JPH05174691A - Seesaw balance type polarized relay - Google Patents

Abstract

PURPOSE:To simplify a structure, and also reduce electric power consumption by shifting a load of an armature composed of a movable contact point spring and a suction force generated by a permanent magnet in the direction for being strengthened on the normal open side, and sucking the edge part of the armature by means of an open side magnetic pole part even if a magnetic flux generated by a coil is small. CONSTITUTION:Though a movable contact point spring 1 and an armature 2 are formed integrally in the central part through an insulating body 6 so as to become parallel with each other, a support part 11 is twisted to the spring 1, so that a plane containing the support part 11 and a plane containing the spring 1 can cross each other when seen from the side surface. When seen from the side surface in an electric current unimpressed condition after the spring 1 is installed in a box body in this way, the support part 11 is supported with the box body, so that a plane containing the edge surfaces of magnetic pole parts 31 and 32 and a plane opposed to the magnetic pole parts 31 and 32 of the armature 2 can be expanded in one direction. Thereby, a suction force of the magnetic pole parts 31 and 32 generated by a permanent magnet 7 becomes asymmetrical between left and right as shown by a broken line, so that the suction force generated by the open side magnetic pole part 32 can be shifted in the direction for becoming larger than the suction force generated by the closed side magnetic pole part 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-compact seesaw-balanced polarized relay which is mounted in a switch or the like with high density.

An electromagnetic relay corresponding to each subscriber circuit is mounted on a printed circuit board of an exchange. In recent years, the number of circuits per printed circuit board has increased as the number of subscriber circuits has increased.
There is a demand for miniaturization of the electromagnetic relay, for example, reduction in height and area saving. A seesaw-balanced polarized relay (hereinafter abbreviated as a polarized relay) is suitable for such applications because it can reduce the height and area. However, it is extremely difficult to match the attraction force characteristic and the panel load characteristic in the conventional polarized relay. Therefore, it is desired to realize a polarized relay that has a simple component shape and can easily match the attraction force characteristic and the panel load characteristic.

[0003]

2. Description of the Related Art FIG. 2 shows a conventional latch type polarized relay, FIG. 3 shows a conventional general-purpose polarized relay, and FIG.
FIG. 4 is a diagram showing an example of a conventional general-purpose polarized relay.

In FIG. 2 (a), a conventional latch type polarized relay has a movable contact spring 1 in which a central supporting portion 11 is supported by a box body, and a central portion is fixed to the movable contact spring 1 via an insulator 6. Seesaw-shaped armature 2 and magnetic poles 3 at both ends
A U-shaped iron core 3 in which 1 and 32 are opposed to the armature 2 and a permanent magnet 4 mounted on the center of the iron core 3 to support the armature 2.
And the coil 5 wound around the long shaft portion 33 of the iron core 3,
Movable contacts 12a, 12b provided at both ends of the movable contact spring 1
Face fixed contacts 13a and 13b, respectively.

The load characteristics of the armature in the latch type polarized relay are symmetrical as shown by the solid line in FIG. 2 (b), and the force of twisting the bearing during operation gradually increases until the movable contact contacts the fixed contact. However, the force for pressing the movable contact against the fixed contact rapidly increases after the movable contact contacts the fixed contact. On the other hand, the attraction force by the permanent magnet is also symmetrical as shown by the broken line in the figure, and both magnetic pole portions have the attraction force capable of maintaining the attracted state of the armature.

For example, if a current is applied to the coil 5 and the attractive force of the magnetic pole portion 31 is increased as shown by the alternate long and short dash line in FIG. 2 (b),
The armature 2 is attracted to the magnetic pole portion 31 and the movable contact 12a and the fixed contact 13a are closed to maintain that state even after the current is cut off. On the contrary, when currents having different polarities are applied to the coil 5 to increase the attraction force of the magnetic pole portion 32, the armature 2 is attracted to the magnetic pole portion 32, the movable contact 12b and the fixed contact 13b are closed, and even after the current is cut off. Stay in the state.

However, although the latch type polarized relay has a simple structure, it is necessary to change the direction of current when the contacts are opened and closed, which complicates the drive circuit. Therefore, in the case of a general-purpose polarized relay that is used for the same purpose as a general electromagnetic relay, the NC (normal close) side contact is closed when no current is applied to the coil, and NO (normal close) is applied when a predetermined current is applied. ope
n) The side contacts are configured to close.

As shown in FIG. 3 (a), the conventional general-purpose polarized relay has a movable contact spring 1 in which a central supporting portion 11 is supported by a box body, and a central portion is connected to the movable contact spring 1 via an insulator 6. A fixed seesaw-shaped armature 2 and a coil 5 on the long shaft 33.
A U-shaped iron core 3 in which the magnetic poles 31 and 32 at both ends are opposed to the armature 2 and a flat plate shape mounted between the magnetic poles 31 and 32 to support the central portion of the armature 2. The movable contacts 12a and 12b provided at both ends of the movable contact spring 1 have the permanent magnets 4 and face the fixed contacts 13a and 13b, respectively.

The movable contact spring 1 and the armature 2 are integrated so as to be parallel to each other in the center through an insulator 6, but the surface including the bearing 11 and the surface including the movable contact spring 1 are seen from the side. The support portion 11 is twisted with respect to the movable contact spring 1 so as to intersect with the movable contact spring 1, and when the movable contact spring 1 is mounted on the box and viewed from the side without applying current to the coil 5, the magnetic pole portion The support portion 11 is supported by the box body such that the plane including the end faces of 31, 32 and the surface of the armature 2 facing the magnetic pole portions 31, 32 expand toward one side.

The permanent magnet 4 is magnetized so that the portion in contact with the magnetic poles 31 and 32 becomes the S pole when the vicinity of the portion in contact with the central armature 2 is, for example, the N pole. The attraction forces of 31 and 32 are symmetrical as shown by the broken line in FIG. 3 (b). However, by supporting the support portion 11 on the box body as described above, the load of the armature shifts as left and right symmetrical as shown by the solid line in the figure, and the attraction force of the NC side magnetic pole is larger than the load and the NO side magnetic pole is attracted. Force can be less than load.

That is, before the current is applied to the coil 5, the NC side end of the armature 2 is attracted to the magnetic pole 31 and the movable contact 12a and the fixed contact 13 provided at the tip of the movable contact spring 1 are fixed.
The space between a is closed. When a current is applied to the coil 5 to increase the attractive force of the magnetic pole portion 32 on the NO side as shown by the alternate long and short dash line,
The end of the armature 2 is attracted to the magnetic pole 32 to close the gap between the movable contact 12b and the fixed contact 13b, but when the current applied to the coil 5 is cut off, the armature 2 is attracted to the magnetic pole 31 and the NC side again. The movable contact 12a and the fixed contact 13a are closed.

An example of a conventional general-purpose polarized relay is shown in FIG.
As shown in (a), it has an armature 2 and a pair of movable contact springs 1 arranged on both sides thereof, and the armature 2 and the movable contact spring 1 arranged in parallel are integrated by an insulator 6 molded in the center. Has been done. The movable contact spring 1 is provided with a T-shaped support portion 11 projecting laterally from the center. By welding the support portion 11 to a common terminal 14 whose tip is divided into two, the movable contact spring 1 and the armature are joined. 2 is supported in place.

As shown in FIG. 4 (b), the movable contacts 12a and 12b are fixed to the ends of the movable contact spring 1, and the fixed contacts 13a and 13b facing the movable contacts 12a and 12b are fixed contact terminals 15a, respectively. And fixed to the tip of 15b.
The common terminal 14 and the fixed contact terminals 15a and 15b are fitted and inserted in the terminal mold 16, and by mounting the terminal mold 16 on the bottom plate 17, the common terminal 14 and the fixed contact terminals 15a and 15b.
b is fixed.

As shown in FIG. 4 (c), the coil 5 is wound around a coil bobbin 51 fitted in the long shaft portion 33 of the iron core 3,
Both ends of the coil 5 are connected to the coil terminals 52 embedded in the coil bobbin 51, respectively. Also, the magnetic pole part 3 of the iron core 3
A flat plate-shaped permanent magnet 4 is mounted between 1 and 32,
When the center of the permanent magnet 4 is, for example, the N pole, the portion contacting the magnetic poles 31 and 32 is magnetized so that the S pole is formed, and the projection 21 provided at the center of the armature 2 is brought into contact with the center of the permanent magnet 4. It is configured to touch.

[0015]

As shown in FIG. 3 (b), the conventional general-purpose polarized relay in which the attraction force by the permanent magnet is symmetrical and the load of the armature is shifted is such that the end of the armature is located on the NC side. The magnetic flux generated by the coil must be made extremely large in order to cancel the attractive force of the permanent magnets attracted to the magnetic poles and cause the end portions of the armature to be attracted to the magnetic poles on the NO side.

However, in order to increase the magnetic flux generated by the coil, it is necessary to increase the ampere-turn of the coil. If the number of turns of the coil is increased and the ampere-turn is increased, the polar relay is upsized. In addition, there is a problem that increasing the current flowing through the coil and increasing the ampere-turn causes an increase in power consumption.

An object of the present invention is to provide a general-purpose polarized relay which is small in size, has low power consumption, has a simple structure, and is inexpensive.

[0018]

FIG. 1 is a diagram showing a general-purpose polarized relay according to the present invention. Note that the same object is denoted by the same symbol throughout the drawings.

The above problems are solved by a movable contact spring 1 having movable contacts 12a and 12b at both ends and a supporting portion 11 at the center, and a seesaw-shaped armature 2 having the center fixed to the movable contact spring 1 and having the same shape. The U-shaped iron core 3 with the magnetic poles 31 and 32 at both ends facing the armature 2, the permanent magnet 7 mounted between the magnetic poles 31 and 32 and in contact with the center of the armature 2, and the long axis of the iron core 3. The coil 5 is wound around 33, and the plane including the end faces of the magnetic pole portions 31 and 32 and the magnetic pole portions 31 and 32 of the armature 2 when viewed from the side without applying a current to the coil 5. A polarized relay in which the support portion 11 of the movable contact spring 1 is supported by the box so that the distance between the opposing surfaces widens in one direction, and the cross-sectional areas of the permanent magnets 7 in the vicinity of both end surfaces are the same. Achieved by different polarized relays of the present invention.

[0020]

In FIG. 1, when viewed from the side without applying a current to the coil, the plane including the end face of the magnetic pole portion and the surface of the armature facing the magnetic pole portion are movable so that the distance between them widens toward one side. The pole relay of the present invention, in which the bearing portion of the contact spring is supported by the box and the permanent magnets having different cross-sectional areas in the vicinity of both end faces are mounted between the magnetic pole portions, is used for the armature of a movable contact spring or the like. The attraction force of the load and the permanent magnet shifts to a stronger direction on the NO side, and the end portion of the armature can be attracted to the NO side magnetic pole portion even if the magnetic flux generated by the coil is small. That is, it is possible to realize a general-purpose polarized relay which is small in size, has low power consumption, has a simple structure, and is inexpensive.

[0021]

Embodiments of the present invention will be described in detail below with reference to FIG. As shown in FIG. 1 (a), the general-purpose polarized relay according to the present invention has a movable contact spring 1 in which a central supporting portion 11 is supported by a box body, and a central portion fixed to the movable contact spring 1 via an insulator 6. Seesaw-shaped armature 2 and coil 5 on the long shaft 33
A U-shaped iron core 3 in which the magnetic poles 31 and 32 at both ends are opposed to the armature 2 and a flat plate shape mounted between the magnetic poles 31 and 32 to support the central portion of the armature 2. The movable contacts 12a, 12b provided at both ends of the movable contact spring 1 have the permanent magnets 7, and face the fixed contacts 13a, 13b, respectively.

The movable contact spring 1 and the armature 2 are integrated so as to be parallel to each other via an insulator 6 in the center, but the surface including the bearing 11 and the surface including the movable contact spring 1 are viewed from the side. The support portion 11 is twisted with respect to the movable contact spring 1 so as to intersect with the movable contact spring 1, and when the movable contact spring 1 is mounted on the box and viewed from the side without applying current to the coil 5, the magnetic pole portion The support portion 11 is supported by the box body such that the plane including the end faces of 31, 32 and the surface of the armature 2 facing the magnetic pole portions 31, 32 expand toward one side. As a result, the load on the armature, such as the movable contact spring, shifts while remaining symmetrical as shown by the solid line in FIG. 1 (b).

Further, the permanent magnet 7 is removed stepwise so that the cross-sectional area of one end face becomes smaller than the cross-sectional area of the other end, and if the vicinity of the face contacting the armature 2 is, for example, the N pole, the magnetic pole is formed. The non-magnetic material such as resin is magnetized so that the end surfaces contacting the portions 31 and 32 are magnetized so as to become the S pole, and removed stepwise.
It is attached and flattened to facilitate assembly.

As a result, the magnetic pole portions 31 and 32 of the permanent magnet 7 are formed.
1B becomes asymmetrical as shown by the broken line in FIG. 1B, and the attraction force by the NO-side magnetic pole portion 32 is shifted to be larger than the attraction force by the NC-side magnetic pole portion 31.
Although the end face of the permanent magnet 7 is removed in the thickness direction in this embodiment, the end face of the permanent magnet 7 may be removed in the width direction.

However, even if the attraction force of the magnetic pole portion 31 due to the permanent magnet 7 is shifted to a smaller direction, it is larger than the load of the armature, and before the current is applied to the coil 5, NC of the armature 2 is applied.
The movable contact 12a whose side end is attracted to the magnetic pole 31 and which is provided at the tip of the movable contact spring 1 integrated with the armature 2
And the fixed contact 13a are closed.

When a current is applied to the coil 5 to increase the attractive force of the magnetic pole portion 32 as indicated by the alternate long and short dash line in FIG. 1 (b),
The NO-side end of the armature 2 is attracted to the magnetic pole 32 and moves.
Although the space between the fixed contact 13b and the fixed contact 12b is closed, the load of the armature 2 is smaller than the load of the armature even if the permanent magnet 7 is shifted in the direction in which the attraction force of the magnetic pole part 32 is increased. It is sucked into 31 and the movable contact 12a on the NC side and the fixed contact 13a are closed again.

Thus, when viewed from the side without applying a current to the coil, it is movable so that the distance between the plane including the end face of the magnetic pole portion and the surface facing the magnetic pole portion of the armature widens toward one side. The contact spring is supported by the box, and
A polar relay of the present invention in which permanent magnets having different cross-sectional areas near both end surfaces are mounted between magnetic pole portions is a direction in which the load of an armature such as a movable contact spring and the attraction force by the permanent magnet become stronger on the NO side. Even if the magnetic flux generated by the coil is small, the end of the armature can be attracted to the NO-side magnetic pole. That is, it is possible to realize a general-purpose polarized relay which is small in size, has low power consumption, has a simple structure, and is inexpensive.

[0028]

As described above, according to the present invention, it is possible to provide a general-purpose polarized relay which is small in size, consumes less power, has a simple structure, and is inexpensive.

[Brief description of drawings]

FIG. 1 is a diagram showing a general-purpose polarized relay according to the present invention.

FIG. 2 is a diagram showing a conventional latch-type polarized relay.

FIG. 3 is a diagram showing a conventional general-purpose polarized relay.

FIG. 4 is a diagram showing an example of a conventional general-purpose polarized relay.

[Explanation of symbols]

1 Moving contact spring 2 Armature 3 Iron core 5 Coil 6 Insulator 7 Permanent magnet 11 Bearing parts 12a, 12b Moving contacts 13a, 13b Fixed contact 31, 32 Magnetic pole part 33 Long axis part 71 Non-magnetic substance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takanori Tanaka 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (3)

[Claims] 1. A movable contact spring (1) having movable contacts (12a, 12b) at both ends and a bearing (11) in the center, and a seesaw shape in which the center is fixed to the movable contact spring (1). Armature of (2),
The magnetic poles (31, 32) at both ends having the same shape are mounted between the U-shaped iron core (3) and the magnetic poles (31, 32) facing the armature (2), and the armature (2) Has a permanent magnet (7) in contact with the center of the core and a coil (5) wound around the long shaft part (33) of the iron core (3), with no current being applied to the coil (5). When viewed from the side, the plane including the end faces of the magnetic pole portions (31, 32) and the armature (2)
Of the movable contact spring (1) so that the distance from the surface of the movable contact spring facing the magnetic poles (32, 33) widens toward one side.
A seesaw-balanced polar relay in which the cross-sections of the permanent magnets (7) in the vicinity of both end surfaces are different from each other. 2. A flat permanent magnet is removed stepwise in the vicinity of one end surface thereof in the width direction or the thickness direction.
A seesaw-balanced polarized relay characterized in that the permanent magnet (7) described above is formed. 3. The permanent magnet (7) according to claim 1, wherein one end surface of the flat permanent magnet is removed stepwise, and a nonmagnetic substance (71) is adhered to the removed portion to form the permanent magnet (7). A seesaw-balanced polarized relay that is characterized by: