JPH0516128B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The present invention relates to a polarized relay.

[Background Art] Generally, in this type of polarized relay, the armature block is supported by a shaft, and the attraction force of the armature by the coil block is adjusted by a separately provided spring. In other words, the spring force of the movable contact spring piece is used to adjust the suction force.
In this case, since the contact pressure of the contact changes when the suction force is adjusted, it is difficult to independently set the suction force and the contact pressure to optimal values.

[Object of the Invention] The present invention has been made in view of the above points, and its main purpose is to make it possible to adjust the attraction force of the armature without affecting the contact pressure. Our purpose is to provide polarized relays.

[Disclosure of the Invention] (Examples) Examples of the present invention will be described below based on the drawings. As shown in FIG. 1, the casing 1 is composed of a box-shaped base 11 and a box-shaped cover 12 fitted over the base 11. As shown in FIG.

The base 11 is a molded product made of an insulating material such as synthetic resin, and a recess 13 is formed in the center of each side wall in the longitudinal direction. Each recess 1
3 are each provided with a contact piece 21, and the contact piece 2
1 is made of a conductive material and is integrally formed with a common terminal piece 22 which is exposed on the outside of the side wall in the width direction of the base 11 and projects downward. Ribs 14 are formed at each of the four inner corners of the base 11. A fixed contact plate 24 having a fixed contact 23 is provided on the rib 14, and the fixed contact plate 24 is made of a conductive material integrally with a fixed terminal piece 25 that is exposed on the outside and protrudes downward from the side wall in the width direction of the base 11. It is formed. Notches 15 are formed in both longitudinal walls of the base 11, and a pair of coil terminal coupling pieces 26 protrudes from the bottom surface of each notch 15, respectively. The coil terminal coupling piece 26 is integrally formed of a conductive material with a coil terminal piece 27 that is exposed on the outside of both widthwise walls of the base 11 and projects downward. In this way, contact piece 2
1 and the common terminal piece 22, the fixed contact plate 24 and the fixed terminal piece 25, and the coil terminal coupling piece 26 and the coil terminal piece 27 are each integrally formed of a conductive material,
The base 11 and each conductive material are integrated by insert molding. The conductive material is routed within the side wall of the base 11 so that the conductive material is contained within the side wall of the base 11 over substantially the entire length thereof. Therefore, the side walls of the base 11 are reinforced with a conductive material, and together with the box shape of the base 11, the strength is increased.

The cover 12 is a molded product made of an insulating material such as synthetic resin, and has four partition pieces 16 protruding from the inner bottom surface. The partition piece 16 is formed along the longitudinal direction of the cover 12.

A coil block 3, a permanent magnet 4, and an armature block 5 are disposed within a casing 1 formed by a base 11 and a cover 12.

As shown in FIG. 3, the coil block 3 has a coil 32 mounted on an iron core 31 which is substantially U-shaped and is open upward.
is wrapped, and both magnetic poles of the iron core 31 are each covered with a tsuba 33 made of an insulating material.
The tips of both magnetic poles are exposed from the circumferential surface of 3. A pair of coil terminals 34 connected to the coil 32 are provided corresponding to each collar 33, and are bent so as to protrude above the collar 33 and come into contact with the coil terminal coupling piece 26. With the coil block 3 housed in the base 11, the coil terminal 34 and the coil terminal coupling piece 2
6 and is electrically and mechanically coupled by welding, soldering, or the like. Here, the coil terminal 34 and the coil terminal coupling piece 26 each protrude above both magnetic poles of the iron core 31,
Further, since the coil terminal coupling piece 26 is provided protrudingly within the notch 15, the coil terminal coupling piece 26 and the coil terminal 34 are exposed from the base 11, and operations such as welding or soldering of the two are not possible. This makes it easier. The permanent magnet 4 is interposed between both magnetic poles of the iron core 31 so that the magnetic poles are in contact with each other.

The permanent magnet 4 is plate-shaped, and a groove 41 with a substantially semicircular cross section running in the width direction of the base 11 is formed in the center of the surface. The surface of the permanent magnet 4 is the base 11
It forms an inclined surface 42 which is thick at the intermediate portion in the longitudinal direction and gradually becomes thinner toward the end. Further, both ends of the permanent magnet 4 in the longitudinal direction of the base 11 are magnetized with the same polarity, and the middle part is magnetized with different magnetic poles. That is, if both ends are north poles, the middle part is magnetized to be south pole. However, the magnetized position of the intermediate portion may be shifted toward one end, and in that case, monostable operation can be achieved. The magnetic poles at both ends of the permanent magnet 4 are interposed between the two legs so as to abut against the inner surface of each magnetic pole of the iron core 31 of the coil block 3. Here, a required gap may be interposed between the magnetic pole of the iron core 31 and the magnetic poles at both ends of the permanent magnet 4, and a difference may be provided between the two gaps in order to obtain the required magnetic characteristics.

The armature block 5 includes a flat plate-shaped armature 51 made of a magnetic material, movable contact spring pieces 52 disposed on both sides of the armature 51, and integrally molded together with the armature 51 and the movable contact spring pieces 52. The spring support body 53 is a molded article of an insulating material such as a synthetic resin. Here, the armature 51
The movable contact spring piece 52 is molded integrally with the spring support 53, and by arranging the movable contact spring piece 52 along the side edge of the armature 51, movable contact with the armature 51 is achieved. Compared to the case where the spring pieces 52 are arranged in the thickness direction of the armature 51, it becomes easier to integrally mold the spring support body 53.
That is, by adopting this configuration, the armature 51 and the movable contact spring piece 52 can be arranged side by side in the mold for molding, and can be easily held in the mold and removed from the mold. This makes demolding easier.
As shown in FIG. 4, on the back surface of the armature 51, a protrusion 54 having a substantially semicircular cross section and running in the width direction of the armature 51 is formed. The movable contact spring piece 52 is an electrically conductive leaf spring, and has a support piece 55 in the center in the longitudinal direction that has a substantially T-shaped tip facing in the width direction.
are integrally protruded. In addition, slits 56 are formed at both ends in the longitudinal direction, each opening at the tip, so that the tip of the movable contact spring piece 52 can be easily bent. A notch 57 is formed in the spring support 53 and opens at both ends of the armature 51 in the width direction. A support piece 55 is provided to protrude from the inner end of the notch 57, and the tip of the support piece 55 protrudes outward from the spring support 53 in the width direction of the armature 51. That is, since the movable contact spring piece 52 is fixed by the spring support 53 at the center in the longitudinal direction, and the support piece 55 is provided protruding from the spring support 53, the movable contact spring piece 52
Spring force is applied independently to both ends of the longitudinal direction and the support piece 55. This armature block 5 accommodates the protrusion 54 provided on the back surface of the armature 51 in the groove 41 of the permanent magnet 4, and
A recess 13 in which a support piece 55 is provided in the side wall of the base 11
The armature block 5 is arranged at a fixed position within the base 11 by fitting into the armature block 5, and the armature block 5 can swing freely around the support piece 55.
In this way, the support piece 55 is fitted into the recess 13 formed in the peripheral wall of the base 11 to support the armature block 5.
The distance between the ends of the armature block 5 can be maximized, and the armature block 5 can be made large within a limited space. Furthermore, since the support piece 55 integrally formed with the movable contact spring piece 52 supports the armature block 5, the movable contact spring piece 52 serves both as a conductive part and a support part, and the component parts This will lead to a reduction in Further, since the configuration in which the flat support piece 55 is the center of swing of the armature block 5 allows the armature block 5 to swing freely by utilizing the twisting of the support piece 55, the armature block 5 and other There is no or almost no part that causes friction between the armature block 5 and the armature block 5, and the starting force required to overcome the static frictional force at the time of initial movement of the armature block 5 is reduced, making it possible to obtain a highly sensitive polarized electromagnet. It can be done. In addition to the fact that the armature block 5 pivots around both support pieces 55 attached to the base 11, the middle part of the armature 51 is fitted into the middle part of the permanent magnet 4 to guide the swing. As a result, the center of oscillation does not shift due to external vibrations or shocks, resulting in stable operation. On the other hand, since the spring force due to the twisting of the support piece 55 acts on the armature block 5,
As shown in FIG. 5, the attractive force acting on the armature 51 can be adjusted by the spring force caused by the twisting of the armature 51, and the spring force of the movable contact spring piece 52 allows the fixed contact 23 and the movable contact spring piece 52 to be adjusted. The contact pressure between the two can be adjusted. As a result, the contact pressure can be adjusted by adjusting the shape and dimensions of both ends of the movable contact spring piece 52 in the longitudinal direction, and the support piece 5
Since the suction force can be adjusted by adjusting the shape and dimensions of 5, the contact pressure and the suction force can be adjusted separately and independently. moreover,
Since the movable contact spring piece 52 applies independent spring force to each longitudinal end,
By adjusting the shape and dimensions of both ends of the movable contact spring piece 52, it is possible to independently adjust the contact pressure for both fixed contacts 23, making it easy to adjust the contact pressure. Further, the movable contact spring pieces 52 are connected to the armature 51 on both sides of the armature 51 in the width direction.
Since it is disposed on substantially the same plane as the above, the overall thickness in the vertical direction can be reduced. Although the movable contact spring pieces 52 are provided on both sides of the armature 51, they may be provided on only one of them.

As described above, the cover 12 is fitted onto the base 11 with the coil block 3, permanent magnet 4, and armature block 5 housed within the base 11. As shown in FIG. 2, the four partition pieces 16 protruding from the inner bottom surface of the cover 12 are connected to the armature 51 when the cover 12 is fitted onto the base 11.
and the movable contact spring piece 52,
An insulating partition piece 16 is interposed between the armature 51 and the movable contact spring piece 52, so that a large insulation distance can be maintained between the two.

In the above example, the groove 41 of the permanent magnet 4 has a substantially semicircular cross section, but the cross section may be substantially V-shaped and open upward. In this case, the protrusion 54 formed on the armature 51 may have a thin blade shape. Further, in addition to the above-mentioned shape, any shape may be used as long as the permanent magnet 4 and the armature 51 are fitted into each other so that the armature 51 is guided in a swinging manner. Furthermore, the permanent magnet 4 and the armature 51 may be fitted together in constant contact with each other, or may be fitted only when external vibrations or shocks are applied.

With the above configuration, if the coil 32 is energized,
Depending on the direction of magnetization, one end of the armature 51 in the longitudinal direction is attracted to one of the magnetic poles of the iron core 31, and the armature block 5 swings, causing the rotation of the iron core 31 → armature 51 → permanent magnet 4 → iron core. 31 closed magnetic circuits are formed, and one longitudinal end of the movable contact spring piece 52 contacts the corresponding fixed contact 23. When the coil 32 is de-energized in this state, the magnetic force of the permanent magnet 4 maintains the closed magnetic path as it is, and the armature 5
1 is maintained in contact with one side of the iron core 31. Furthermore, if the current direction to the coil 32 is reversed, the armature 51 is attracted to the other magnetic pole of the iron core 31, and the other longitudinal end of the movable contact spring piece 52 is connected to the corresponding fixed contact 23. Contact. Even in this state, the state is maintained after the current supply is stopped, and so-called bistable operation can be performed.

[Effects of the Invention] As described above, in the present invention, since the elastic support pieces protruding from both sides of the intermediate portion of the armature are locked in the recesses formed in the peripheral wall of the base, the armature The attraction force can be adjusted by the spring force caused by the twisting of the support piece, and it is only necessary to adjust the shape and dimensions of the support piece. For example, when the polar electromagnet of the present invention is used in a relay. This has the advantage that it can be adjusted independently of the movable contact spring piece and that the attraction force of the armature can be adjusted without affecting the contact pressure. That is, a movable contact spring piece disposed along the side edge of the armature is coupled to the middle part of the armature, and a fixed contact is fixed to the base opposite the tip of the movable contact spring piece. In the swing range of the pole, when the movable contact spring piece is not in contact with the fixed contact, the spring force of the support piece acts on the armature, and when the movable contact spring piece is in contact with the fixed contact, the support piece acts on the armature. In addition to the spring force of the movable contact spring piece, the spring force of the movable contact spring piece acts. As a result, the contact pressure between the movable contact spring piece and the fixed contact is determined by the spring constant of the movable contact spring piece and the amount of movement of the armature after the movable contact spring contacts the fixed contact. It's hot,
Even if the amount of current applied to the coil block or the magnetic force of the permanent magnet varies, the spring load applied by the support piece does not change, so a constant contact pressure can be obtained, and even if the fixed contact wears out, the stroke of the armature will not change. In other words, the contact pressure and the attraction force of the armature can be set independently.
Furthermore, by locking the support pieces protruding from both sides of the middle part of the armature into the recesses formed in the base, the armature can be swung without rotating the support pieces relative to the base. This has the advantage that there is little possibility that unfavorable changes will occur in the operating characteristics even after long-term use. In addition, since the support piece that becomes the swing axis of the armature is locked in the recess formed in the peripheral wall of the base, the distance between the tips of the support pieces can be maximized within the base. Although the space is limited, driving efficiency can be increased by making the armature relatively large. Furthermore, a movable contact spring piece arranged along the side edge of the armature is integrally connected to the middle part of the armature via a spring support made of an insulating material, so that the armature and movable Integration with the contact spring piece reduces the number of parts during assembly, making assembly easier.
By arranging the movable contact spring piece along the side edge of the armature and integrally coupling the armature and the movable contact spring piece with a spring support, the armature and the movable contact spring piece are connected to each other on the armature. Compared to the case where the spring supports are arranged in the thickness direction, there is an effect that integral molding of the spring support body becomes easier. In other words, by adopting the above configuration, the armature and the movable contact spring piece can be arranged side by side in the mold for molding, and can be easily held in the mold or removed from the mold. This has the effect of making it easier.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Figure 2 is a partially omitted plan view of the same as above with the cover removed, Figure 3 is a sectional view of the same as above, Figure 4 is a perspective view of the bottom side showing the armature block used in the same as above, and Figure 5 is It is an explanatory diagram of operation same as the above. 3 is a coil block, 4 is a permanent magnet, 5 is an armature block, 11 is a base, 13 is a recess, 23 is a fixed contact, 31 is an iron core, 32 is a coil, 51 is an armature, 52 is a movable contact spring piece , 53 is a spring support body, and 55 is a support piece.

Claims (1)

[Claims] 1 A coil block in which a coil is wound around an iron core is installed between both magnetic poles of the iron core, and both ends corresponding to the magnetic poles are magnetized with the same polarity, and the middle part between the two magnetic poles is magnetized with a different polarity from both ends. A magnetized permanent magnet, an armature whose both ends face the magnetic poles of the iron core, and whose middle part faces the middle part of the permanent magnet, and which protrude from both sides of the middle part of the armature. The armature block includes an elastic support piece, and a base has a recess formed in the peripheral wall to lock the support piece so that the armature can swing freely. Movable contact spring pieces arranged along the side edges of the armature are connected together via a spring support made of an insulating material, and a fixed contact is placed on the base opposite the tip of the movable contact spring piece. A polarized relay characterized by being fixed to.