JPH0322837Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of the invention The present invention relates to an electromagnetic relay, particularly an electromagnetic relay that has a self-holding function due to magnetic action.

(b) Prior art and its problems Conventionally, when a long cylindrical spool is wound with a coil over its entire length, the cylindrical part bends inward due to the winding pressure of the coil, making it impossible to insert the iron core. A thick center flange was formed integrally with the spool itself to reinforce its strength.

For example, as shown in FIG. 1, a central collar 51 is formed at the center of a long cylindrical spool 50, and a set coil 52a is wound around one end and a reset coil 52b is wound around the other end. In this case, as an electromagnetic relay, movable blocks each having a pair of iron pieces capable of attracting and repelling magnetic pole surfaces 54a, 54b and 55a, 55b at both ends of the iron core 53 inserted into the spool 50 are moved to both ends of the iron core 53. By selectively energizing the coils 52a and 52b, the contact mechanism was configured to open and close via the movable block.

However, in this case, one coil 5
When current is supplied to 2a and 52b, the distance to the magnetic pole face of the iron core 53 is different on the left and right sides, that is, the distance to the magnetic pole face 55a and 55b is long for the set coil 52a, and the distance to the magnetic pole face for the reset coil 52b is long. The distance to 54a, 54b is long, and therefore the magnetic pole faces 54a, 54b and 55 at both left and right ends are far apart.
Comparing the magnetic efficiencies at a and 55b, the farther away has higher magnetic resistance and more magnetic flux leakage, which has the disadvantage of creating imbalance.

(c) Purpose of the invention Therefore, the purpose of the present invention is to provide an electromagnetic relay in which the magnetic efficiencies of the magnetic pole surfaces at both the left and right ends are balanced and the operating characteristics of the movable blocks at both ends are equal.

(d) Structure and effect of the invention In order to achieve the above object, the electromagnetic relay according to the invention has a central flange formed integrally with the spool itself at the center of the spool, and is divided into two by the central flange. It is characterized by having a set coil and a reset coil wound in two layers around each spool.

According to this, when either the set coil or the reset coil is energized, the distances to the magnetic pole surfaces at both ends of the iron core are equal, and the balance of magnetic efficiency is not lost, and the operating characteristics of the movable blocks installed at both ends are also equal. Become.

(E) Description of Embodiments In FIG. 2 and below, the electromagnetic relay according to the present invention generally includes an electromagnet part 1 consisting of a yoke 2, an I-shaped iron core 5, a long cylindrical spool 10, and an iron piece 24.
Movable base 2 having a, 24b and 25a, 25b
Movable blocks 20, 21 consisting of 6, 26, and 4
It is composed of a pole contact mechanism 30, a base 45, and a case 46.

The yoke 2 has a pair of protrusions 3a, 3b, 4a, 4b facing each other in the width direction at both ends, and is fixed to the base 45. The spool 10 is integrally molded from a suitable synthetic resin, and includes a central flange 11 and both end flange 1.
2 and 12, with an iron core 5 inserted through the center,
A coil is wound around the body. The coil is the 6th
As shown in the figure, the set coil 9a is first wound around the central flange 11, and then the reset coil 9b is wound thereon in two layers. Further, the core wires of each coil 9a, 9b are connected to coil terminals 8a, 8b which are press-fitted into the central collar portion 11.

The yoke 2 and the spool 10 are the yoke 2 and the spool 10.
It is integrated by sandwiching the flanges 12, 12 at both ends between the protruding pieces 3a, 3b and 4a, 4b.
At this time, the magnetic pole surfaces at both ends of the iron core 5 are located between the projecting pieces 3a, 3b and 4a, 4b of the yoke 2, and a total of four working gaps are formed between the opposing surfaces.

Movable blocks 20, 21 are permanent magnets 22, 23
There are iron pieces 24a, 24b and 25a on both sides in the magnetization direction.
25b is fixed by a method such as adhesive, and assembled by fitting into the frame 27 of the movable base 26 made of a non-magnetic material such as resin. The movable blocks 20, 21 have arm portions 28, 28 in the recessed portions 12, 12 at both ends.
It is attached so that it can be moved left and right while being positioned at 4 and 14. At this time, the iron pieces 24a, 24b and 25a, 25b located in pairs at each end are used to form the working gap, that is, the magnetic pole faces 6a, 6 at both ends of the iron core 5.
b, 7a, 7b and protrusions 3a, 3b, 4 of yoke 2
It is located in the gap opposite to a and 4b.

On the other hand, the four contact mechanisms 30 are installed on the base 45. That is, fixed terminals 32a, 32b, 37a, 37b have fixed contacts 31a, 31b, 36a, 36b on the base 45, movable contacts 33, 38 at the tips, terminals 35, 40 at the rear end.
Movable contact pieces 34 and 39 are installed, and the movable contact pieces 34 and 39 are fixed to the groove portion 29 of the movable base 26.
mated to.

In the above configuration, when the set coil 9a is first excited, the magnetic pole faces 6a and 6b of the iron core 5 have an N pole,
S poles are excited on the magnetic pole faces 7a and 7b, the movable blocks 20 and 21 move in the directions of arrows a and b, respectively, and the iron pieces 24a and 25a move toward the magnetic pole faces 6a and 6a of the iron core 5, respectively.
7a, and the iron pieces 24b and 25b are attached to the yoke 2.
The movable contacts 33, 38 close the fixed contacts 31a, 37a. Here, even if the excitation of the set coil 9a is canceled, the movable blocks 20 and 21 maintain their state by the magnetic force of the permanent magnets 22 and 23.

On the other hand, when the reset coil 9b is energized, the magnetic pole faces 6a and 6b of the iron core 5 are set to the S pole, and the magnetic pole faces 7a and 7b are set to the S pole.
, the N pole is excited, the movable blocks 20 and 21 move in the opposite direction to the arrows a and b, and the iron piece 2
4b, 25b are attracted to the magnetic pole faces 6b, 7b of the iron core 5, and the iron pieces 24a, 25a are attracted to the protruding piece 3 of the yoke 2.
a, 4a, and the movable contacts 33, 3
8 closes the fixed contacts 31b and 37b. Here, even if the excitation of the reset coil 9b is released, the magnetic force of the permanent magnets 22 and 23 causes the movable blocks 20,
21 maintains that state.

That is, in the electromagnetic relay shown in this embodiment, by energizing the set coil 9a and the reset coil 9b, S and N poles are excited on the magnetic pole surfaces at both ends of the iron core 5, and the movable blocks 20 and 21 move back and forth, and the contacts are closed. Even when the mechanism 30 is operated and its excitation is canceled, it is self-retained by the magnetic force of the permanent magnets 22 and 23.

In this case, since the set coils 9a and 9b are wound in two layers over almost the entire length of the iron core 5,
No matter which coil 9a or 9b is excited, the magnetic resistance and leakage magnetic flux to both end magnetic pole surfaces of the iron core 5 are equal, and the magnetic efficiency at both end magnetic pole surfaces is balanced. Therefore, the movable blocks 2 installed at both ends
The operating characteristics of 0 and 21 are also equal.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of a conventional electromagnetic relay, Fig. 2 and the following show an embodiment of the electromagnetic relay according to the present invention, Fig. 2 is an exploded perspective view, Figs.
Figure 5 is a cutaway plan view of the case, respectively.
The front view, side view, and FIG. 6 are sectional views of main parts. 1... Electromagnet device, 5... Iron core, 6a, 6b,
7a, 7b...Magnetic pole surface, 9a...Set coil,
9b...Reset coil, 10...Spool, 1
1...Central flange, 20, 21...Movable block,
22, 23...Permanent magnet, 24a, 24b, 25
a, 25b...iron piece, 30...contact mechanism.

Claims (1)

[Scope of utility model registration request] A movable block includes an electromagnet with protruding magnetic pole surfaces of an iron core at both ends of a long cylindrical spool wound with a coil, a pair of iron pieces that can attract and repel the magnetic pole surfaces at both ends of the iron core, and the reciprocation of this movable block. In an electromagnetic relay configured with a contact mechanism that opens and closes contacts in conjunction with movement, a central flange is formed integrally with the spool itself at the center of the spool, and each spool is divided into two by the central flange. An electromagnetic relay characterized by having a set coil and a reset coil wound in two layers.