JP2020123587A - Electromagnetic relay - Google Patents

Abstract

To enhance a breaking capacity without increasing a size.SOLUTION: An electromagnetic relay comprises: an excitation coil 21; a terminal; a fixed contact point 31 provided to the terminal; a movable contact point 391; a stopper 5; an armature 25; and a case. The movable contact point 391 is provided to a movable spring 35 or is structured by a part opposite to the fixed contact point 31 of the movable spring 35. The movable spring 35 moves as a support point of the fixed part 37 on the basis of ON/OFF of a conduction to the excitation coil 21, and makes the movable contact point 391 moving to a direction a contact and a separation to/from the fixed contact point 31. The stopper 5 suppresses the movement of the movable spring 35. The armature 25 is attached to the movable spring 35, and is integrally deformed with the movable spring 35. The case houses the fixed contact point 31, the movable spring 35, the stopper 5, and the armature 25. The stopper 5 contacts to the armature 25 when the conduction to the excitation coil 21 is tuned off.SELECTED DRAWING: Figure 1

Description

The present invention relates generally to electromagnetic relays, and more particularly to hinged electromagnetic relays.

BACKGROUND ART Conventionally, an electromagnetic relay including a permanent magnet for extinguishing an arc generated when a movable contact separates from a fixed contact is known (for example, refer to Patent Document 1).

The electromagnetic relay described in Patent Document 1 includes a permanent magnet arranged near a contact portion (fixed contact, movable contact). In this electromagnetic relay, the arc generated between the movable contact and the fixed contact is extended by the magnetic force of the permanent magnet and then extinguished.

JP, 10-326553, A

However, in the conventional electromagnetic relay described in Patent Document 1, since the permanent magnet is arranged in the vicinity of the contact, it is necessary to use a small permanent magnet as the permanent magnet for extinguishing the arc. Therefore, there is a problem that the magnetic flux density in the vicinity of the contact is small and the breaking ability cannot be sufficiently enhanced.

When a large permanent magnet is used to solve the above problem, there is a problem that the entire electromagnetic relay also becomes large.

The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic relay capable of increasing the breaking capability without increasing the size.

The electromagnetic relay of the present invention includes an exciting coil, a terminal, a fixed contact provided on the terminal, a movable contact provided on a movable spring, or a portion of the movable spring facing the fixed contact. The movable spring moves around the fixed portion as a fulcrum based on the turning on and off of the energization of the exciting coil, moves the movable contact in a direction of moving toward and away from the fixed contact, and suppresses the movement of the movable spring. An armature attached to the movable spring and displaced integrally with the movable spring; and a case accommodating the fixed contact, the movable spring, the stopper and the armature, wherein the stopper is the excitation magnet. When the coil is de-energized, it contacts the armature.

Moreover, the electromagnetic relay of the present invention includes an exciting coil, a fixed contact, a movable contact, a case, a terminal, a permanent magnet, and a yoke. The movable contact opposes the fixed contact along one direction, and comes into contact with and separates from the fixed contact according to energization of the exciting coil. The case houses the exciting coil, the fixed contact, and the movable contact. The terminal conducts to the fixed contact and the movable contact when the fixed contact and the movable contact come into contact with each other, and is drawn out from the case to the outside. The yoke is magnetically coupled to the permanent magnet. A magnetic flux is generated between the fixed contact and the movable contact by the permanent magnet and the yoke. The yoke has an insertion hole through which the terminal is inserted.

According to the present invention, the magnetic flux density in the vicinity of the contact (fixed contact, movable spring) and in the arc extinguishing space can be increased, so that the breaking capability can be improved without increasing the size of the magnet and the electromagnetic relay. ..

It is an appearance perspective view of the electromagnetic relay concerning an embodiment. It is an exploded perspective view of an electromagnetic relay concerning an embodiment. It is an appearance perspective view of a stopper concerning an embodiment. It is sectional drawing of the electromagnetic relay which concerns on embodiment. It is a perspective view of the important section of the electromagnetic relay concerning an embodiment. It is sectional drawing of the electromagnetic relay which concerns on embodiment. It is a perspective view of the important section of the electromagnetic relay concerning an embodiment. It is a disassembled perspective view which decomposed|disassembled a part of electromagnetic relay which concerns on embodiment. It is an external view of the yoke which concerns on embodiment. It is explanatory drawing for demonstrating the magnetic flux in the electromagnetic relay which concerns on embodiment. It is explanatory drawing for demonstrating the magnetic flux in the electromagnetic relay which concerns on embodiment. It is explanatory drawing for demonstrating operation|movement of the electromagnetic relay which concerns on embodiment. It is explanatory drawing for demonstrating operation|movement of the electromagnetic relay of a comparative example. It is an appearance perspective view of a stopper concerning a modification of an embodiment. It is an appearance perspective view of a stopper concerning other modifications of an embodiment. It is a perspective view of the principal part of the electromagnetic relay concerning the further another modification of an embodiment.

An electromagnetic relay according to the following embodiments includes a magnet for extending an arc generated between a pair of fixed contacts and a movable spring, and a yoke that contacts the magnet. The magnet is adjacent to the pair of fixed contacts along a second direction orthogonal to the first direction in which the pair of fixed contacts are arranged, and is a third magnet orthogonal to the first direction and the second direction. It is provided adjacent to the exciting coil along the direction. The yoke is provided adjacent to the pair of fixed contacts in the third direction while being in contact with the magnet. As a result, in the electromagnetic relay, magnetic flux is generated near the contact. As a result, a force acts on the arc in the direction in which the pair of fixed contacts are lined up, and the arc can be extended in the direction.

Hereinafter, details of the electromagnetic relay according to the present embodiment will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the electromagnetic relay 1 according to the present embodiment includes an electromagnet block 2, a contact block 3, a case 4, a stopper 5, and an arc extinguishing mechanism 6.

As shown in FIG. 2, the electromagnet block 2 includes an exciting coil 21, a bobbin 22, an iron core 23, a yoke 24, an armature 25, and a pair of coil terminals 261 and 262.

The bobbin 22 includes a tubular portion 221 (see FIG. 4) and a pair of collar portions 222 and 223. The tubular portion 221 has an insertion hole 224 in the axial direction. That is, the tubular portion 221 is formed in a hollow cylindrical shape. The pair of collar portions 222 and 223 are formed, for example, in a substantially rectangular plate shape, and are formed at both ends of the tubular portion 221 in the axial direction. The tubular portion 221 and the pair of collar portions 222 and 223 are integrally formed of an insulating material such as resin. In the bobbin 22, the exciting coil 21 is wound around the tubular portion 221 between the collar portion 222 and the collar portion 223. A recessed portion 225 is formed substantially in the center of the tubular portion 221.

The iron core 23 is inserted into the insertion hole 224 of the bobbin 22 and faces the armature 25. The iron core 23 includes a shaft portion 231 and a collar portion 232. The shaft portion 231 is formed in a columnar shape, more specifically, a long columnar shape. The collar portion 232 is provided at one end of the shaft portion 231. The shaft portion 231 and the collar portion 232 are integrally formed of a magnetic material.

The yoke 24 includes a first piece 241 and a second piece 242, and is formed in a substantially L shape. The first piece 241 and the second piece 242 are integrally formed of a magnetic material. The first piece 241 is fitted into a recess 226 formed in the collar portion 223 of the bobbin 22. An insertion hole 243 is formed in the first piece 241. The iron core 23 is inserted into the insertion hole 243. The second piece 242 is provided so as to extend from one end of the first piece 241 in the vertical direction of the first piece 241. The second piece 242 is provided along the axial direction of the tubular portion 221 of the bobbin 22.

The armature 25 is attached to the movable portion 36 of the movable spring 35 and is displaced integrally with the movable portion 36. More specifically, the armature 25 is attached to the movable portion 36 and is arranged to face the iron core 23. The armature 25 is formed of a magnetic material in the form of a long flat plate. One end of the armature 25 is in contact with the second piece 242 of the yoke 24.

Each of the pair of coil terminals 261 and 262 is formed of a conductive material such as copper in a long plate shape. The tip of the exciting coil 21 is wound around each of the pair of coil terminals 261 and 262 and is connected by soldering or the like.

The contact block 3 includes a pair of fixed contacts 31 and 32, a pair of main terminals 33 and 34, and a movable spring 35.

The fixed contact 31 is attached to the main terminal 33, and the fixed contact 32 is attached to the main terminal 34. Each of the pair of main terminals 33 and 34 is made of a conductive material such as copper.

The movable spring 35 is configured to be capable of coming into contact with and separating from the pair of fixed contacts 31 and 32 according to whether the exciting coil 21 is energized or not. The movable spring 35 includes a movable portion 36, a fixed portion 37, and a return spring 38. The movable spring 35 is formed in a substantially L shape.

The movable portion 36 comes into contact with and separates from the pair of fixed contacts 31 and 32 according to the energization of the exciting coil 21. More specifically, the movable portion 36 is made of a conductive material such as copper. The movable portion 36 includes a base portion 361, a pressure contact portion 362, and a molding portion 363. In addition, the movable portion 36 includes a protruding portion 364. The part of the movable part 36 excluding the molding part 363 is made of metal. The molding portion 363 is made of an insulating material such as resin. The armature 25 is fixed to one surface of the movable portion 36.

The pressure contact portion 362 includes a pair of movable contacts 391 and 392, and is deformed when the exciting coil 21 is energized. The pair of fixed contacts 31, 32 are arranged side by side along the first direction D1. The movable contact 391 is provided at a position facing the fixed contact 31, and the movable contact 392 is provided at a position facing the fixed contact 32. The movable contact 391 contacts and separates from the fixed contact 31. The movable contact 392 contacts and separates from the fixed contact 32.

The protrusion 364 is provided between the pair of movable contacts 391 and 392. More specifically, the protruding portion 364 is provided so as to protrude from the molding portion 363 between the pair of movable contacts 391 and 392. When the exciting coil 21 is energized, the protrusion 364 contacts the stopper 5. The protrusion 364 preferably has elasticity. Therefore, it is preferable that the ratio of the width of the protrusion 364 to the length of the protrusion 364 is small.

The fixed portion 37 is fixed to the electromagnet block 2. More specifically, the fixing portion 37 is fixed to the second piece 242 of the yoke 24 by, for example, screwing. Thereby, the movable spring 35 is fixed to the yoke 24.

In the movable spring 35, when the exciting coil 21 is energized, the armature 25 is attracted to the iron core 23 by the magnetic force, whereby the movable portion 36 is deformed around the fixed portion 37 as a fulcrum, and the pair of fixed contacts 31. , 32. Then, in the movable spring 35, when the energization of the exciting coil 21 is cut off, the movable portion 36 is separated from the pair of fixed contacts 31 and 32 by the restoring force (elastic force).

The case 4 includes a base 41 having a substantially rectangular flat plate shape and a cover 42 having a substantially rectangular box shape. One side of the cover 42 is open and is covered by the base 41. The case 4 houses an exciting coil 21, a bobbin 22, an iron core 23, a yoke 24, an armature 25, a pair of fixed contacts 31 and 32, and a movable spring 35.

The base 41 has an insertion hole 411 through which the main terminal 33 is inserted, an insertion hole 412 through which the main terminal 34 is inserted, an insertion hole through which the coil terminal 261 is inserted, and an insertion hole through which the coil terminal 262 is inserted. Have Furthermore, the base 41 has a recess 43 that is open to the outside. More specifically, the base 41 has a recess 43 at a position adjacent to the exciting coil 21 in the third direction D3. A permanent magnet (magnet) 61 is housed in the recess 43. The base 41 also includes a wall portion 44 between the pair of fixed contacts 31 and 32. The wall portion 44 is provided so as to separate the fixed contact 31 and the fixed contact 32. The base 41 also includes a support portion 45 that supports the exciting coil 21.

The stopper 5 suppresses the movement of the movable portion 36 of the movable spring 35. More specifically, the stopper 5 is configured such that, when the excitation coil 21 is de-energized, the movable portion 36 (movable contacts 391, 392) of the movable spring 35 moves away from the fixed contact 31, 32. The movement of the movable portion 36 is suppressed. The stopper 5 is made of metal. Preferably, the stopper 5 is the same metal as the movable spring 35. However, the stoppers 5 are not limited to the same metal and may be different materials. The stopper 5 is preferably made of a non-magnetic material. However, the stopper 5 is not limited to the non-magnetic material and may be a magnetic material.

As shown in FIG. 3, the stopper 5 integrally includes a base portion 51, an extension portion 52, and a contact portion 53.

The base 51 is fixed to the electromagnet block 2. More specifically, the base 51 is fixed to the bobbin 22. The base portion 51 has a through hole 54 into which the shaft portion 231 of the iron core 23 is inserted. Then, the base portion 51 is fitted into a recess portion 225 formed substantially in the center of the collar portion 222 of the bobbin 22, and the collar portion 232 of the iron core 23 is inserted with the shaft portion 231 of the iron core 23 inserted into the through hole 54. It is sandwiched and fixed by the bobbin 22 and the bobbin 22. Further, the base 51 has four recesses 55 around the through hole 54. The base portion 51 also includes four contact pieces 56 provided in the four recesses 55. Each contact piece 56 is inclined so that the tip end is closer to the flange portion 232 side of the iron core 23 than the base end. Accordingly, when the base portion 51 is sandwiched between the collar portion 232 of the iron core 23 and the bobbin 22, the base portion 51 can be more firmly fixed.

The extension portion 52 is provided so as to extend from the base portion 51. More specifically, the extension portion 52 is provided so as to extend from the base portion 51 along a direction having an angle of 90° with the base portion 51.

The contact portion 53 has elasticity, and the movable portion 36 of the movable spring 35 and the armature 25 are in contact with each other. The contact portion 53 is provided at the tip of the extension portion 52. In the example of FIG. 3, the contact portion 53 is formed in a flat plate shape. The contact portion 53 projects from the tip of the extending portion 52 so as to form an angle of 90° with the extending portion 52. That is, the contact portion 53 is provided so as to be substantially parallel to the base portion 51.

When the exciting coil 21 is energized, the contact portion 53 contacts the movable portion 36. The contact portion 53 contacts the armature 25 when the excitation coil 21 is de-energized. When the movable portion 36 contacts the contact portion 53, the contact portion 53 elastically bends along the direction A1 in which the movable contacts 391 and 392 of the movable portion 36 separate from the fixed contacts 31 and 32. That is, the contact portion 53 has elasticity so that the movable contacts 391 and 392 bend along the direction A1 in which the movable contacts 391 and 392 move away from the fixed contacts 31 and 32. As a result, the contact portion 53 has a moving amount per unit time of the movable portion 36 of the movable spring 35 in the direction A1, that is, a moving speed of the movable portion 36, as compared with before the movable portion 36 contacts the contact portion 53. Reduce. The contact portion 53 is preferably in contact with the movable portion 36 of the movable spring 35 and the armature 25 at the tip end side rather than the base end side which is the extension portion 52 side.

When the excitation coil 21 is de-energized, the stopper 5 comes into contact with the armature 25 that is displaced integrally with the movable spring 35, as shown in FIGS. When the exciting coil 21 is energized, as shown in FIGS. 6 and 7, the stopper 5 operates before the pair of movable contacts 391 and 392 of the movable portion 36 of the movable spring 35 come into contact with the pair of fixed contacts 31 and 32. , Comes into contact with the protruding portion 364 of the movable portion 36. As a result, the stopper 5 reduces the moving speed of the movable portion 36 in the direction A2. The direction A2 is a direction in which the movable portion 36 (a pair of movable contacts 391, 392) approaches the pair of fixed contacts 31, 32. After that, when the energization of the exciting coil 21 is cut off, the stopper 5 contacts the armature 25 that is displaced integrally with the movable spring 35, as shown in FIGS. As a result, the stopper 5 relaxes the movement of the movable portion 36 in the direction A1. The direction A1 is a direction in which the movable portion 36 (the pair of movable contacts 391, 392) separates from the pair of fixed contacts 31, 32.

As shown in FIG. 8, the arc extinguishing mechanism 6 includes a permanent magnet 61 and a yoke 62.

When housed in the recess 43 of the base 41, the permanent magnet 61 is adjacent to the pair of fixed contacts 31 and 32 along the second direction D2 orthogonal to the first direction D1. At this time, the permanent magnet 61 is provided adjacent to the exciting coil 21 along the third direction D3 orthogonal to the first direction D1 and the second direction D2. The permanent magnet 61 is, for example, a ferrite magnet or the like. In the present embodiment, the permanent magnet 61 is arranged so that the yoke 62 side has an N pole and the exciting coil 21 side has an S pole.

The yoke 62 is made of a material having a high magnetic permeability such as an iron-based material (eg, galvanized steel plate). The yoke 62 is provided so as to contact the permanent magnet 61. More specifically, the yoke 62 is attached to the permanent magnet 61 by magnetic force. The yoke 62 is provided adjacent to the pair of fixed contacts 31 and 32 in the third direction D3 while being in contact with the permanent magnet 61. The yoke 62 is provided so as to contact the outer surface of the case 4 while being in contact with the permanent magnet 61. As shown in FIG. 9, the yoke 62 has an insertion hole 621 through which the main terminal 33 is inserted and an insertion hole 622 through which the main terminal 34 is inserted. Further, the yoke 62 is provided with a plurality of (four in the illustrated example) protrusions 623 for positioning the permanent magnet 61.

When the energization to the exciting coil 21 is cut off, when the movable contacts 391 and 392 separate from the fixed contacts 31 and 32, between the movable contact 391 and the fixed contact 31 and between the movable contact 392 and the fixed contact 32. An arc may occur. At this time, as shown in FIGS. 10 and 11, when viewed from the second direction D2 in which the movable contacts 391, 392 and the fixed contacts 31, 32 are opposed by the arc extinguishing mechanism 6 (permanent magnet 61 and yoke 62). In the vicinity of the contact, magnetic flux is generated in the third direction D3 orthogonal to the first direction D1 and the second direction D2 in which the pair of fixed contacts 31 and 32 are arranged. According to Fleming's left-hand rule, a force acts on the arc in the first direction D1 in which the pair of fixed contacts 31 and 32 are arranged. Thereby, the arc generated between the movable contact 391 and the fixed contact 31 can be extended in the direction of the arrow B2, that is, outside. Further, the arc generated between the movable contact 392 and the fixed contact 32 can be extended in the direction of the arrow B3, that is, outside.

In the present embodiment, the yoke 62 includes a pair of adjacent portions 63 and 64 adjacent to the pair of fixed contacts 31 and 32, and has a notch 65 between the pair of adjacent portions 63 and 64. Thereby, the magnetic flux density near the contact can be increased, and the arc can be extended further outward.

Further, in the present embodiment, in the first direction D1 in which the pair of fixed contacts 31 and 32 are arranged side by side, the length L1 of the yoke 62 (see FIG. 10) is the distance L2 between the pair of fixed contacts 31 and 32 ( (See FIG. 10). Furthermore, in the first direction D1, the length L1 of the yoke 62 is longer than the length L3 (see FIG. 8) of the permanent magnet 61. As a result, the arc can be stretched longer, so that the arc can be extinguished early.

Next, the operation of the electromagnetic relay 1 according to this embodiment will be described with reference to FIGS.

First, before the exciting coil 21 is energized, the armature 25 is separated from the iron core 23 while the movable spring 35 is attached to the armature 25, and the pair of movable contacts 391 and 392 form the pair of fixed contacts 31 and Away from 32. Before the excitation coil 21 is energized, the armature 25 is in contact with the stopper 5.

Then, when the exciting coil 21 is energized, the iron core 23 is magnetized, and the armature 25 is attracted to the flange portion 232 of the iron core 23. Along with this, the tip of the movable portion 36 of the movable spring 35 provided with the armature 25 is displaced. After that, the pair of movable contacts 391 and 392 come into contact with the pair of fixed contacts 31 and 32, respectively. As a result, conduction is established between the pair of movable contacts 391 and 392 and the pair of fixed contacts 31 and 32, respectively.

When the exciting coil 21 is energized as described above, the armature 25 separates from the contact portion 53 of the stopper 5. Then, before the movable contacts 391 and 392 contact the fixed contacts 31 and 32, the protrusion 364 of the movable spring 35 contacts the stopper 5 at the contact portion 53 of the stopper 5. This reduces the moving speed of the movable spring 35.

In the electromagnetic relay 1 of the present embodiment, since the protruding portion 364 of the movable spring 35 contacts the stopper 5 before the movable contacts 391, 392 contact the fixed contacts 31, 32, the contact collision of the electromagnetic relay 1 of the present embodiment. The energy M1 (see FIG. 12) can be made smaller than the contact collision energy M2 (see FIG. 13) of the electromagnetic relay of the comparative example that does not include the stopper 5. The contact collision energy M1 is an integrated value of the difference between the attraction force curve N1 (see FIG. 12) and the spring load curve N2 (see FIG. 12). The contact collision energy M2 is an integrated value of the difference between the attraction force curve N3 (see FIG. 13) and the spring load curve N4 (see FIG. 13).

On the other hand, when the energization to the exciting coil 21 is cut off, the iron core 23 is demagnetized, the armature 25 is separated from the collar portion 232 of the iron core 23 by the elastic action of the movable spring 35, and the movable portion 36 of the movable spring 35 is moved. Is displaced. Along with this, the pair of movable contacts 391 and 392 separate from the pair of fixed contacts 31 and 32. As a result, the pair of movable contacts 391 and 392 and the pair of fixed contacts 31 and 32 are electrically disconnected.

When the energization of the exciting coil 21 is cut off as described above, the projecting portion 364 of the movable spring 35 is separated from the stopper 5 by the elastic action of the movable spring 35. The movable portion 36 of the movable spring 35 is displaced. Then, the armature 25 contacts the contact portion 53 of the stopper 5. At this time, since the stopper 5 has elasticity, it absorbs the impact of the movable spring 35.

In the electromagnetic relay 1 according to the present embodiment described above, when the exciting coil 21 is energized, the movable portion 36 moves before the movable contacts 391, 392 of the movable portion 36 of the movable spring 35 contact the fixed contacts 31, 32. The projecting portion 364 comes into contact with the stopper 5. Then, the stopper 5 reduces the moving speed of the movable spring 35. That is, the stopper 5 weakens the movement of the movable spring 35. As a result, in the electromagnetic relay 1 according to the present embodiment, contact collision when the movable contacts 391 and 392 of the movable portion 36 of the movable spring 35 contact the fixed contacts 31 and 32 as compared with the electromagnetic relay that does not include the stopper. Energy can be reduced. As a result, it is possible to reduce the collision noise caused by the movable contacts 391 and 392 of the movable portion 36 of the movable spring 35 contacting the fixed contacts 31 and 32.

Further, in the electromagnetic relay 1 according to the present embodiment, the stopper 5 reduces the moving speed of the movable spring 35, so that the momentum when the armature 25 collides with the iron core 23 can be reduced. As a result, it is possible to reduce the collision sound caused by the armature 25 colliding with the iron core 23.

Furthermore, in the electromagnetic relay 1 according to the present embodiment, the stopper 5 reduces the moving speed of the movable spring 35, so that the contact bounce can be reduced. As a result, it is possible to reduce contact wear due to the arc at the time of contact bounce, and thus it is possible to improve the opening/closing life of the contact.

In the electromagnetic relay 1 according to this embodiment, when the excitation coil 21 is de-energized and the stopper 5 and the armature 25 come into contact with each other, the stopper 5 is elastically deformed, so that the armature at the time of restoration is restored. The impact from 25 to the stopper 5 can be reduced (absorbed/relaxed). As a result, in the electromagnetic relay 1 according to the present embodiment, it is possible to reduce the collision noise caused by the armature 25 colliding with the stopper 5.

In addition, in the electromagnetic relay 1 according to the present embodiment, the stopper 5 and the movable portion 36 (including the movable contacts 391 and 392) of the movable spring 35 are made of metal. As a result, in the electromagnetic relay 1 according to the present embodiment, the stopper 5 and the movable portion 36 (movable contacts 391, 392) of the movable spring 35 are in contact with each other by metal parts. Therefore, when the stopper is a resin part. Compared to, abrasion powder is less likely to be generated. Further, in the electromagnetic relay 1 according to the present embodiment, even if abrasion powder is generated, since the abrasion powder is metal powder, the movable contacts 391 and 392 of the movable portion 36 of the movable spring 35 and the fixed contacts 31 and 32 are Continuity is unlikely to occur.

In the electromagnetic relay 1 according to the present embodiment, the same portion (abutting portion 53) of the stopper 5 contacts the movable spring 35 or the contact portion when the exciting coil 21 is energized and when the exciting coil 21 is de-energized. It contacts the pole 25. Thereby, in the electromagnetic relay 1 according to the present embodiment, the structure of the stopper 5 can be simplified as compared with the stopper having different contact portions. In addition, in the electromagnetic relay 1 according to the present embodiment, a component with which the movable spring 35 abuts when the exciting coil 21 is energized and a component with which the armature 25 abuts when the exciting coil 21 is de-energized. The number of parts can be reduced as compared with the case where the components are separately provided.

In the electromagnetic relay 1 according to the present embodiment, even if the permanent magnet 61 is installed at a location apart from the contacts (fixed contacts 31, 32, movable contacts 391, 392), the yoke 62 is used to allow the vicinity of the contacts and the arc. The magnetic flux density in the arc extinguishing space can be increased. As a result, the breaking capability can be enhanced without increasing the size of the electromagnetic relay 1.

In the electromagnetic relay 1 according to the present embodiment, the yoke 62 has the notch 65 between the pair of adjacent portions 63 and 64 adjacent to the pair of fixed contacts 31 and 32, thereby concentrating the magnetic flux in the vicinity of each contact. You can As a result, the magnetic flux density in the vicinity of each contact can be made larger than that in the electromagnetic relay in which the yoke does not have the above-mentioned notch, so that the breaking ability can be further improved.

In the electromagnetic relay 1 according to the present embodiment, the length L1 of the yoke 62 is set to the pair of fixed contacts 31, 32 in the direction in which the pair of fixed contacts 31, 32 are arranged (first direction D1), that is, the direction in which the arc is extended. By making it longer than the distance L2 between them, the arc can be stretched longer. As a result, the arc can be extinguished at an early stage, so that the breaking capability can be further enhanced.

As a modification of the present embodiment, the electromagnetic relay 1 may include a stopper 5a as shown in FIG. 14 instead of the stopper 5. The stopper 5a integrally includes a base portion 51a, an extension portion 52a, and a contact portion 53a. The base 51a has the same configuration as the base 51 of the stopper 5 (see FIG. 3). The through hole 54a, the recess 55a and the contact piece 56a are the same as the through hole 54, the recess 55 and the contact piece 56 (see FIG. 3) of the stopper 5, respectively. The extended portion 52a has the same configuration as the extended portion 52 (see FIG. 3) of the stopper 5.

The contact portion 53a projects from the tip of the extending portion 52a so as to form an angle of less than 90° with the extending portion 52a. That is, the contact portion 53a is provided such that the tip end is closer to the base portion 51a than the base end side. The contact portion 53a is the same as the contact portion 53 (see FIG. 3) of the stopper 5 except the above.

As another modification of the present embodiment, the electromagnetic relay 1 may include a stopper 5b as shown in FIG. 15, instead of the stopper 5. The stopper 5b integrally includes a base portion 51b, an extending portion 52b, and an abutting portion 53b. The base portion 51b has the same configuration as the base portion 51 (see FIG. 3) of the stopper 5. The through hole 54b, the recess 55b and the contact piece 56b are the same as the through hole 54, the recess 55 and the contact piece 56 (see FIG. 3) of the stopper 5, respectively. The extended portion 52b has the same configuration as the extended portion 52 (see FIG. 3) of the stopper 5.

The contact portion 53b is formed in a curved plate shape. More specifically, the contact portion 53b integrally includes a first curved surface portion 531 and a second curved surface portion 532. The first curved surface portion 531 is provided at the tip of the extended portion 52b. The first curved surface portion 531 has a curved surface where the movable contacts 391 and 392 of the movable portion 36 are convex in the direction A1 away from the fixed contacts 31 and 32. The second curved surface portion 532 is provided at the tip of the first curved surface portion 531. The second curved surface portion 532 has a curved surface that is convex in the direction A2 in which the movable contacts 391 and 392 of the movable portion 36 approach the fixed contacts 31 and 32. The contact portion 53b is the same as the contact portion 53 (see FIG. 3) of the stopper 5 except for the above points.

Further, as a modified example of the present embodiment, in the movable spring 35 of the electromagnetic relay 1, the movable portion 36 may include a protrusion 365 as shown in FIG. 16 instead of the protrusion 364.

The protrusion 365 is provided between the pair of movable contacts 391 and 392. More specifically, the protruding portion 365 is provided between the pair of movable contacts 391 and 392 so as to protrude from the molding portion 363. The protrusion 365 has a hole 366. Thereby, even if the width of the protrusion 365 is widened to increase the contact area between the protrusion 365 and the stopper 5, the elasticity of the protrusion 365 can be maintained.

In the electromagnetic relay 1 according to this embodiment, the permanent magnet 61 may be arranged with the N pole and the S pole reversed. That is, the permanent magnet 61 may be arranged so that the exciting coil 21 side has an N pole and the yoke 62 side has an S pole. In this case, it is necessary to reverse the polarities of the main terminals 33 and 34. Thereby, the arc generated between the movable contacts 391 and 392 and the fixed contacts 31 and 32 can be extended to the outside.

The electromagnetic relay 1 according to this embodiment may have a configuration that does not include the movable contacts 391 and 392. In this case, a portion of the movable portion 36 of the movable spring 35 facing the fixed contact 31 comes in contact with and separates from the fixed contact 31, and a portion of the movable portion 36 facing the fixed contact 32 comes into contact with and separates from the fixed contact 32. That is, when the exciting coil 21 is energized, the movable portion 36 contacts the fixed contacts 31, 32, and when the exciting coil 21 is de-energized, the movable portion 36 separates from the fixed contacts 31, 32.

1 Electromagnetic Relay 21 Excitation Coil 25 Armature 31, 32 Fixed Contact 35 Movable Spring 4 Case 43 Recess 61 61 Permanent Magnet (Magnet)
62 York

Claims (5)

An exciting coil,
Terminals,
A fixed contact provided on the terminal,
A movable contact provided on the movable spring or composed of a portion of the movable spring facing the fixed contact, and the movable spring moves with the fixed portion as a fulcrum based on on/off of energization to the exciting coil, Moving the movable contact in the direction of moving toward and away from the fixed contact,
A stopper for suppressing the movement of the movable spring,
An armature attached to the movable spring and displaced integrally with the movable spring,
A case that houses the fixed contact, the movable spring, the stopper, and the armature;
Equipped with
The stopper contacts the armature when the excitation coil is de-energized.
Electromagnetic relay. The stopper is made of a non-magnetic material,
The electromagnetic relay according to claim 1. Furthermore, a bobbin for winding the exciting coil is provided,
The stopper has a base portion, an extension portion, and a contact portion,
The base is fixed to the bobbin,
The extension portion extends from the base portion to reach the contact portion,
The contact portion is provided substantially parallel to the base portion,
The armature contacts the contact portion,
The electromagnetic relay according to claim 1 or 2. The contact portion has elasticity,
The electromagnetic relay according to claim 3. Furthermore,
A yoke provided adjacent to the fixed contact and the movable contact and on the opposite side of the movable contact from the fixed portion;
A magnet that contacts the yoke,
Equipped with
The magnet and the yoke generate a magnetic flux in the vicinity of the movable contact and the fixed contact,
The magnet is provided in the vicinity of the fixed contact and the movable contact in the direction,
The electromagnetic relay according to any one of claims 1 to 4.

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