JPS61161632A - Electromagnetic 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 (A) Field of Industrial Application The present invention relates to an electromagnetic relay, and particularly to an electromagnetic relay in which a lead piece is positioned within a hollow part of a spool around which a coil is wound.

(B) Summary of the Invention The present invention provides that in conventional electromagnetic relays in which the reed piece is located in the hollow part of the spool, magnetic flux easily leaks from the gap between the reed piece and the spool. The magnetic efficiency is increased by interposing a magnetic material in the magnetic material to prevent leakage of magnetic flux.

(c) Prior art and its problems Conventionally, as this type of electromagnetic relay, for example, as shown in FIG.
The base 3a of the lead piece 3 located inside the coil l
It is known that the lead piece 3 is sandwiched between one ends 4a and 5a of an abbreviated yoke 4.5 facing each other. Note that the other end 4b of the yoke 4.5.

6. Permanent magnet in contact with 5b. The magnetic body 7 is connected to a fixed terminal 8.
9, and fixed contacts 8a, 9.9, which are capable of coming into contact with and separating from the free end portion 3b of the lead piece 3. A magnetic circuit can be formed through each yoke 4, and the yoke 4 is provided with a common terminal (not shown).

However, in conventional electromagnetic relays, the lead piece 3
However, since it is only located in the hollow part 2a of the spool 2, there is a clear space between the reed piece 3 and the spool 2.
The sky leaks from this sunny day.

Magnetic flux did not flow sufficiently through the lead piece 3, resulting in poor magnetic efficiency.

Moreover, the base 3a of the lead piece 3 is only held and held by the ends 4a, 5a of the yokes 4, 5.
Since it is difficult to accurately and firmly position the lead piece 3,
This has the disadvantage that the operating characteristics of each product tend to vary, and the operating characteristics are unstable.

(iv) Purpose of the Invention In view of the above drawbacks, it is an object of the present invention to provide an electromagnetic relay that has excellent magnetic efficiency and uniform and stable operating characteristics.

(E) Structure of the Invention and Effects thereof In order to achieve the above-mentioned object, the electromagnetic relay according to the present invention operates to excite and demagnetize the free end of the lead piece located in the hollow part of the spool around which the coil is wound. In the electromagnetic relay that opens and closes contacts by swinging based on the magnetic field, the lead piece is positioned in the hollow part with a magnetic material interposed therebetween.

Therefore, according to the present invention, since the gap between the reed piece and the spool is filled with a magnetic material, leakage of magnetic flux is eliminated and magnetic efficiency can be improved.

Moreover, since the lead piece can be accurately and firmly positioned within the hollow part using the magnetic material, it is possible to obtain an electromagnetic relay having uniform and stable operating characteristics.

(F) Description of Embodiment An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, in the space formed by the base IO and the resin case 20 fitted and fixed to the base IO,
This is a single stable electromagnetic relay that incorporates internal parts.

That is, a spool 12 having a coil II wound thereon is fixed to the upper surface of the base 10, and a hollow portion 1 of this spool 12 is fixed to the upper surface of the base 10.
An abbreviated magnetic material 14.14 is inserted into the lead I3 by inserting or press-fitting into the lead I3. This magnetic material 14.14 has one end bent outward to facilitate the flow of magnetic flux to a movable iron piece 15, which will be described later. Note that the magnetic material 14.14 is the lead piece 13.
It is not limited to the one that is simply pressed into contact with the hollow part 12a, but may be one that is integrated by welding and then press-fitted into the hollow part 12a.

The lead piece 13 having spring properties and conductivity has its base 13a connected to the common terminal 19, while a precious metal is fixed to the tip of the free end 13b protruding from the spool 12, and the fixed contact 17a .

17b, and a movable iron piece 15 is fixed to the base of the free end 13b.

This movable iron piece 15 is capable of reciprocating between the magnetic poles S and N of a permanent magnet 16 arranged to straddle it, and is located at a position where the S pole of the permanent magnet 6 is closer to the movable iron piece 15 than the N pole. Therefore, due to the magnetic imbalance, the movable iron piece 15 receives a strong attractive force from the S pole of the permanent magnet 16, and always returns to the S pole. l
8a and 18b are coil terminals.

Note that if the case 20 is made of magnetic material,
The magnetic material 14.14 and the case 20 constitute a magnetic circuit, which reduces leakage of magnetic flux and further improves magnetic efficiency. Further, if the spool 12 is provided with a yoke (not shown) similar to the conventional example located outside the coil 12, there is an advantage that the magnetic efficiency is improved as described above.

Next, the operation of this embodiment will be explained.

First, in the case of non-excitation, the movable iron piece 15 is attracted to the S pole side of the permanent magnet 16 due to the return force generated by the magnetic imbalance, and the free end portion 13b, which is a movable contact, closes the fixed contact 17a.

Now, when the coil 11 is excited so that the movable contact 13b of the reed piece 13 becomes the S pole, the movable iron piece 15 becomes the permanent magnet 16.
While being repelled by the S pole of the permanent magnet 16, the movable contact 13b is attracted to the N pole of the permanent magnet 16, and after opening and separating from the fixed contact 17a, the movable contact 13b swings to close the fixed contact 17b.

Then, when the excitation of the coil 11 is cut off, the movable contact 13b of the reed piece 13 is activated by the spring force of the reed piece 13 and the permanent magnet 16.
It opens from the fixed contact 17b due to the suction force from the S pole side, closes the fixed contact 17a, and returns to its original state.

In this embodiment, instead of disposing fixed contacts 8 a and 9 a in the hollow part 2 a of the spool 2 as in the conventional example (see FIG. 2), fixed contacts are arranged in the extending direction of the axis of the spool 12. 17a and 17b, it has the advantage of being thinner than the conventional example.

Note that the electromagnetic relay according to the present invention is not limited to the songle stable type, and for example, a movable iron piece is arranged in the center of a permanent magnet, or the free end 13b of the lead piece 13 is
It may also be a latching type that does not self-reset by providing movable iron pieces on both sides to achieve magnetic balance. Moreover, the magnetic material is not limited to the one in which the magnetic material is interposed on both sides of the lead piece, but it goes without saying that the magnetic material may be interposed only in one side of the lead piece.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of an electromagnetic relay according to the present invention, and FIG. 2 is a sectional view of a conventional electromagnetic relay. 11... Coil, 12... Spool, 12a... Hollow part, 13 Lead piece, 13b... Free end (movable contact), 14... Magnetic material, 17a, 17b... Fixed contact.

Claims (1)

[Claims] (1) In an electromagnetic relay that opens and closes contacts by swinging a free end of a lead piece located in a hollow part of a spool around which a coil is wound based on excitation and demagnetization of the coil, the lead piece is magnetically An electromagnetic relay characterized in that the relay is positioned within the hollow portion with a material interposed therebetween.