JP2019192545A - Electromagnetic relay - Google Patents

Abstract

To provide an electromagnetic light electrical machine capable of suppressing an increase in the weight of a mover and improving the Lorentz force without using a magnet having a high magnetic flux density and suppressing the opening of a contact portion.SOLUTION: One end of a magnetism collecting yoke 24 is opposed to the N pole of an arc extinguishing magnet 23, and the other end is opposed to the S pole of the arc extinguishing magnet 23 via a first fixed contact 27 or a second fixed contact 28. This makes it possible to generate a Lorentz force in a direction that sufficiently suppresses the opening of a contact portion without providing a yoke integrated with a movable contact 20. For this reason, it becomes possible to suppress the weight increase of a mover.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electromagnetic relay that opens and closes an electric circuit by moving a movable contact and a fixed contact.

  In a vehicle including a high voltage battery and an inverter, the electromagnetic relay plays a role of turning on / off power supply to the inverter. The electromagnetic relay has a structure including a fixed terminal having two fixed contacts and a mover having two movable contacts corresponding to the two fixed contacts. The mover is moved to connect the movable contact and the fixed contact. The electrical circuit is turned on and off by separating them. When the movable contact and the fixed contact are in electrical contact with each other and a short-circuit current of several thousand amperes flows in this state due to a short circuit failure of the inverter in this state, the contact between the contacts or between the stator and the mover A repulsive force (hereinafter referred to as an electromagnetic repulsive force) acts to open the contact portion. However, in order to cut off the current by a fuse separately provided from the electromagnetic relay, the relay is required not to be disconnected even in the case of a short circuit failure in which an electromagnetic repulsive force acts.

  In addition, the electromagnetic relay is equipped with an arc extinguishing magnet to extinguish the arc generated at the contact portion, and the electromagnetic force based on Fleming's left hand rule, that is, the Lorentz force is applied to the arc to change the direction of the force. It can be extinguished by changing it.

  For example, in Patent Document 1, an electromagnetic wave that can suppress the separation of the contact portion between the movable contact and the fixed contact using a magnetic flux generated by an arc extinguishing magnet for extinguishing an arc generated in the contact portion. Relays have been proposed. In this electromagnetic relay, the movable plate is provided with a counter plate portion facing the arc extinguishing magnet, and the Lorentz force generated by the current flowing through the counter plate portion and the magnetic flux of the arc extinguishing magnet abuts the movable contact and the fixed contact. To prevent the contact portion from being separated.

  There is also a structure in which a movable yoke is provided on the mover, a fixed yoke is provided on the stator facing the mover, and a magnetic force generated by the current of the mover is used to generate an attractive force between the yokes. Thus, based on the attractive force generated between the yokes, it is possible to suppress the opening of the contact portion between the movable contact and the fixed contact.

JP 2012-256482 A

  However, as the current increases in recent years, the current flowing through the relay has increased and the electromagnetic repulsion force has increased, and when an increase in the Lorentz force is required as the electromagnetic repulsion force increases, A magnet is required.

  In addition, when improvement in the attractive force between the yokes is required as the electromagnetic repulsion increases, the size of the movable yoke is increased to avoid the magnetic saturation of the movable yoke, and the weight of the mover is increased. This leads to a decrease in the shut-off performance.

  In view of the above points, the present invention provides an electromagnetic relay capable of suppressing the increase in the weight of the mover and improving the Lorentz force without using a magnet having a high magnetic flux density, thereby suppressing the opening of the contact portion. Objective.

  In order to achieve the above object, the invention described in claim 1 has an exciting coil (12) that forms a magnetic field when energized and a movable contact (29, 30), and is moved based on energization to the exciting coil. The movable contact (20), the fixed terminal (25, 26) having the fixed contact (27, 28) in contact with the movable contact, and the movable contact and fixed when the movable contact is moved when the excitation coil is energized. An arc extinguishing magnet (23, 231 and 232) for extinguishing an arc generated at the contact portion when switching from an on state in which the contact abuts to an off state in which the movable contact and the fixed contact are separated from each other; One end of the magnet for use in opposition to one magnetic pole and the other end from which the magnetic flux from the arc-extinguishing magnet is guided, and the other end is extinguished via a contact portion between a movable contact and a fixed contact Placed opposite the other magnetic pole of the magnet It is provided with a magnetic yoke (24,241,242), a. In such a configuration, when in the ON state, a current is caused to flow to the fixed terminal through the movable contact via the contact portion between the movable contact and the fixed contact, and the current flowing through the movable contact and the magnetic flux collecting yoke guide the current. A Lorentz force is generated by the magnetic flux in a direction in which the movable contact and the fixed contact abut.

  In this way, one end of the magnetism collecting yoke is opposed to one magnetic pole of the arc extinguishing magnet, and the other end is opposed to the other magnetic pole of the arc extinguishing magnet through the fixed contact. Accordingly, it is possible to generate a Lorentz force in a direction that sufficiently suppresses the opening of the contact portion without providing a yoke integrated with the movable contact. For this reason, it becomes possible to suppress the weight increase of a needle | mover. Therefore, it is possible to obtain an electromagnetic relay that can suppress the increase in the weight of the mover, improve the Lorentz force without using a magnet with a high magnetic flux density, and suppress the opening of the contact portion.

  Reference numerals in parentheses attached to each component and the like indicate an example of a correspondence relationship between the component and the like and specific components described in the embodiments described later.

It is front sectional drawing which shows the structure of the electromagnetic relay which concerns on 1st Embodiment. It is the elements on larger scale which took out the contact part vicinity of the electromagnetic relay of FIG. 1, and was seen from upper direction. FIG. 3 is an enlarged view of the vicinity of a contact portion when FIG. 2 is viewed from below in the drawing. It is the elements on larger scale which took out the contact part vicinity among the electromagnetic relays demonstrated by the modification of 1st Embodiment, and was seen from upper direction. It is the elements on larger scale which took out the contact part vicinity of the electromagnetic relay which concerns on 2nd Embodiment, and was seen from upper direction. It is the elements on larger scale which took out the contact part vicinity among the electromagnetic relays which concern on 3rd Embodiment, and were seen from upper direction. FIG. 7 is an enlarged view of the vicinity of a contact portion when FIG. 6 is viewed from the lower side of the drawing. It is the elements on larger scale which took out the contact part vicinity among the electromagnetic relays demonstrated by the modification of 3rd Embodiment, and was seen from upper direction. It is the elements on larger scale which took out the contact part vicinity among the electromagnetic relays which concern on 4th Embodiment, and were seen from upper direction. FIG. 10 is an enlarged view of the vicinity of the contact portion when FIG. 9 is viewed from the lower side of the drawing. It is the elements on larger scale which took out the contact part vicinity among the electromagnetic relays which concern on 5th Embodiment, and were seen from upper direction. It is the elements on larger scale which took out the contact part vicinity among the electromagnetic relays demonstrated in the modification of 5th Embodiment, and was seen from upper direction. It is the elements on larger scale which took out the contact part vicinity of the electromagnetic relay which concerns on 6th Embodiment, and was seen from upper direction. It is the elements on larger scale which took out the contact part vicinity among the electromagnetic relays demonstrated by the modification of 6th Embodiment, and was seen from upper direction. It is the elements on larger scale which took out the contact part vicinity of the electromagnetic relay which concerns on 7th Embodiment, and was seen from upper direction. It is the elements on larger scale which took out the contact part vicinity of the electromagnetic relay which concerns on 8th Embodiment, and was seen from upper direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
A first embodiment will be described. The electromagnetic relay of this embodiment is demonstrated with reference to FIGS. For convenience, the upper direction, the lower direction, and the left and right direction in FIG. 1 will be described as the upper direction, the lower direction, and the left and right direction of the electromagnetic relay, respectively. It does not mean that.

  As shown in FIG. 1, the electromagnetic relay includes a case 11, an exciting coil 12, a fixed core 13, a yoke 14, a movable core 15, a return spring 16, a shaft 17, a base 18, an insulating resin 19, a movable contact 20, and a support frame. 21, a contact pressure spring 22, an arc extinguishing magnet 23, and a magnetic collecting yoke 24.

  The case 11 is made of a nonmagnetic and nonconductive material such as a resin. Each component constituting the electromagnetic relay is accommodated in a space configured in the case 11.

  The exciting coil 12 forms a magnetic field when energized, has a substantially cylindrical shape, and is wound around a bobbin 12a having a hollow cylindrical portion. Energization of the exciting coil 12 is performed through an external connection terminal (not shown). A fixed core 13 and the like are disposed in a central hole formed in the inner diameter portion of the exciting coil 12.

  The fixed core 13 is made of a magnetic material and is formed of a substantially columnar member having a size corresponding to the central hole of the exciting coil 12 and constitutes a part of the magnetic circuit. The fixed core 13 has a structure in which a through hole 13a is formed along the central axis, and one end of the shaft 17 is located in the through hole 13a.

  The yoke 14 is a magnetic member that surrounds the exciting coil 12. The yoke 14 is disposed so as to cover the outer peripheral side of the exciting coil 12 and one of the end portions in the axial direction, constitutes a part of the magnetic circuit, and has an opening corresponding to the position of the fixed core 13 on one side in the axial direction. The yoke hole 142a is formed.

  In the case of this embodiment, the yoke 14 is configured to have a first member 141 and a second member 142. The first member 141 is a member called stationary, and has a structure in which a plate material made of a magnetic material is bent into a substantially U shape. The first member 141 covers the outer peripheral side of the exciting coil 12 and one axial end side of the exciting coil 12. The second member 142 is a member called a top plate, is made of a magnetic material, and is formed of, for example, a circular flat plate or a rectangular flat plate, and covers the other axial end of the exciting coil 12. The second member 142 is disposed so as to face the movable core 15 described later, and is joined to the first member 141.

  An opening 141a is formed in the first member 141 at a position corresponding to the fixed core 13, and a part of the fixed core 13 is fitted into the opening 141a so that the fixed core 13 and the first member 141 Are joined. In the second member 142, the yoke hole 142a is formed at the center so as to penetrate the second member 142. The shape of the yoke hole 142 a, that is, the inner peripheral shape of the second member 142 is a shape corresponding to the movable core 15.

  The movable core 15 is a disk-shaped member made of a magnetic material disposed at a position corresponding to the yoke hole 142 a in the second member 142. A through hole 15 a into which a shaft 17 described later is inserted is formed on the central axis of the movable core 15. The movable core 15 is located at a rest position away from the yoke 14 when the excitation coil 12 is not energized, and is magnetically attracted toward the yoke 14 when the excitation coil 12 is energized. Then, it is brought into contact with the second member 142 of the yoke 14. The outer peripheral shape of the movable core 15 is a shape corresponding to the inner peripheral shape of the yoke hole 142a, and the opposite side of the fixed core 13 has a flange shape whose diameter is larger than that of the fixed core 13 side. Is brought into contact with the inner wall surface of the yoke hole 142a.

  In the present embodiment, a stopper portion 15b into which the return spring 16 is fitted is provided on one surface of the movable core 15 on the return spring 16 side. The stopper portion 15b is configured by a protruding portion that protrudes in an annular shape from one surface of the movable core 15 on the return spring 16 side, and the return spring 16 is fitted on the outer peripheral surface thereof.

  The return spring 16 is disposed between the fixed core 13 and the step portion of the inner wall surface of the exciting coil 12, and biases the movable core 15 to the opposite side to the fixed core 13. When energizing the exciting coil 12, the movable core 15 is attracted toward the fixed core 13 against the return spring 16 by electromagnetic attraction force.

  As described above, the fixed core 13, the yoke 14, and the movable core 15 are made of a magnetic material, and when energizing the exciting coil 12, a magnetic circuit of magnetic flux induced by the exciting coil 12 is formed. .

  The shaft 17 is made of, for example, a nonmagnetic material, and can be moved integrally with the movable core 15 by being coupled to the movable core 15. More specifically, the shaft 17 is coupled to the movable core 15 while being inserted into a through hole 15 a formed in the movable core 15. One end of the shaft 17 protrudes toward the fixed core 13 and enters a through-hole 13 a formed in the fixed core 13.

  In addition, a flange portion 17 a in which the outer diameter of a part of the shaft 17 is enlarged is formed at a position corresponding to one surface of the movable core 15 on the fixed core 13 side of the shaft 17. When the exciting coil 12 is energized, the movable core 15 pushes the flange portion 17a, whereby the shaft 17 is moved to the fixed core 13 side.

  Further, an insulating resin 19 is attached to one end of the shaft 17 on the side opposite to the fixed core 13. The insulating resin 19 is brought into contact with the movable contact 20, and the movable contact 20 is positioned in the axial direction of the shaft 17.

  In the case of the present embodiment, the movable core 15, the shaft 17, the insulating resin 19, the movable contact 20, and the like are moved forward and backward by energization and non-energization of the excitation coil 12.

  The base 18 is made of a nonmagnetic insulating material, such as resin, and is fixed to the case 11. The base 18 has an opening 18a at the center, and the shaft 17 and the insulating resin 19 are inserted into the opening 18a. The base 18 is fixed to the case 11 in contact with the yoke 14. The base 18 is provided with a plate-like first fixed terminal 25 and a second fixed terminal 26 made of conductive metal.

  In the present embodiment, as shown in FIGS. 1 to 3, the first fixed terminal 25 and the second fixed terminal 26 are drawn out to the other side of the sheet of FIG. 1 and FIG. 3, that is, toward the upper side of the sheet of FIG. Yes. Through this portion, the first fixed terminal 25 and the second fixed terminal 26 are connected to an external wiring or the like. In addition, the first fixed terminal 25 and the second fixed terminal 26 have bent portions 25a and 26a that are bent toward the upper side of FIG. 1 and FIG. It has a structure with.

  The first fixed terminal 25 and the second fixed terminal 26 constitute a part of the wiring of the electric circuit that is subject to on / off control by the electromagnetic relay. Further, a first fixed contact 27 is attached to be connected to the first fixed terminal 25, and a second fixed contact 28 is attached to be connected to the second fixed terminal 26. The bent portions 25a and 26a are provided above the first fixed contact 27 and the second fixed contact 28, respectively, on the upper side of the drawing in FIG. 2, and are bent toward the front side of the drawing in FIG. It is said that it was bent.

  One surface of the base 18 facing the movable core 15 serves as a stopper 18b so that the movement of the movable core 15 to the opposite side of the fixed core 13 is restricted.

  The movable contact 20 is operated to follow the movable core 15 and is composed of a plate member made of conductive metal. For example, the movable contact 20 is formed as two movable contacts made of conductive metal at symmetrical positions around the shaft 17. The first movable contact 29 and the second movable contact 30 are fixed.

  The movable contact 20 is disposed on the other end side of the shaft 17 opposite to the end inserted into the fixed core 13. One surface of the movable contact 20 on the fixed core 13 side is in contact with the insulating resin 19, and the movable contact 20 is positioned at the position of the insulating resin 19.

  As shown in FIG. 2, the movable contact 20 has a notch 20 a corresponding to the first notch, and the notch 20 a is provided between the first movable contact 29 and the second movable contact 30. By being positioned, when a movable element current is caused to flow through the movable contact 20, it flows around the notch 20a. That is, a portion of the movable contact 20 outside the notch 20 a becomes an extending portion that extends the distance of the current path between the first movable contact 29 and the second movable contact 30. Then, the current flow in the extending portion, in other words, the current flow through the first movable contact 29 and the second movable contact 30 is substantially parallel to the vertical direction of the drawing in FIG.

  In the case of this embodiment, while forming the movable contact 20 with a rectangular plate-shaped member, the two notches 20a are formed so as to sandwich the center of the rectangle from one side on the upper side of the sheet of FIG. . For this reason, for example, the insulating resin 19 is brought into contact with the rectangular center position, and the notches 20a are positioned on both sides thereof. The movable contact 20 having such a structure can be easily manufactured by bending, punching, or notching a plate material.

  The support frame 21 is fixed to the case 11 and is brought into contact with the base 18. An annular groove 21 a is formed at the center position of the support frame 21, and the contact pressure spring 22 is supported by fitting one end side of the contact pressure spring 22.

  The contact pressure spring 22 is disposed between the movable contact 20 and the support frame 21 and urges the movable contact 20 toward the shaft 17, that is, the first fixed contact 27 and the second fixed contact 28. Yes.

  For this reason, when the shaft 17 and the insulating resin 19 are moved along with the movement of the movable core 15, the movable contact 20 is also made to follow based on the elastic force of the contact pressure spring 22. Even if vibration or the like occurs when the first movable contact 29 and the second movable contact 30 are in contact with the first fixed contact 27 and the second fixed contact 28, the first movable contact 29 and the first fixed contact The connection between the contact 27 and the second movable contact 30 and the second fixed contact 28 is maintained.

  The arc extinguishing magnet 23 is provided to extinguish the arc generated at the contact portion when switching from the on state to the off state, and applies an electromagnetic force based on Fleming's left hand rule, that is, a Lorentz force to the arc. The arc is extinguished by changing the direction of the force. In the present embodiment, the arc-extinguishing magnet 23 is constituted by a first magnet 231 and a second magnet 232 arranged on both sides of the first fixed contact 27 and the second fixed contact 28 so as to sandwich the first fixed contact 27 and the second fixed contact 28. Yes.

  In both the first magnet 231 and the second magnet 232, the N pole is directed to the opposite side of the first fixed contact 27 and the second fixed contact 28, and the S pole is directed to the first fixed contact 27 and the second fixed contact 28 side. Arranged to be directed.

  Furthermore, in the present embodiment, the contact portions of the first movable contact 29 and the first fixed contact 27 and the first fixed contact 27 are utilized by using the magnetic flux generated by the first magnet 231 and the second magnet 232 and the magnetism collecting yoke 24 described later. It also serves to suppress the opening of the contact portion between the second movable contact 30 and the second fixed contact 28.

  The magnetic flux collecting yoke 24 is for guiding the magnetic flux generated from one magnetic pole of the arc extinguishing magnet 23 to the other magnetic pole, and is made of a soft magnetic material. The magnetism collecting yoke 24 is constituted by a U-shaped plate-like member, and the first yoke 241, the second fixed contact 28 and the second magnet arranged around the first fixed contact 27 and the first magnet 231. The second yoke 242 is arranged around the H.232.

  As shown in FIG. 2, the first yoke 241 has one end opposed to the north pole of the first magnet 231 and the other end opposed to the south pole of the first magnet 231 across the first fixed contact 27. It has been. More specifically, the first yoke 241 is disposed so that one end thereof is in contact with the N pole of the first magnet 231, and the first fixed contact 27 is more bent than the bent portion 25 a of the first fixed terminal 25 at the U-shaped bottom. The other end enters into the notch 20a of the movable contact 20, bypassing the distant position. The other end of the first yoke 241 is in the same direction as the portion of the first fixed terminal 25 where the first fixed contact 27 is disposed, here the portion closer to the first fixed contact 27 than the bent portion 25a. It is extended.

  The second yoke 242 has one end opposed to the north pole of the second magnet 232 and the other end opposed to the south pole of the second magnet 232 across the second fixed contact 28. More specifically, the second yoke 242 is disposed so that one end thereof is in contact with the N pole of the second magnet 232, and the second fixed contact 28 is more bent than the bent portion 26 a of the second fixed terminal 26 at the U-shaped bottom. The other end enters into the notch 20a of the movable contact 20, bypassing the distant position. The other end of the second yoke 242 is in the same direction as a portion of the second fixed terminal 26 where the second fixed contact 28 is disposed, here, a portion closer to the second fixed contact 28 than the bent portion 26a. It is extended.

  The electromagnetic relay concerning this embodiment is comprised by the above structures. Next, the operation of the electromagnetic relay configured as described above will be described.

  First, when the excitation coil 12 is not energized, a magnetic circuit based on the energization of the excitation coil 12 is not formed, and the movable core 15 is not magnetically attracted to the fixed core 13 side. Therefore, the movable parts such as the movable core 15 and the movable contact 20 are arranged at the positions shown in FIG. 1, and the first movable contact 29 and the second movable contact 30 are the first fixed contact 27 and the second fixed contact. It will be in the state away from 28. Therefore, the first fixed terminal 25 and the second fixed terminal 26 are electrically separated, and the electromagnetic relay is turned off.

  Subsequently, when the electromagnetic relay is turned on, the excitation coil 12 is energized. For this reason, a magnetic circuit of magnetic flux induced based on energization to the exciting coil 12 is formed, and the movable core 15 is magnetically attracted to the fixed core 13 side. When the movable core 15 is magnetically attracted to the fixed core 13 side, the insulating resin 19 with which the movable contact 20 abuts is also moved to the fixed core 13 side. Therefore, the movable contact 20 and the first movable contact 29 and the second movable contact 30 also move following the movable core 15 based on the elastic force of the contact pressure spring 22.

  Accordingly, the first movable contact 29 and the second movable contact 30 come into contact with the first fixed contact 27 and the second fixed contact 28, and the first fixed contact 27 and the second fixed contact 28 are electrically connected. It is done. Then, the first fixed terminal 25 and the second fixed terminal 26 are brought into conduction, and the electromagnetic relay is turned on. As a result, the external wirings connected to the first fixed terminal 25 and the second fixed terminal 26 are made conductive, and the current path indicated by the white arrow in FIG. 2 is formed.

  Further, when the electromagnetic relay is switched from the on state to the off state, the energization to the exciting coil 12 is interrupted. Thereby, the magnetic attractive force generated based on the energization of the exciting coil 12 is released. For this reason, the movable core 15 is moved to the opposite side to the fixed core 13 based on the elastic force of the return spring 16. Accordingly, the first movable contact 29 and the second movable contact 30 are separated from the first fixed contact 27 and the second fixed contact 28, and the electrical connection between the first fixed contact 27 and the second fixed contact 28 is interrupted, The electromagnetic relay is turned off. Note that a short-circuit current path that generates an electromagnetic repulsion force when a short-circuit fault occurs in an inverter or the like is also the current path.

  When performing such an operation, as described above, in the electromagnetic relay of the present embodiment, one end of the first yoke 241 faces the north pole of the first magnet 231 and the other end sandwiches the first fixed contact 27. The first magnet 231 is opposed to the south pole. More specifically, the first yoke 241 is disposed so as to sandwich the extended portion of the movable contact 20 that extends from the first fixed contact 27 and the first movable contact 29 downward in the drawing. Therefore, the magnetic flux generated from the first magnet 231 is guided by the first yoke 241 and flows as indicated by the solid line arrow in FIG. That is, the magnetic flux generated from the N pole of the first magnet 231 is guided from one end of the first yoke 241 to the other end, and further from the other end of the first yoke 241 toward the S pole of the first magnet 231.

  Similarly, one end of the second yoke 242 faces the north pole of the second magnet 232, and the other end faces the south pole of the second magnet 232 with the second fixed contact 28 interposed therebetween. More specifically, the second yoke 242 is disposed so as to sandwich the extended portion of the movable contact 20 that extends from the second fixed contact 28 and the second movable contact 30 downward in the drawing. For this reason, the magnetic flux generated from the second magnet 232 is guided by the second yoke 242 and flows as indicated by the solid line arrow in FIG. That is, the magnetic flux generated from the N pole of the second magnet 232 is guided from one end of the second yoke 242 to the other end, and further from the other end of the second yoke 242 to the S pole of the second magnet 232.

  Therefore, the magnetic flux guided by the magnetic flux collecting yoke 24 can be effectively linked to the mover current flowing through the movable contact 20, and a downward Lorentz force can be generated. That is, it is possible to generate a force for urging the first movable contact 29 and the second movable contact 30 toward the first fixed contact 27 and the second fixed contact 28. In particular, in the extending part of the movable contact 20 outside the notch 20a, it is possible to pass a current in a direction parallel to the vertical direction in FIG. Thus, the above-mentioned effect can be obtained by providing the extending portion and efficiently obtaining the current component that intersects the magnetic flux.

  Further, the magnetic collecting yoke 24 is configured to bypass the bent portions 25a and 26a in the first fixed terminal 25 and the second fixed terminal 26. For this reason, the magnetic flux generated around these by the current flowing through the first fixed terminal 25 and the second fixed terminal 26 can also be collected. For this reason, the amount of magnetic flux linked to the movable contact 20, the first movable contact 29, and the second movable contact 30 can be further increased, and the Lorentz force can be increased.

  Further, since the magnetic flux that has been released to the space in the past can be collected by the magnetic collecting yoke 24 and linked to the movable contact 20, the first movable contact 29, and the second movable contact 30, the arc interruption performance is also improved. Can be planned.

  As described above, in the electromagnetic relay of the present embodiment, one end of the magnetism collecting yoke 24 is opposed to the N pole of the arc extinguishing magnet 23 and the other end is interposed via the first fixed contact 27 or the second fixed contact 28. The arc-extinguishing magnet 23 is opposed to the south pole. This makes it possible to generate a Lorentz force in a direction that sufficiently suppresses the opening of the contact portion without providing a yoke integrated with the movable contact 20. For this reason, it becomes possible to suppress the weight increase of a needle | mover. Therefore, it is possible to obtain an electromagnetic relay that can suppress the increase in the weight of the mover, improve the Lorentz force without using a magnet with a high magnetic flux density, and suppress the opening of the contact portion. In addition, since the increase in the weight of the mover is suppressed, it is possible to increase the opening speed when the contact portion is opened, and it is possible to suppress contact wear when the arc is interrupted. Furthermore, since each of the two contact portions has a structure including the magnetic collecting yoke 24, the same effect can be obtained on both sides of the movable contact 20 in the left-right direction.

  Further, the direction of the magnetic flux from the other end of the first yoke 241 toward the first magnet 231 is the same as the direction of the magnetic flux generated when a current flows through the portion of the first fixed terminal 25 on the first fixed contact 27 side. It becomes the direction. Similarly, the direction of the magnetic flux from the other end of the second yoke 242 toward the second magnet 232 and the direction of the magnetic flux generated when a current flows through the portion of the second fixed terminal 26 on the second fixed contact 28 side, The same direction. Therefore, the amount of magnetic flux interlinked with the mover current flowing through the movable contact 20 can be increased, and a larger downward Lorentz force can be generated.

  Furthermore, the magnetism collecting yoke 24 can be easily manufactured by punching or bending such as SPCC. For example, since the plate width is several mm, it is possible to suppress an increase in the size of the contact portion to a minimum.

(Modification of the first embodiment)
The configuration of the first yoke 241 and the second yoke 242 may be changed with respect to the first embodiment. Specifically, as shown in FIG. 4, the first yoke 241 passes through the first fixed contact 27 side of the bent portion 25 a of the first fixed contact 27. Similarly, the second yoke 242 passes through the second fixed contact 28 side rather than the bent portion 26 a of the second fixed contact 28.

  In such a configuration, the first yoke 241 does not bypass the side away from the first fixed contact 27 with respect to the bent portion 25a, and the second yoke 242 moves away from the second fixed contact 28 with respect to the bent portion 26a. Do not bypass the side. Therefore, in the magnetic flux collecting yoke 24, the magnetic flux of the arc extinguishing magnet 23 and the magnetic flux of the stator current flowing through the first fixed terminal 25 and the second fixed terminal 26 cancel each other in opposite directions. Therefore, compared with the first embodiment, the amount of magnetic flux interlinked at the contact portion is reduced, but the same effect as that of the first embodiment can be obtained.

(Second Embodiment)
A second embodiment will be described. In the present embodiment, the configuration of the movable contact 20 is changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment. Therefore, only different portions from the first embodiment will be described.

  As shown in FIG. 5, in this embodiment, in addition to the notch part 20a, the notch part 20b is further formed with respect to the movable contactor 20. As shown in FIG. The cutout portion 20b corresponds to a second cutout portion, and the cutout portion 20a of the movable contactor 20 is located between the two cutout portions 20a, specifically at the center position in the longitudinal direction of the movable contactor 20. Is formed from one side opposite to the one side formed.

  Thus, the notch 20b is provided at the center position of the movable contact 20. Therefore, between the magnetic flux toward the arc extinguishing magnet 23 far from the tip of the magnetism collecting yoke 24 and the mover current at the center of the movable contact 20 as shown by the arrow in FIG. The Lorentz force on the other side of the paper can be obtained. Accordingly, it is possible to increase the force for urging the first movable contact 29 and the second movable contact 30 to the first fixed contact 27 and the second fixed contact 28, and to further suppress the opening of the contact portion. Become.

(Third embodiment)
A third embodiment will be described. In this embodiment, the configuration of the movable contact 20 is changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment. Therefore, only different portions from the first embodiment will be described.

  As shown in FIGS. 6 and 7, in the present embodiment, a portion of the movable contact 20 between the first movable contact 29 and the second movable contact 30 is directed upward, that is, away from the fixed core 13. It is a protruding convex part. The other ends of the first yoke 241 and the second yoke 242 pass through the inside of the convex portion and protrude beyond the movable contact 20.

  With such a structure, the area where the other end of the magnetism collecting yoke 24 faces the arc extinguishing magnet 23 can be increased. As a result, the amount of magnetic flux linked to the movable contact 20, the first movable contact 29, and the second movable contact 30 can be further increased, the Lorentz force can be increased, and the arc interruption performance can be improved. Is possible.

(Modification of the third embodiment)
In the third embodiment, the magnetism collecting yoke 24 may have an annular structure as shown in FIG. Specifically, the first yoke 241 has a portion that wraps around the lower part of the paper surface in addition to the portion that wraps around the upper surface of FIG. Has been. In addition, the second yoke 242 has a portion that wraps around the lower side of the paper surface in addition to the portion that wraps around the upper surface of FIG. 8 with respect to the contact portion from one end to the other end. .

  With such a structure, as shown in the figure, the magnetic flux can flow through both the upper and lower sides of the sheet with the arc extinguishing magnet 23 interposed therebetween. The magnetic resistance to the 20 side can be reduced.

  In the third embodiment and the structure of FIG. 8 described above, as in the first embodiment, the first yoke 241 and the second yoke 242 have the first fixed contact 27 and the second yoke 252 rather than the bent portions 25a and 26a. (2) A structure in which a position away from the fixed contact 28 is bypassed may be used.

(Fourth embodiment)
A fourth embodiment will be described. In the present embodiment, the configuration of the magnetism collecting yoke 24 is changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment. Therefore, only different portions from the first embodiment will be described.

  As shown in FIGS. 9 and 10, in the present embodiment, the magnetism collecting yoke 24 has a structure that passes below the contact portion. Specifically, the first yoke 241 passes under the contact portion between the first magnet 231 and the first fixed contact 27 and the first movable contact 29 from one end of the first magnet 231 facing the N pole. A structure is provided that reaches the other end of the first magnet 231 across the contact portion. The second yoke 242 passes from one end of the second magnet 232 facing the north pole of the second magnet 232 below the contact portion between the second magnet 232 and the second fixed contact 28 and the second movable contact 30, and sandwiches the contact portion. The structure reaches the other end on the opposite side of the second magnet 232.

  With such a structure, there is no need for a space for drawing the magnetic collecting yoke 24 in the direction in which the first fixed terminal 25 and the second fixed terminal 26 are pulled out, that is, above the plane of FIG. 9, and the electromagnetic relay in that direction. The increase in physique can be suppressed. Further, by adopting a structure including the magnetic collecting yoke 24 so as to pass below each contact portion, the direction of the magnetic flux of the arc extinguishing magnet 23 in the magnetic collecting yoke 24 and the magnetic flux of the stator current can be matched. Therefore, the Lorentz force can be improved without canceling out the magnetic fluxes of the two. Therefore, it is possible to further suppress the opening of the contact portion.

(Fifth embodiment)
A fifth embodiment will be described. In the present embodiment, the configurations of the movable contact 20 and the magnetic collecting yoke 24 are changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment, and therefore different from the first embodiment. Only will be described.

  As shown in FIG. 11, in this embodiment, the magnetism collection yoke 24 is comprised by one member. Specifically, the other ends of the first yoke 241 and the second yoke 242 are connected by a connecting portion 243. The connecting portion 243 is configured to extend in the normal direction of the surface of the south pole of the first magnet 231 and the second magnet 232. In addition, the movable contact 20 has a single cutout portion 20a so that the connecting portion 243 can enter, and the movable contactor 20 and the connecting portion 243 face each other at the bottom of the cutout portion 20a.

  According to such a configuration, since the magnetism collecting yoke 24 can be formed as one member, the number of parts can be reduced. Further, as shown in FIG. 11, since the leakage magnetic flux generated in the connecting portion 243 and the mover current flowing in the movable contact 20 are linked, the movable contact 20 is compared with the above embodiments. It is possible to generate a downward Lorentz force also in the central portion. Therefore, it is possible to further suppress the opening of the contact portion.

(Modification of the fifth embodiment)
In the fifth embodiment, the case where the magnetism collecting yoke 24 is formed of one member has been described. However, as shown in FIG. 12, the connecting portion 243 and the connecting portion 243 are disposed on the opposite side of the movable contact 20. A magnetism collecting yoke 244 may be provided so as to face each other. This magnetism collecting yoke 244 is a counter yoke and is formed of a rectangular plate-like soft magnetic material, and is linear when viewed from above the electromagnetic relay as shown in FIG. By providing such a magnetic flux collecting yoke 244, it is possible to increase the amount of magnetic flux from the connecting portion 243 toward the magnetic flux collecting yoke 244, that is, to increase the amount of magnetic flux interlinked with the movable contact 20. Accordingly, the downward Lorentz force at the central portion of the movable contact 20 can be increased, and further the opening of the contact portion can be suppressed.

(Sixth embodiment)
A sixth embodiment will be described. This embodiment is different from the first embodiment in that the configuration of the arc extinguishing magnet 23 and the magnetism collecting yoke 24 is changed with respect to the first embodiment, and the others are the same as the first embodiment. Only the part will be described.

  In the present embodiment, as shown in FIG. 13, only one arc extinguishing magnet 23 is provided, and it is disposed to face the central portion of the movable contact 20. Here, the arc extinguishing magnet 23 is arranged so that the N pole is directed to the central portion of the movable contact 20 and the S pole is directed to the opposite side of the central portion of the movable contact 20.

  The magnetism collecting yoke 24 is disposed on the opposite side of the movable contact 20 with the first yoke 245 disposed between the arc extinguishing magnet 23 and the movable contact 20 and the arc extinguishing magnet 23 interposed therebetween. The second yoke 246 is configured.

  The first yoke 245 is composed of a U-shaped member whose one end and the other end enter one and the other of the two notches 20a, respectively.

  The second yoke 246 is also composed of a U-shaped member, is disposed around the first yoke 245, and is larger than the first yoke 245. Specifically, the second yoke 246 is arranged so that one end faces the one end of the first yoke 245 across the contact portion between the first fixed contact 27 and the first movable contact 29, and the other end is the second. The fixed contact 28 and the second movable contact 30 are disposed so as to face the other end of the second yoke 246 across the contact portion.

  In such a configuration, each contact portion is disposed so as to be sandwiched between the first yoke 245 and the second yoke 246, so that each end portion of the first yoke 245 extends to each end portion of the second yoke 246. Magnetic flux can be generated. That is, the arc extinguishing magnet 23 can be made one while the magnetic flux at each contact portion is the same as that in each of the above embodiments. Thus, since the number of arc extinguishing magnets 23 can be reduced, the size of the physique near the contact portion can be greatly reduced.

(Modification of the sixth embodiment)
In the sixth embodiment, as shown in FIG. 14, the second yoke 246 is located on the side farther from the movable contact 20 than the bent portion 25 a of the first fixed terminal 25 or the bent portion 26 a of the second fixed terminal 26. A detour structure can be used. In this way, the direction of the magnetic flux of the arc extinguishing magnet 23 flowing in the second yoke 246 and the direction of the magnetic flux of the stator current flowing in the first fixed terminal 25 and the second fixed terminal 26 can be matched. Therefore, the interlinkage magnetic flux to the movable contact 20 can be increased more than in the sixth embodiment, and the downward Lorentz force and the arc interruption performance can be improved.

(Seventh embodiment)
A seventh embodiment will be described. In the present embodiment, the first fixed terminal 25 and the second fixed terminal 26 are pulled out in opposite directions with respect to the first to fourth embodiments. Therefore, only different portions from the first to fourth embodiments will be described. In addition, although the case where it is set as the structure of this embodiment with respect to 1st Embodiment is demonstrated here, it is applicable also to 2nd-4th embodiment.

  As shown in FIG. 15, the first fixed terminal 25 is drawn upward in the drawing, and the second fixed terminal 26 is drawn down in the drawing.

  The movable contact 20 has a rectangular shape, and is provided with a notch 20c on one side and a notch 20d on one side opposite to the one side. The notch 20c and the notch 20d are arranged symmetrically with respect to the center of the movable contact 20, and the movable contact 20 has a rotationally symmetric shape.

  The first yoke 241 is configured by a U-shaped plate-like member, and is disposed around the first fixed contact 27 and the first magnet 231. One end is disposed opposite to the north pole of the first magnet 231 and the other end is disposed opposite to the south pole of the first magnet 231 via the first fixed contact 27 and enters the cutout portion 20c. The second yoke 242 is formed of a U-shaped plate-like member, and is disposed around the second fixed contact 28 and the second magnet 232. One end is disposed opposite to the north pole of the second magnet 232, and the other end is disposed opposite to the south pole of the second magnet 232 via the second fixed contact 28, and enters the notch 20d.

  Even with such a configuration, the magnetic flux guided by the magnetic collecting yoke 24 can be effectively linked to the mover current flowing in the movable contact 20, and a downward Lorentz force can be generated. Therefore, the same effect as that of the first embodiment can be obtained.

(Eighth embodiment)
An eighth embodiment will be described. This embodiment has three contact points with respect to the first to seventh embodiments, and is otherwise the same as the first to seventh embodiments. Only the different parts will be described. In addition, although the case where it is set as the structure of this embodiment with respect to 1st Embodiment is demonstrated here, it is applicable also to 2nd-7th Embodiment.

  As shown in FIG. 16, the electromagnetic relay according to the present embodiment includes a third fixed contact 31 in addition to the first fixed contact 27 and the second fixed contact 28, and further includes a first movable contact 29 and a second movable contact 30. In addition, the third movable contact 32 is provided. The third movable contact 32 and the second movable contact 30 are arranged in an extended portion of the movable contactor 20 located outside the notch 20a, and are aligned with the second movable contact 30 in the extending direction of the extended portion. Has been placed.

  The third fixed contact 31 is disposed below the second fixed contact 28 in FIG. 16, that is, below the straight line connecting the first fixed contact 27 and the second fixed contact 28. Similarly, the third movable contact 32 is disposed below the second movable contact 30 in FIG. 16, that is, below the straight line connecting the first movable contact 29 and the second movable contact 30. . Thereby, the contact portion between the first fixed contact 27 and the first movable contact 29, the contact portion between the second fixed contact 28 and the second movable contact 30, the third fixed contact 31 and the third movable contact 32 are provided. The contact point has a three-point contact part.

  Thus, if it is set as the structure which has the contact part of 3 points | pieces, in addition to the effect similar to 1st Embodiment being obtained, it becomes possible to suppress the rocking | fluctuation of the movable contactor 20. FIG. Further, the current flows from the movable contact 20 to the second fixed terminal 26 through the contact portion between the third fixed contact 31 and the third movable contact 32. For this reason, between the contact portion between the second fixed contact 28 and the second movable contact 30 from the contact portion between the third fixed contact 31 and the third movable contact 32, the movable contact 20 and the second fixed terminal 26 are connected. A current in the same direction flows in both. For this reason, it is possible to generate an attractive force due to the current flowing between them, and it is possible to further suppress the opening of the contact portion.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope described in the claims.

  (1) For example, in the said embodiment, the 1st fixed terminal 25 was equipped with the 1st fixed contact 27 of another member, and the 2nd fixed terminal 26 was equipped with the 2nd fixed contact 28 of another member. However, a protrusion that protrudes toward the movable contact 20 may be formed on the first fixed terminal 25 and the second fixed terminal 26, for example, by pressing, and the protrusion may be used as a fixed contact. The same applies to the third fixed contact 31 described in the eighth embodiment.

  (2) Similarly, in the above embodiment, the first movable contact 29 and the second movable contact 30, which are separate members, are caulked and fixed to the movable contact 20. However, the movable contact 20 may be formed with a protrusion that protrudes toward the first fixed terminal 25 and the second fixed terminal 26 by, for example, pressing, and the protrusion may be used as a movable contact. The same applies to the third movable contact 32 described in the eighth embodiment.

  (3) The shape of the movable contact 20, the first fixed terminal 25, and the second fixed terminal 26 is merely an example.

DESCRIPTION OF SYMBOLS 12 Excitation coil 13 Fixed core 15 Movable core 22 Movable contactor 23 Arc-extinguishing magnet 24 Magnetic collecting yoke 24, 25 1st, 2nd fixed terminal 26, 27, 31 1st-3rd fixed contact 28, 29, 32 1st 1st to 3rd movable contact

Claims (11)

An exciting coil (12) that forms a magnetic field when energized;
A movable contact (20) having a movable contact (29, 30) and being moved based on energization of the exciting coil;
Fixed terminals (25, 26) having fixed contacts (27, 29) in contact with the movable contacts when the movable contact is moved during energization of the exciting coil;
An arc extinguishing magnet (23, 23) for extinguishing an arc generated at the contact portion when switching from an on state in which the movable contact and the fixed contact abut to an off state in which the movable contact and the fixed contact are separated. 231, 232),
One end of the arc-extinguishing magnet disposed opposite to one magnetic pole and the other end from which the magnetic flux from the arc-extinguishing magnet is guided, the other end being a contact between the movable contact and the fixed contact A magnetism collecting yoke (24, 241, 242) disposed opposite to the other magnetic pole of the arc-extinguishing magnet via a portion,
When in the on state, a current is passed through the movable contact through the movable contact through the contact portion between the movable contact and the fixed contact.
An electromagnetic relay that generates a Lorentz force in a direction in which the movable contact and the fixed contact are in contact with each other by a current flowing through the movable contact and a magnetic flux guided by the magnetic collecting yoke.   2. The electromagnetic relay according to claim 1, wherein the movable contact includes an extending portion that causes a current to flow through the movable contact in a direction crossing a magnetic flux guided by the magnetic collecting yoke.   Of the fixed terminal, the portion where the fixed contact is arranged has the direction of the magnetic flux generated when a current flows through the portion and the direction of the magnetic flux from the other end of the magnetism collecting yoke toward the arc-extinguishing magnet. The electromagnetic relay according to claim 1 or 2, wherein the electromagnetic relay extends in a uniform direction. An exciting coil (12) that forms a magnetic field when energized;
A movable contact (20) having a first movable contact (29) and a second movable contact (30) and being moved based on energization of the exciting coil;
When the movable contact is moved during energization of the excitation coil, the movable contact is brought into contact with the first fixed terminal (25) having the first fixed contact (27) in contact with the first movable contact and the second movable contact. A second fixed terminal (26) having a second fixed contact (28);
The first movable contact and the first fixed contact are separated from the ON state in which the first movable contact and the first fixed contact are in contact with each other and the second movable contact and the second fixed contact are in contact with each other. Arc extinguishing having a first magnet (231) and a second magnet (232) for extinguishing the arc generated at the contact portion when the second movable contact and the second fixed contact are switched to the off state. Magnet (23),
One end of the first magnet disposed opposite to one magnetic pole and the other end from which the magnetic flux from the first magnet is guided, the other end being the first movable contact and the first fixed contact The first yoke (241) disposed opposite to the other magnetic pole of the first magnet via the contact portion of the first magnet, one end disposed opposite to the one magnetic pole of the second magnet, and the one end from the one end A second yoke disposed opposite to the other magnetic pole of the second magnet via a contact portion between the second movable contact and the second fixed contact. 242), and a magnetism collecting yoke (24) having
In the ON state, the first fixed contact is made through the movable contact through the contact portion between the first movable contact and the first fixed contact and the contact portion between the second movable contact and the second fixed contact. A current is passed between the terminal and the second fixed terminal;
The first movable contact and the first fixed contact come into contact with each other and the second movable contact and the second fixed contact are in contact with each other by the current flowing through the movable contact and the magnetic flux guided by the magnetic collecting yoke. An electromagnetic relay that generates Lorentz force in the direction of contact.   The movable contact extends an electric current flowing through the first movable contact and an electric current flowing through the second movable contact in a direction crossing the magnetic flux guided by the magnetic collecting yoke. The electromagnetic relay of Claim 4 provided with the part. The movable contact has a third movable contact (32) in addition to the first movable contact and the second movable contact,
The second fixed terminal has a third fixed contact (31) to be brought into contact with the third movable contact in addition to the second fixed contact,
The electromagnetic relay according to claim 5, wherein the second movable contact and the third movable contact are arranged side by side in the extending direction of the extending portion. Of the first fixed terminal, the portion where the first fixed contact is disposed has a direction of a magnetic flux generated when a current flows through the portion and a direction of the magnetic flux from the other end of the first yoke toward the first magnet. It extends in the direction where the direction is aligned,
Of the second fixed terminal, the portion where the second fixed contact is disposed has a direction of a magnetic flux generated when a current flows through the portion and a direction of the magnetic flux from the other end of the second yoke toward the second magnet. The electromagnetic relay according to any one of claims 4 to 6, wherein the electromagnetic relay extends in a direction in which the directions are aligned.   The movable contact has a rectangular shape, and a first notch including a notch into which the other end of the first yoke enters and a notch into which the other end of the second yoke enters on one side in the longitudinal direction of the movable contact. The electromagnetic relay according to any one of claims 4 to 7, wherein a portion (20a) is formed.   The electromagnetic relay according to claim 8, wherein the movable contact has a second notch (20 b) formed at a central position on one side opposite to the one side on which the first notch is formed. The first fixed terminal has a bent portion (25a) bent toward the movable contact side, and the first yoke has the first fixed contact more than the bent portion of the first fixed terminal. Is located around the location away from
The second fixed terminal has a bent portion (26a) bent toward the movable contact, and the second yoke has the second fixed contact more than the bent portion of the second fixed terminal. The electromagnetic relay as described in any one of Claim 4 thru | or 9 arrange | positioned by detouring the position away from.   The other end of the first yoke and the other end of the second yoke are connected by a connecting portion (243) made of a soft magnetic material, so that the first yoke and the second yoke are integrated. The electromagnetic relay according to any one of claims 4 to 10.

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