JPS6142833A - 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 [Field of the Invention] The present invention relates to an electromagnetic relay in which a movable block for opening and closing a contact mechanism moves in a direction perpendicular to the longitudinal direction of an iron core.

[Prior art and its problems] Conventionally, a polarized relay, such as the one shown in FIG. 6, is known as an example of an electromagnetic relay. In this figure, magnetic pole surfaces 20a and 20b are set on both sides of one end of an iron core 20, and iron pieces 21a and 21b are opposed to both magnetic pole surfaces 20a and 20b. Permanent magnet 2 facing the magnetic pole end of iron core 20
Reference numeral 2 constitutes a movable block 23 which magnetically connects both iron pieces 21a and 21b and is driven integrally with both iron pieces 21a and 21b. Projecting pieces 24a and 24b, which are part of a yoke (not shown), are both iron pieces 21a.

It faces the magnetic pole faces 20a and 20b of the iron core 20 with 21b in between. A coil 25 is wound around the iron core 20.

1 of electromagnetic blocks 26 consisting of iron core 20 and coil 25
A pair of fixed terminal pieces 27a, 2 are mounted on a fixed base (not shown).
7b is fixed, and the proximal ends of a pair of movable contact pieces 28a, 28b are fixed to each terminal piece 27a, 17b.
a and 28b are adjacent.

In the above configuration, when the movable block 23 is returning in the direction of the force indicated by the arrow AI in FIG.
0 magnetic pole face 20b. When the coil 25 is excited, a magnetic flux in the opposite direction to the magnetic flux generated by the permanent magnet 22 is generated in the coil 25, the other iron piece 21a is attracted to the magnetic pole face 20a of the iron core 20, and the movable block 23 moves in the direction of arrow A2. As a result, the state shown in FIG. 6 is reached. From this coil 2
5 is reversely excited, the movable block 23 returns to the state shown in FIG.

In conjunction with the movement of the movable block 23, the movable contact piece 2
8a, 28bcr+contacts 29a, 29b move toward and away from stationary contacts 30a, 30b and 31a, 31b disposed opposite to the movable contact piece 28a.

The opening/closing operation of 28b is performed.

During this moving process of the movable block 23, the movable contact piece 28
The relationship between the load applied to the movable block 23 by a and 28b, the operating voltage for driving the movable block 23 by the electromagnetic block 26, and the return voltage has the characteristics shown in FIG.

xl is the load characteristic due to the movable contact pieces 28a and 28b;
Y indicates the operating voltage characteristic of the electromagnet block 26, and Z indicates the return voltage characteristic of the electromagnet block 26.

That is, as shown in FIG. 5, the movable contacts 29a, 29
In a state where b is in contact with fixed contacts 30a and 30b,
Movable contacts 29a, 29 relative to fixed contacts 30a, 30b
To obtain a contact pressure of b.

The movable block 23 has movable contact pieces 28a and 28b.
The AI force direction load tube fJ, a l is acting accordingly. Therefore, in order to drive the movable block 23 in the A2 direction, an operating voltage higher than the load characteristic X1 must first be applied to the electromagnetic block 23 to overcome the load al and as shown by the characteristic Y. No.

Next, move the movable block 23 from the state shown in FIG.
To return to the force direction, the load cylinder fIL is changed from the operating voltage b1.
c Reduce the return voltage d1 to less than 1, and change the load load characteristic
A return voltage of characteristic 2 lower than i must be applied.

However, the characteristic x1 is a combination of the spring load characteristics X2 of the pair of movable contact pieces 28a and 28b of the same length, and this load characteristic XI is too high than the operating characteristic Y in the region m. In addition, since the return characteristic Z is too low in the region n, the movement block 23 is inoperative both in operation and return.

Therefore, the operating voltage characteristic Y is increased and the return voltage characteristic Zt
-If it is decreased, the difference between both characteristics Y and Z becomes larger,
It has the disadvantage that the rated value cannot be obtained.

In order to improve this drawback, an auxiliary spring (not shown) was added to the
In addition to the 7-movement block 23, if the load characteristic Xi is located between the operating voltage characteristic Y and the return voltage characteristic Z, not only the number of parts increases, but also the relay becomes larger and the work becomes more difficult. It has disadvantages such as deterioration of sexual quality.

, [Object of the Invention J This invention was made in order to eliminate the above-mentioned drawbacks,
It is an object of the present invention to provide an electromagnetic relay with stable operation whose load characteristics can be easily adjusted and whose load characteristics can be positioned between rated operating voltage characteristics and return voltage characteristics.

[Configuration and Effects of the Invention] The electromagnetic relay according to the present invention includes an electromagnetic block fixed to a base and consisting of an iron core and an electromagnetic coil; The contact mechanism includes a movable block that moves in the direction, and a contact mechanism that cantilever-supports a plurality of movable contact pieces that are opened and closed by the movement of the movable block. It is constructed by supporting each movable contact piece in a cantilevered manner with different lengths.

As described above, by varying the length between the support part of the movable contact piece and the contact point and supporting each of the movable contact pieces in a cantilever manner, one of the movable contact pieces is given the same load characteristics as before. Even in the case of By interposing the load characteristic between the and the return voltage characteristics, it is possible to improve the operating voltage characteristics and the return voltage characteristics.

[Explanation of Examples] Embodiments of the present invention will be described below with reference to the drawings.

Fig. fJS1 is an exploded perspective view showing an example of the electromagnetic relay according to the present invention as a polarized relay, and Fig. 2 is a partially cutaway plan view of the assembled state.

This relay is roughly divided into electromagnetic blocks 1. Movable block 2. It is composed of a contact mechanism 3, a case 4, and a base 12.

The rod-shaped iron core 5 of the electromagnet block l is inserted into the center hole 6a of the spool 6 formed of synthetic resin, and the yoke 7
It is fixed to the rear end upright protrusion 7a. Further, an electromagnetic coil 8 is wound around the body 6b of the spool 6 shown in FIG. The movable block 2 is located within the frame 9a of the movable base 9.
The pair of iron pieces lOa and lOb, both iron pieces 10a, and a permanent magnet 11 magnetically connected between one end of the fob are fixed, and the movable base 9 is mounted on the base 12 in the direction indicated by the arrow A I in FIG.
A It is installed movably in two directions, and furthermore, the iron piece 10a
, lOb is the magnetic pole face 5a set on both sides of one end of the iron core 5.
, 5b, the permanent magnets 11 are arranged opposite to the magnetic pole end faces 5c of the iron core 5, as shown in FIG.
The front end upright projecting pieces 7b and 7c are arranged opposite to each other between the iron pieces 10a and lOb.

On the other hand, the contact a structure 3 has one set installed on each side of the base 12, and as shown in FIG.
A movable contact piece 15a is supported in a cantilevered manner by the fixed terminal pieces 14a and 14b with the angle b.

15b, fixed contacts 16a, 16b and 17a, 17
Fixed contact pieces 18a, 18b and 19a, l that accommodate b
'9b, and the length La between the support part 14c and the contact 13a in one movable contact piece 15a is shorter than the length Lb between the support part 14d and the contact 13b in the other movable contact piece 15b. and each of these movable contact pieces 1
5a and 15b are inserted and locked into a groove 9C formed in the arm 9b of the movable base 9. Further, the case 4 is fitted onto the base 12 and covers the electromagnet block 1, movable block 2 and contact mechanism 3 on the base 12.Next, the operation of the above structure will be explained.

Fig. fJS3 shows the return state, and in this state, the magnetic flux of the permanent magnet 11 is the iron piece 10b - iron core 5 - yoke 7 - iron piece 10.
Form a loop through a. As a result, the iron piece 10b is attracted to the magnetic pole face 5b of the iron core 5, and the movable block 2 is held at the return position. At this time, the movable contact pieces 15a, 15b are bent by the movable block 2, and the movable contacts 13a, 13
b comes into contact with fixed contacts 16a and 16b.

:1IJ3 When the coil 8 is excited in the state shown in Fig. 3, the magnetic flux in the opposite direction to the magnetic flux caused by the permanent magnet 11
The iron piece 10a is attracted to the magnetic pole face 5a of the iron core 5. That is, as shown in FIG. 4, the Of moving block 2 moves in the direction of arrow A2, and the movable contacts 13a, 13b switch to and contact the fixed contacts 17a, 17b. In the state shown in FIG. 4, when the coil 8 is energized in the opposite direction, the movable block 2 returns to the direction of the arrow AI shown in FIG.

Now, if the load applied by the movable contact piece 15b is set to have the characteristic x2 similar to the conventional one as shown in FIG. As shown in , since the load characteristic x2 is higher than that of the movable contact piece 15b,
The combined load characteristics of 5a and 15b are the operating voltage characteristics Y and the return voltage characteristics Z, as shown by the characteristics x4 in FIG.
It can be located between.

As described above, the support portion 14a of the movable contact pieces 15a, 15b
,' Lengths La and L between L4b and contacts 13a and 13b
By cantilever-supporting the movable contact pieces 15a and 15b with different values b, even when one movable contact piece 15b is given the same load characteristic x2 as before, the length of the other movable contact piece 15a is By adjusting the spring load characteristic X3 by adjusting the length La, the combined load characteristic x4 by adjusting the length La of the movable contact piece 15a is locally increased, and! h Operating voltage characteristics Y,! : The above-mentioned load characteristic x4 is interposed between the return voltage characteristic Z, and thus,
The operating voltage characteristic Y and the return voltage characteristic Z can be maintained at their rated values.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of the electromagnetic relay according to the invention, FIG. 2 is a schematic plan view of the assembled state shown in FIG. 1, and FIGS. 3 and 4 are schematic plan views for explaining the operation of the invention. , FIG. 5 and FIG. 6 are schematic plan views for explaining the conventional operation, and FIG. 7 is a characteristic diagram for explaining the relationship between the spring load characteristics and the operation and return voltage characteristics in the present invention and the conventional example. be. l...electromagnetic block, 2...movable block, 3.
... Contact mechanism, 5 ... Iron core, 8 ... Electromagnetic coil, 1
2...Base, l3a, 13b...Contact, 14c, 14d...Support part, 15a, 15b...
- Movable contact piece, Ll. L2... Length of movable contact piece. Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) An electromagnetic block fixed to a base and consisting of an iron core and an electromagnetic coil, a movable block that is attracted to the iron core by excitation of the electromagnetic coil and moves in a direction perpendicular to the longitudinal direction of the iron core, and this movable block a contact mechanism formed by cantilever-supporting a plurality of movable contact pieces that are opened and closed by the movement of the movable contact pieces; An electromagnetic relay characterized by being cantilever-supported.