JPH052970A - Polar relay - Google Patents

Abstract

PURPOSE:To prolong the contact lifetime of a relay and enhance the response characteristics and reliability by shifting the armature rotating center to near one end, installing a permanent magnet in this direction of shifting, and elongating the effective length of a contact spring. CONSTITUTION:At one end of a relay armature 26, a permanent magnet 29 is installed which is to restitute the armature 26 when energization is shut off for an energization coil 23 wound on a core 21 in its center. A rotational fulcrum 22a for armature rotating relative to the core 21 is provided in the neighborhood of the permanent magnet 29, Thereby the distance between the fulcrum 22a and the other end of armature 26 can be set longer. That is, the ratio of the effective length of a contact spring 32b to the overall length of the relay can be set larger, which ensures the contact motions, prolongs the contact lifetime to a great extent, and allows enhancing the response in motions and also the reliability.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a polarized relay incorporating a permanent magnet.

[0002]

2. Description of the Related Art An exciting current is passed through an exciting coil wound around a core to magnetize the core, and the armature is rotated by this magnetic force to urge a contact spring to open and close the contact to generate an exciting current. A latch-type polarized relay that maintains its operating state even after being cut off is configured, for example, as shown in FIG. 4 (JP-A-57-15327).

A bottom portion 1 of a core 1 having a substantially U-shaped cross section.
A permanent magnet 2 having S and N poles is fixed to the center of a. An intermediate point of a rod-shaped armature 3 is rotatably attached to a free end 2a of the permanent magnet 2 which is an N pole. Exciting coils 4a and 4b are wound around the bottom 1a of the core 1 on both sides of the permanent magnet 2, respectively. Also,
Contact springs 5a and 5b extending in the respective free ends 3a and 3b are attached to the center of the armature 3.

In such a polarized relay, when no exciting current is applied to the exciting coils 4a and 4b,
Each free end 7a, 7b of the core 1 is magnetized to the N pole by the permanent magnet 2. Similarly, each free end 3a, 3b of the armature 3 is magnetized to the S pole. Then, since both free ends attract each other, the armature 3 maintains the equilibrium state, but since this state is unstable, the armature 3 tilts to either one and one of the free ends is attracted. It stabilizes in the condition.

When a direct current is applied to the exciting coils 4a and 4b, the core 1 is strongly magnetized according to the direction of the current. Therefore, the armature 3 rotates in the magnetized direction. As a result, one of the contact springs 5a (5b) is inclined and comes into contact with the fixed contact located below. Next, when the exciting current is cut off, the magnetic force of the permanent magnet 2 causes the armature 3 to maintain its operating state.

When the exciting coils 4a and 4b are excited in the opposite directions, the free ends that have been attracted to each other repel each other, so that the armature 3 tilts in the opposite direction and the opposite free ends attract each other. .. Then, even if the exciting current is cut off, the operating state is maintained by the magnetic force of the permanent magnet 2.

However, in such a polarized relay, since the permanent magnet 2 is directly fixed to the bottom portion 1a of the core 1, it is necessary to divide the exciting coils 4a and 4b into two windings. The manufacturing process becomes complicated. Further, the number of turns of the exciting coils 4a and 4b has a certain limit due to its shape, and a strong magnetic force cannot be obtained. FIG. 5 is a view showing another polarized relay using the same permanent magnet, which solves the above-mentioned problems (Japanese Patent Publication No. 56-22099).

In this polarized relay, the exciting coil 9 is wound all over the bottom 8a of the core 8. Then, the two ends of the permanent magnet 10 having a substantially rectangular cross section, which are the S poles, are fixed to the side walls on both sides inside the core 8. The armature 11 is attached to the apex formed by the N pole of the permanent magnet 10.
The intermediate point of is rotatably attached. The contact springs 12a and 12b are attached to the center of the armature 11.

The polarized relay thus constructed has the same operating principle as the polarized relay shown in FIG. In this polarized relay, the permanent magnet 1 is attached to the bottom 8a.
Since 0 does not abut, the volume occupied by the exciting coil 9 can be set larger than that in the case of FIG. 4, and one exciting coil 9 can be used. Therefore, a strong magnetic force is obtained.

However, in the polarized relay shown in FIG. 5, the permanent magnet 10 having a substantially rectangular cross section is used. In this case, a special magnetizing device is required to obtain a permanent magnet by magnetizing the two ends of the bottom of the substantially rectangular cross section as the S pole and the apex as the N pole. Then, it is necessary to incorporate it into a polarized relay in a state where it is magnetized in advance. That is, the manufacturing process cannot be simplified so much.

[0011]

Further, the polarized relays shown in FIGS. 4 and 5 have major common problems in addition to the problems described above.

That is, generally, in each of the parts constituting the relay, the parts which deteriorate the fastest and determine the life of the entire relay are the contact and the contact spring supporting the contact. Therefore, it is preferable that the contact pressure is constant when the contact contacts the fixed contact when the contact spring is pressed, and that the sliding phenomenon is suppressed to the minimum when the contacts are in contact with each other.

To meet this condition, the contact spring length L
Is better to be longer. That is, as shown in FIG. 6A, when the distance La from the fixed fulcrum to the contact is long, the contact of the contact spring is urged substantially perpendicularly to the fixed contact which is vertically opposed. It will be. As a result, it is possible to minimize the sliding phenomenon that occurs between the contacts after they come into contact with each other.

On the other hand, as shown in FIG. 6B, when the length Lb of the contact spring is short, the contact of the contact spring contacts the fixed contact while drawing an arc. Therefore, even after the contacts are brought into contact with each other, the contacts of the contact spring move not only in the vertical direction but also in the horizontal direction with respect to the fixed contact. Therefore, a large sliding phenomenon occurs between the contacts.

In the polarized relay shown in FIGS. 4 and 5, however, the intermediate points of the armatures 3 and 11 are rotatably supported by the free ends and the apexes of the N poles of the permanent magnets 2 and 10, respectively. Each contact spring 5a, 5b, 12a,
The length L of 12b is at most 1 of the length of the armatures 3 and 11.
/ 2. Therefore, each contact is worn in a short period of time and the life of the entire polarized relay is shortened.

In order to compensate for such instability of the contact operation, it is necessary to increase the amount of movement of the card at the time of energization / interruption so that the contacts can be reliably brought into contact with each other. Therefore, it is necessary to set a large magnetic gap G (working gap) between the free end of the core and the free end of the armature. However, if the magnetic gap G is set to be large, it is necessary to increase the magnetic forces of the cores 1 and 8 during excitation,
In addition, there is a concern that the response characteristics of the operation may deteriorate.

In particular, in recent years, various relays incorporated in electronic circuits have been required to be further miniaturized, and the length of each contact spring tends to be further shortened. Therefore, extending the contact life is an important issue. ..

Further, since the armatures 3 and 11 are rotatably supported by the permanent magnets 2 and 10 at their center portions, the rotation moment of the armatures 3 and 11 is small and the excitation coils 4a, 4b and 9 are energized.・ The response operation to the cutoff operation becomes unstable. Therefore, there remains a problem in operation reliability.

The present invention has been made in view of the above circumstances, and the armature length is improved by moving the center of rotation of the armature to the vicinity of one end of the armature and disposing the permanent magnet in the moving direction. The ratio of the effective length of the contact spring to can be significantly increased, and the absolute length of the contact spring can be set to be long, and the contact life can be greatly extended.
And it aims at providing the polar relay which can improve the reliability of operation.

[0020]

In order to solve the above problems, in a polarized relay of the present invention, a long core, an armature provided substantially parallel to the core, and an armature provided near one end of the armature are provided. And a rotation shaft that rotatably supports the armature with respect to the core around the rotation fulcrum, and is attached to the one end side from the rotation fulcrum of the armature. The one end is attached to one end of the core. A permanent magnet that rotates so as to be biased, and a permanent magnet that is wound around the center of the core and responds to energization to the armature, and the other end of this armature attracts the other end of the core against the biasing force of the permanent magnet. The excitation coil that is rotated so as to rotate, a contact spring that is fixed to one side and that is arranged substantially parallel to the core, and is attached near the other end of the armature. Those having a card biasing the reason vicinity of the end.

[0021]

With the polarized relay configured as described above, a permanent magnet that returns the armature to its original state when the excitation of the exciting coil wound around the center of the core is cut off is provided at one end of the armature itself. Installed on. Further, a rotation fulcrum for rotating the armature with respect to the core is provided near one end where the permanent magnet is attached.

Therefore, the distance from the pivot of the armature to the other end (free end) can be set long. As a result, the length of the contact spring can be set longer. That is, the ratio of the effective length of the contact spring to the entire length of the relay can be set large. If the effective length of the contact spring can be increased, the contact operation is ensured and the contact life is extended as described above.
Further, the magnetic gap (working gap) between the armature and the core can be set small.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 2 and 3 are assembled and exploded perspective views showing the configuration of the polarized relay of the embodiment. 2 (f) and 3 (f)
Indicate the same assembled state.

As shown in FIG. 2 (b), the coil bobbin 2 is attached to the core 21 having an I-shaped cross section shown in FIG. 2 (a).
2, the exciting coil 23 is wound around the coil bobbin 22 as shown in FIG. Both ends 21a and 21b of the core 21 are exposed from the coil bobbin 22,
A plastic support block 24 is attached to one end 21a of the exposed core 21. Coil terminals 25a and 25b are fixed to the support block 24 by penetrating.

FIG. 2 (e) shows an armature 26 having a 0-shape, and as shown in FIG. 2 (f), it is shown in FIG. 1 attached to the lower surface of the coil bobbin 22 on the side of one end 26a of the armature 26. Groove 27 that supports the rotating shaft 22a
The bearing portion 27 in which a is formed is attached. Also, near the other end (free end) 26b of the armature 26, cards 28a, 28b for pushing down a pair of contact springs 32a, 32b arranged below are attached.

FIG. 2D shows a permanent magnet 29. Then, the permanent magnet 29 is attached to one end 26a of the armature 26 with the cards 28a, 28b and the bearing 27 shown in FIG. 2 (f) attached, and the core shown in FIG. 2 (c) from above. 21 and a coil bobbin 22 fitted with an excitation coil 23.

FIG. 3 (g) shows a yoke 3 having a J-shape.
It is 0. The yoke 30 and the pair of contact springs 32a and 32b shown in FIG. 3 (i) are fixed to the contact support block 31 as shown in FIG. 3 (h). Below the contact support block 31, contact terminals 31a and 31b connected to the contact springs 32a and 32b are attached.

Further, FIG. 3 (k) shows a base 33 made of, for example, a plastic material, to which the contact terminals 34a and 34b of the upper fixed contacts are attached. Then, the contact support block 31 in which the yoke 30 of FIG. 3 (h) is attached to the base 33, the coil bobbin 22 described above, and the armature 2 of FIG. 3 (f).
When 6 is incorporated, the state shown in FIG. And
The polarized relay assembled as shown in FIG.
As shown in (n), the cover 35 is covered. Figure 1 (a)
FIG. 4 is a side view showing a state in which a base 33 shown in FIG. 3 (k) is further removed from the polarized relay in which the cover 35 shown in FIG. 3 (m) is removed.

In FIG. 1A, one end of the yoke 30 is attached to the one end 21a side of the core 21, and the free end 3 of the other end is attached.
0b faces the other end 21b of the core 21. The armature 26 is interposed between the core 21 and the yoke 30. The bearing portion 2 attached to the armature 26
A rotating shaft 22a attached to the coil bobbin 22 is engaged with the shaft 7. Therefore, the armature 26 rotates about the rotation shaft 22a. One end 26 of the armature 26
A permanent magnet 29 is attached to the a side, and the permanent magnet 29 faces one end 21 a of the core 21.

In the state where the exciting current is not applied to the exciting coil 23, the armature 26 keeps the permanent magnet 2
It is urged clockwise by the magnetic force of 9. And
The free end 26b of the armature 26 is in contact with the free end 30b of the yoke 30, and the other end 21 of the core 21 in this state is
A magnetic gap (working gap) G exists between b and the free end (other end) 26b of the armature 26.

Below the yoke 30, the contact support block 3 is provided.
1 is provided with a contact spring 32b supported on one side, and the fixed contacts 36 and 37 face the respective contacts mounted on the upper and lower surfaces of the contact spring 32b in the vicinity of the free end thereof. The operation of the polarized relay configured as described above will be described with reference to FIGS.

First, when the exciting coil 23 is not excited, as shown in FIG.
Is urged clockwise by the magnetic force of the permanent magnet 29 about the rotating shaft 22a, so that the armature 2
A magnetic gap G is formed between the free end 26 a of No. 6 and the other end 26 b of the core 21. Therefore, the lower end of the card 28b pushes the contact spring 32b downward. as a result,
The lower contact of the contact spring 32b is in contact with the lower fixed contact 37.

In this state, the exciting coil 23 of the coil bobbin 22 is connected to the core 21 via the coil terminals 25a and 25b.
When one end of the core 21 is excited with the same polarity as that of the permanent magnet 29, the core 21 is magnetized and the armature 26
Rotates counterclockwise about the rotation shaft 22a. Then, as shown in FIG. 1B, the free end 26 b of the armature 26 is attracted to the other end 21 b of the core 21. As a result, the lower end of the card 28b is separated from the contact spring 32b.
Then, as the card 28b rises, the contact spring 32b is lifted by the locking portion 28d provided at the lower end. Therefore, the lower contact of the contact spring 32b is released from the lower fixed contact 37, and the upper contact contacts the upper fixed contact 36.

Next, when the exciting current is cut off, the magnetic attraction force of the core 21 disappears and the magnetic force of the permanent magnet 29 causes the armature 26 to rotate clockwise about the rotation shaft 22a, as shown in FIG. The original state shown in (a) is restored.

In the polarized relay having such a structure,
A permanent magnet 29 for returning the armature 26 to its original state when the excitation of the exciting coil 23 wound around the center of the core 21 is cut off is provided at one end 2 of the armature 26 itself.
It is attached to 6a. A rotation fulcrum for rotating the armature 26 with respect to the core 21 is provided near the one end 26a to which the permanent magnet 29 is attached.

Therefore, the distance from the rotation fulcrum of the armature 26 to the other end (free end) 26b can be set long. As a result, the contact springs 32a and 32b can be set to be long. That is, the ratio of the effective length L of the contact springs 32a, 32b to the length of the entire relay is calculated by using the contact springs 5a, 5b, 12a,
Compared to 12b, it can be set almost twice.

If the effective length L of each of the contact springs 32a and 32b can be increased, the contact spring 32 of each of the cards 28a and 28b can be increased.
a, 32b, the contact springs 32a. Since the contacts 32b operate substantially perpendicularly to the fixed contacts 37, the sliding phenomenon caused by the contacts after contact is reduced. Therefore, it becomes possible to extend the contact life.

Further, if the contact wear is small, at least a sufficiently accurate movement can be secured after the contacts come into contact with each other. Therefore, by setting the interval between the contacts in a non-contact state to be short, The magnetic gap G between the free end 26b of 26 and the other end 21b of the core can be set small. Therefore, by setting the magnetic gap G to be small, the armature 26 can be driven with a small magnetic force, so that the exciting coil 23
The number of turns of the relay can be reduced, and the entire relay can be made compact. If the magnetic guff G is small, the response characteristic of the relay operation can be improved.

Furthermore, since a permanent magnet having a special magnetized shape as shown in FIG. 5 is not used, it is possible to magnetize the relay after it is assembled into a relay. Therefore, the manufacturing cost does not significantly increase as compared with the conventional relay.

[0040]

As described above, according to the polarized relay of the present invention, the rotation center of the armature is moved to the vicinity of one end of the armature, and the permanent magnet is arranged in the moving direction. The magnetic force of the permanent magnet restores the armature to its original position after the excitation is cut off. Therefore, the distance from the pivot of the armature to the free end becomes long, and as a result, the ratio of the effective length of the contact spring to the armature length can be greatly increased. Therefore, the absolute length of the contact spring can be set long, the contact life can be greatly extended, and the responsiveness and reliability of operation can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an essential part of a polarized relay according to an embodiment of the present invention,

FIG. 2 is an exploded perspective view showing a schematic configuration of the relay of the embodiment.

FIG. 3 is an exploded perspective view showing a schematic configuration of the relay of the same embodiment,

FIG. 4 is a schematic sectional view showing a schematic configuration of a conventional polarized relay,

FIG. 5 is a schematic sectional view showing a schematic configuration of another conventional polarized relay,

FIG. 6 is a view showing a contact spring for explaining problems of each conventional polarized relay.

[Explanation of symbols]

21 ... Core, 22 ... Coil bobbin, 22a ... Rotating shaft, 2
3 ... Excitation coil, 25a, 25b ... Coil terminal, 26 ...
Armature, 27 ... Bearing part, 28a, 28b ... Card, 29 ... Permanent magnet, 30 ... Yoke, 31 ... Contact support block, 32a, 32b ... Contact spring, 33 ... Base, 3
6, 37 ... Fixed contact.

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[Procedure amendment]

[Submission date] June 23, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (1)

Claims: 1. A long core (21), an armature (26) provided substantially parallel to the core, and a rotation fulcrum set near one end of the armature. A rotating shaft (22) that rotatably supports the armature with respect to the core.
a) and a permanent magnet (29) attached to the one end side from the rotation fulcrum of the armature and rotating the armature so that the one end is biased to the one end of the core.
And is wound around the center of the core, and rotates in response to energization such that the other end of the armature is attracted to the other end of the core against the biasing force of the permanent magnet. Excitation coil (23), one side fixed contact springs (32a, 32b) arranged substantially parallel to the core, and is attached near the other end of the armature, in response to the rotating motion of the armature, A polarized relay including a card (28a, 28b) for urging the contact spring near the free end.