular notch 34 at its root.
'a (see FIG. 1) is formed, the torsional resistance of the lead-out portion 34 and the bending rigidity of the root of the wing portion 35 are small, and the swinging motion of the armature block 3 can be performed smoothly.

Finally, the base l with the internal components installed as described above.
A case 4 is mounted on the outside, and a resin 5 is filled between the base l and the case 4 to seal it.

(2) Operation The operation of the electromagnetic relay formed as described above will be explained.

In a non-excited state where no current is applied to the coil terminal 14, between the magnetic pole pieces 21a and 2tb of the iron core 20, the magnetic pole piece 21a has a larger opposing area with the armature 3I, which disrupts the left and right magnetic balance. Therefore, the armature 31 is
The state shown in FIG. 3 is maintained by moving in the direction shown in FIG.

By applying a current to the left and right coils 27, 27 via the coil terminal 14, and by switching the direction to excite the iron core 20, the armature block 3 is connected to the groove 29a, as shown in FIG. The movable contact 32 swings in the direction of the arrow a or a' with the contact point with the protrusion 37 as a fulcrum, and the movable contact 32 is connected to the fixed contact 1.
Contact and separate from 3a.

By connecting and disconnecting these contacts, the common terminal 12 and the fixed contact terminal 1
3 are electrically connected via the movable contact piece 31 and the T-shaped connection piece 33, and the load is opened and closed. At this time, the lead-out portion 34 of the connecting piece 33 is formed to be thin enough not to interfere with the swinging movement of the contact terminal block 3 as described above, but the lead-out portion 34 of the connecting piece 33 is formed to be thin enough not to interfere with the swinging movement of the contact terminal block 3, but the lead-out portion 34 is formed on the plated portion M of a good conductor such as silver applied to the surface of the lead-out portion 34. Because surface current flows,
Even if it is thin, it has a large limiting current density and can perform high load switching.

(Effects of the Invention) As is clear from the above description, according to the present invention, a T-shaped connecting piece having a thin lead-out portion that connects the movable contact piece of the contact block and the terminal of the base is plated with a good conductor. This has the effect of increasing the limiting current density and allowing it to be used for high-load switching.

[Brief explanation of the drawing]

1 to 4 show an electromagnetic uIX device according to the present invention, FIG. 1 is a plan view, FIG. 2 is an exploded perspective view, and FIG. 3 is a first
FIG. 4 is a sectional view taken along line 1--1 in FIG. 1, and FIG. ■... Base, 2... Electromagnet block, 3... Armature block, 12... Common terminal, 12
a... Contact portion, 30... Armature, 31...
...Movable contact piece, 33... Connection piece, 34... Derivation part, M... Plating part.

Claims (1)

[Claims] (1) An armature block with movable contact pieces supported at the center on both sides of the armature is swingably supported on an electromagnet block assembled to the base, and a lead-out portion is provided at the center of each movable contact piece. An electromagnetic relay in which a movable contact piece and a terminal provided on a base are electrically connected via a protruding T-shaped connecting piece consisting of a wing and a movable contact piece and a terminal provided on a base, wherein at least one of the T-shaped connecting pieces An electromagnetic relay characterized by having the lead-out part plated with a good conductor.