JP7056549B2 - Electromagnetic relay - Google Patents

Description

The present invention relates to an electromagnetic relay.

Conventionally, an electromagnetic relay that opens and closes an electric circuit is known. For example, the electromagnetic relay of Patent Document 1 includes a fixed terminal including a fixed contact and a movable contact piece including a movable contact. The movable contact can come into contact with the fixed contact, and the electric circuit is opened and closed when the movable contact comes into contact with the fixed contact or is separated from the fixed contact. Further, the electromagnetic relay is provided with a permanent magnet for extending an arc generated when the movable contact is separated from the fixed contact (see Patent Document 1). As a result, Lorentz force acts on the arc to extend the arc.

In the electromagnetic relay of Patent Document 1, the fixed terminal and the movable contact piece are configured to have substantially the same length in the extension direction of the arc. Therefore, when the arc is extended by the Lorentz force, the arc is extended substantially evenly in the vertical direction.

Japanese Patent No. 6281301

In electromagnetic relays, there are cases where it is desired to greatly extend the arc in one direction in order to make effective use of space or the like due to design reasons. However, in the electromagnetic relay of Patent Document 1, since the arc is extended substantially evenly in the vertical direction, it is difficult to extend the arc significantly downward rather than upward, for example.

An object of the present invention is to make it easy to control the extension direction of an arc in an electromagnetic relay.

The electromagnetic relay according to one aspect of the present invention includes a pair of fixed terminals, a movable contact piece, and a magnet portion. A pair of fixed terminals includes fixed contacts. The movable contact piece includes a movable contact arranged so as to face the fixed contact. The movable contact piece can move in the first direction in which the movable contact contacts the fixed contact and in the second direction in which the movable contact opens from the fixed contact. The magnet portion generates a magnetic field for extending the arc generated between the fixed contact and the movable contact. Either one of the pair of fixed terminals or the movable contact piece includes an extension portion extending in the extending direction of the arc and passing through the arc more than any one of the pair of fixed terminals or the movable contact piece.

In this electromagnetic relay, for example, when a pair of fixed terminals includes a stretched portion, the stretched portion extends in the arc extending direction from the movable contact piece, so that the arc extending direction of the pair of fixed terminals is extended from the fixed contact. The distance to the end located at is larger than the distance from the movable contact to the end located in the extension direction of the arc of the movable contact piece. Therefore, the end of the arc on the fixed contact side moves in the extension direction of the arc more than the end of the arc on the movable contact side. As a result, the direction of the Lorentz force acting on the arc changes, so that the arc can be greatly extended in one direction, and the extension direction of the arc can be easily controlled. Further, the same effect can be obtained even when the movable contact piece includes a stretched portion.

Preferably, the extension direction is parallel to the lateral direction of the movable contact piece. In this case, the arc can be greatly extended in either the first direction or the second direction.

Preferably, the electromagnetic relay is extended in a second direction from the movable contact piece and further comprises an arc extension space for extending the arc. The pair of fixed terminals include the stretched portion. In this case, since the arc can be extended in the second direction more than in the first direction, the arc can be greatly extended toward the arc extension space expanded in the second direction.

Preferably, the corners of the movable contact piece in the extension direction have a chamfered shape. In this case, the arc can be smoothly moved to the surface opposite to the contact side.

Preferably, the electromagnetic relay further comprises an arc horn extending from the movable contact piece in a second direction and connected to the movable contact piece on the extension direction side of the movable contact piece. In this case, the arc can be further extended toward the arc extension space.

Preferably, the arc horn is arranged so as to be inclined toward the center of the movable contact piece in the lateral direction. In this case, the arc can be further extended toward the arc extension space.

Preferably, the electromagnetic relay is extended in a first direction from a pair of fixed terminals and further comprises an arc extension space for extending the arc. The movable contact piece includes a stretched portion. In this case, since the arc can be extended in the first direction more than in the second direction, the arc can be greatly extended toward the arc extension space expanded in the first direction.

Preferably, the corners of the pair of fixed terminals in the extension direction have a chamfered shape. In this case, the arc can be smoothly moved to the surface opposite to the contact side.

Preferably, the electromagnetic relay further comprises an arc horn extending from the pair of fixed terminals in a first direction and connected to the pair of fixed terminals on the extension direction side of the pair of fixed terminals. In this case, the arc can be further extended toward the arc extension space.

Preferably, the arc horn is arranged so as to be inclined toward the center of the pair of fixed terminals in the lateral direction of the movable contact piece. In this case, the arc can be further extended toward the arc extension space.

Preferably, the pair of fixed terminals are plate-shaped terminals extending in the longitudinal direction of the movable contact piece. In this case, in an electromagnetic relay using a plate-shaped fixed terminal, it becomes possible to easily control the extension direction of the arc.

According to the present invention, in a magnetic relay, it becomes possible to easily control the extension direction of the arc.

It is sectional drawing of the electromagnetic relay. It is a schematic diagram which looked at the inside of the accommodation part from above. It is sectional drawing which looked at the cross section around the 1st fixed contact in the direction from the 1st magnet to the 2nd magnet. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is a figure corresponding to FIG. 3 which concerns on another embodiment. It is sectional drawing of the 1st fixed terminal which concerns on other embodiment.

Hereinafter, embodiments of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an electromagnetic relay 100. As shown in FIG. 1, the electromagnetic relay 100 includes a housing 2, a contact device 3, a drive shaft 4, an electromagnetic drive device 5, and a magnet portion 6.

When referring to the drawings, the upper side in FIG. 1 will be referred to as “upper”, the lower side will be referred to as “lower”, the left side will be referred to as “left”, and the right side will be referred to as “right” in order to make the explanation easier to understand. Further, the direction orthogonal to the paper surface of FIG. 1 will be described as the front-back direction. In this embodiment, the upper part in FIG. 1 is the contact direction Z1. Further, the lower part in FIG. 1 is the separation direction Z2. Details of the contact direction Z1 and the separation direction Z2 will be described later.

The housing 2 has a substantially quadrangular box shape and is made of an insulating material. A contact device 3, a drive shaft 4, an electromagnetic drive device 5, and a magnet portion 6 are housed inside the housing 2.

The housing 2 includes the accommodating portion 11. The accommodating portion 11 is composed of, for example, a substantially rectangular parallelepiped case member arranged in the housing 2. The accommodating portion 11 is made of an insulating material.

FIG. 2 is a schematic view of the inside of the accommodating portion 11 as viewed from above. The accommodating portion 11 includes a first inner wall surface 11a, a second inner wall surface 11b, a third inner wall surface 11c, and a fourth inner wall surface 11d. Each of the first to fourth inner wall surfaces 11a to 11d is the front, rear, left and right inner surfaces of the accommodating portion 11. The first inner wall surface 11a and the second inner wall surface 11b extend in the vertical direction and the horizontal direction. The first inner wall surface 11a and the second inner wall surface 11b are arranged so as to face each other in the front-rear direction. The third inner wall surface 11c and the fourth inner wall surface 11d extend in the vertical direction and the front-rear direction. The third inner wall surface 11c and the fourth inner wall surface 11d are arranged so as to face each other in the left-right direction. The left-right dimensions of the first inner wall surface 11a and the second inner wall surface 11b are longer than the vertical dimensions of the third inner wall surface 11c and the fourth inner wall surface 11d.

The accommodating portion 11 includes an accommodating space 12 accommodating the contact device 3. In the present embodiment, the accommodation space 12 is composed of a space having a substantially rectangular parallelepiped shape that is shielded from the outside. The sides of the accommodation space 12 are surrounded by the first to fourth inner wall surfaces 11a to 11d.

The contact device 3 includes a first fixed terminal 14, a second fixed terminal 15, a movable contact piece 16, and a contact piece holding portion 17. The first fixed terminal 14, the second fixed terminal 15, and the movable contact piece 16 are made of a conductive material.

The first fixed terminal 14 and the second fixed terminal 15 are plate-shaped terminals and extend in the left-right direction. The first fixed terminal 14 and the second fixed terminal 15 are arranged so as to be spaced apart from each other in the left-right direction. The first fixed terminal 14 and the second fixed terminal 15 are examples of a pair of fixed terminals.

The first fixed terminal 14 includes a first fixed contact 14a and a first external connection portion 14b. The first fixed contact 14a is arranged in the accommodation space 12. The first external connection portion 14b projects to the left from the housing 2 and is exposed to the outside. The second fixed terminal 15 includes a second fixed contact 15a and a second external connection portion 15b. The second fixed contact 15a is arranged in the accommodation space 12. The second external connection portion 15b projects to the right from the housing 2 and is exposed to the outside.

As shown in FIGS. 1 and 2, the movable contact piece 16 is a plate-shaped member that is long in one direction and extends in the left-right direction in the accommodation space 12. The movable contact piece 16 is arranged in the accommodation space 12 with a space in the front-rear direction from the first inner wall surface 11a and the second inner wall surface 11b. Arc extension spaces 12a and 12b for extending an arc are provided between the movable contact piece 16 and the first inner wall surface 11a, and between the movable contact piece 16 and the second inner wall surface 11b. The arc extension spaces 12a and 12b are arranged at positions close to the first fixed contact 14a and the first movable contact 16a described later, or the second fixed contact 15a and the second movable contact 16b described later. The arc extension spaces 12a and 12b are extended to the opening direction Z2 side of the movable contact piece 16 from the contact direction Z1 side of the movable contact piece 16.

The movable contact piece 16 is arranged in the accommodation space 12 at a distance in the left-right direction from the third inner wall surface 11c and the fourth inner wall surface 11d. The movable contact piece 16 is arranged below the first fixed terminal 14 and the second fixed terminal 15. In the present embodiment, the longitudinal direction of the movable contact piece 16 coincides with the left-right direction. Further, the lateral direction of the movable contact piece 16 coincides with the front-rear direction.

The movable contact piece 16 includes a first movable contact 16a and a second movable contact 16b. The first movable contact 16a is arranged to face the first fixed contact 14a and is in contact with the first fixed contact 14a. The second movable contact 16b is arranged at a distance from the first movable contact 16a in the left-right direction. The second movable contact 16b is arranged to face the second fixed contact 15a and is in contact with the second fixed contact 15a.

The movable contact piece 16 is movable in the contact direction Z1 in contact with the first fixed contact 14a and the second fixed contact 15a, and in the opening direction Z2 separated from the first fixed contact 14a and the second fixed contact 15a. The contact direction Z1 is an example of the first direction, and the separation direction Z2 is an example of the second direction.

The contact direction Z1 is the direction in which the first movable contact 16a and the second movable contact 16b come into contact with the first fixed contact 14a and the second fixed contact 15a (upper in FIG. 1). The opening direction Z2 is the direction in which the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14a and the second fixed contact 15a (lower side in FIG. 1).

As shown in FIG. 1, the contact piece holding portion 17 holds the movable contact piece 16 via the drive shaft 4. The contact piece holding portion 17 connects the movable contact piece 16 and the drive shaft 4. The contact piece holding portion 17 includes a holder 24 and a contact spring 25. The contact spring 25 urges the drive shaft 4 and the movable contact piece 16 toward the contact direction Z1.

The drive shaft 4 extends along the contact direction Z1 and the separation direction Z2. The drive shaft 4 can move in the contact direction Z1 and the separation direction Z2 together with the movable contact piece 16.

The electromagnetic drive device 5 drives the contact device 3. The electromagnetic drive device 5 moves the movable contact piece 16 together with the drive shaft 4 in the contact direction Z1 and the opening direction Z2 by an electromagnetic force. The electromagnetic drive device 5 is arranged below the accommodating portion 11 in the housing 2.

The electromagnetic drive device 5 includes a movable iron core 31, a fixed iron core 32, and a yoke 33. Further, the electromagnetic drive device 5 includes a coil, a spool, and a coil spring (not shown). Since the electromagnetic drive device 5 has the same configuration as the conventional one, detailed description thereof will be omitted.

The magnet portion 6 has a magnetic field in the accommodating portion 11 for extending an arc generated between the first fixed contact 14a and the first movable contact 16a and between the second fixed contact 15a and the second movable contact 16b. generate. Specifically, as shown in FIG. 1, the magnet portion 6 includes a first magnet 6a and a second magnet 6b. The first magnet 6a and the second magnet 6b are permanent magnets, and the first magnet 6a and the second magnet 6b are permanent magnets.

The first magnet 6a and the second magnet 6b extend in the front-rear direction and the up-down direction. The first magnet 6a and the second magnet 6b are fixed to the outer periphery of the accommodating portion 11 in this embodiment. The first magnet 6a and the second magnet 6b are arranged around the accommodating portion 11 so that different poles face each other in the longitudinal direction of the movable contact piece 16. The north pole of the first magnet 6a is arranged so as to face the accommodating portion 11. The second magnet 6b has an S pole facing the accommodating portion 11. Due to the first magnet 6a and the second magnet 6b arranged in this way, a magnetic flux flows in the accommodating portion 11 in a direction substantially parallel to the lateral direction of the movable contact piece 16.

Next, the operation of the electromagnetic relay 100 will be described. Since the operation of the electromagnetic relay 100 is the same as that of the conventional one, it will be briefly described.

FIG. 1 shows a state in which a voltage is applied to the coil. When a voltage is applied to the coil, the movable iron core 31 moves in the contact direction Z1 against the elastic force of the coil spring. With the movement of the contact direction Z1 of the movable iron core 31, the drive shaft 4 and the movable contact piece 16 move in the contact direction Z1, and the first movable contact 16a and the second movable contact 16b become the first fixed contact 14a and the second. Contact the fixed contact 15a. When the application of the voltage to the coil is stopped, the movable iron core 31 moves in the opening direction Z2 together with the movable contact piece 16 due to the elastic force of the coil spring. As a result, the first movable contact 16a and the second movable contact 16b are in a state of being separated from the first fixed contact 14a and the second fixed contact 15a. When the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14a and the second fixed contact 15a, the first movable contact 16a and the first fixed contact 14a and the second An arc is generated between the movable contact 16b and the second fixed contact 15a.

Here, as shown in FIG. 2, for example, when a current flows from the first fixed contact 14a to the first movable contact 16a, the arc generated between the first fixed contact 14a and the first movable contact 16a is the first. 2 The Lorentz force F1 acts in the direction toward the inner wall surface 11b. As a result, the arc is extended in the arc extension space 12a. Further, the Lorentz force F2 acts on the arc generated between the second fixed contact 15a and the second movable contact 16b in the direction toward the first inner wall surface 11a. As a result, the arc is extended in the arc extension space 12b. When the current flows from the first movable contact 16a toward the first fixed contact 14a, the directions of the Lorentz force F1 and the Lorentz force F2 acting on the arc are opposite to the above-mentioned directions, respectively. In the present embodiment, unless otherwise specified, the direction in which the current flows is described as the direction and direction from the first fixed contact 14a to the first movable contact 16a.

FIG. 3 is a schematic cross-sectional view of the periphery of the first fixed contact 14a as viewed in the direction from the first magnet 6a to the second magnet 6b. FIG. 3 schematically shows how the arc is extended by the Lorentz force F1 acting on the arc.

As shown in FIG. 3, the first fixed terminal 14 includes a first surface 20a, a second surface 20b, a third surface 20c, and a fourth surface 20d. The first surface 20a is the surface of the first fixed terminal 14 on the Z2 side in the opening direction. The second surface 20b is a surface opposite to the first surface 20a, and is a surface of the first fixed terminal 14 on the contact direction Z1 side. The first surface 20a and the second surface 20b extend in the front-rear direction and the left-right direction. In the present embodiment, the first surface 20a and the second surface 20b have a flat shape. The third surface 20c is the rear surface of the first fixed terminal 14. The fourth surface 20d is the surface opposite to the third surface 20c, and is the front surface of the first fixed terminal 14. The third surface 20c and the fourth surface 20d extend in the vertical direction and the horizontal direction.

The movable contact piece 16 includes a first surface 30a, a second surface 30b, a third surface 30c, and a fourth surface 30d. The first surface 30a is the surface of the movable contact piece 16 on the contact direction Z1 side, and faces the first surface 20a of the first fixed terminal 14. The second surface 3b is a surface opposite to the first surface 30a, and is a surface of the movable contact piece 16 on the Z2 side in the opening direction. The first surface 30a and the second surface 30b extend in the front-rear direction and the left-right direction. In the present embodiment, the first surface 30a and the second surface 30b have a flat shape. The third surface 30c is the rear surface of the movable contact piece 16. The fourth surface 20d is the surface opposite to the third surface 30c, and is the front surface of the movable contact piece 16. The third surface 30c and the fourth surface 30d extend in the vertical direction and the horizontal direction.

The first fixed terminal 14 extends longer than the movable contact piece 16 in the front-rear direction. In other words, the dimension of the first fixed terminal 14 in the lateral direction of the movable contact piece 16 is larger than the dimension of the movable contact piece 16 in the lateral direction. Further, both ends of the first fixed terminal 14 in the lateral direction are located outside the movable contact piece 16 in the lateral direction. The first surface 20a of the first fixed terminal 14 extends in the front-rear direction from the first surface 30a of the movable contact piece 16. Both ends of the first surface 20a of the first fixed terminal 14 are located outside in the lateral direction from both ends of the first surface 30a of the movable contact piece 16. The third surface 20c of the first fixed contact 14a is located behind the third surface 30c of the movable contact piece 16. The fourth surface 20d of the first fixed terminal 14 is located in front of the fourth surface 30d of the movable contact piece 16.

The first fixed terminal 14 further includes a stretched portion 21. In the present embodiment, the stretched portion 21 is composed of a part of the first surface 20a, and is arranged at least in a portion through which an arc passes. For example, the stretching portion 21 may be arranged only in a range close to the first fixed contact 14a of the first fixed terminal 14 located in the extending direction of the arc. In the present embodiment, the extending portion 21 extends in the extending direction of the arc over the entire length of the first fixed terminal 14.

The stretched portion 21 is arranged on the rear end side of the first fixed terminal 14. The stretched portion 21 extends in the extending direction of the arc more than the movable contact piece 16. The stretched portion 21 extends rearward from the first surface 30a of the movable contact piece 16. Therefore, the distance from the center of the first fixed contact 14a to the rear end (third surface 20c) of the extended portion 21 is from the center of the first movable contact 16a to the rear end (third surface 30c) of the first surface 30a. Longer than the distance.

The extension direction of the arc in the present embodiment means the same direction as the Lorentz force acting on the arc. However, in the present embodiment, the direction of the Lorentz force acting on the arc changes with the movement of the arc. Therefore, more accurately, the extension direction of the arc means the direction of the Lorentz force acting on the arc at the time when it is generated between the first movable contact 16a and the first fixed contact 14a. In this embodiment, the extension direction of the arc is parallel to the lateral direction of the movable contact piece 16.

As shown in FIGS. 2 and 3, when the Lorentz force F1 acts on the arc generated between the first fixed contact 14a and the first movable contact 16a, the first end A1 of the arc and the second end A2 of the arc become the second. 2 The arc moves in the direction toward the inner wall surface 11b, and the arc is extended in the arc extension space 12a.

As shown in FIG. 3, the first end A1 of the arc and the second end A2 of the arc move in the vertical direction until the second end A2 of the arc moves from the first movable contact 16a to the rear end portion of the first surface 30a. Move at approximately the same speed so that it overlaps with. After that, the second end A2 of the arc moves to the third surface 30c. On the other hand, the first end A1 of the arc moves further rearward through the extending portion 21. Therefore, as shown in FIG. 3, when the first end A1 of the arc moves to the rear end of the stretched portion 21, the first end A1 of the arc and the second end A2 of the arc are displaced in the vertical direction. The direction of the Lorentz force F1 that is generated and acts on the arc changes backward and in the direction toward the separation direction Z2. As a result, the arc can be extended downward more than above, so that the extension direction of the arc can be easily controlled. Here, the arc can be efficiently extended in the arc extension space 12a, and the arc can be quickly extinguished.

The second fixed terminal 15 has a symmetrical shape with the first fixed terminal 14 with the drive shaft 4 interposed therebetween, and the movable contact piece 16 has a symmetrical shape with the drive shaft 4 interposed therebetween. Therefore, even in the arc generated between the second fixed contact 15a and the second movable contact 16b, the same effect as described above can be obtained when the arc is extended by the Lorentz force F2.

Although the embodiment of the electromagnetic relay according to one aspect of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention. For example, the shape or arrangement of the housing 2, the contact device 3, the drive shaft 4, the electromagnetic drive device 5, or the accommodating portion 11 may be changed.

For example, the first fixed terminal 14 and the second fixed terminal 15 may be bent in a substantially L shape in the housing 2. Further, the first fixed terminal 14 and the second fixed terminal 15 are arranged below the movable contact piece 16, and the movable contact piece 16 is pulled toward the first fixed terminal 14 and the second fixed terminal 15 by the electromagnetic drive device 5. It may be operated as follows. Further, the first fixed terminal 14 and the second fixed terminal 15 may be cylindrical terminals. In this case, for example, the dimension of the movable contact piece 16 in the lateral direction may be smaller than the diameter of the first fixed terminal 14.

Further, in the above embodiment, the first fixed terminal 14 is configured to include the stretched portion 21, but as shown in FIG. 4, the movable contact piece 16 may include the stretched portion 21. For example, the dimension of the movable contact piece 16 in the lateral direction may be larger than the dimension of the first fixed terminal 14 in the lateral direction of the movable contact piece 16. In this case, it is preferable that the arc extension spaces 12a and 12b are expanded from the first fixed terminal 14 in the contact direction Z1.

As shown in FIG. 5, the electromagnetic relay 100 may further include an arc horn 40. In FIG. 5, the arc horn 40 extends from the third surface 30c and the fourth surface 30d of the movable contact piece 16 in the opening direction Z2, and is connected to both ends of the movable contact piece 16 in the lateral direction. In this case, the arc can be extended further downward, and the extension direction of the arc can be easily controlled. Further, as shown in FIG. 6, the arc horn 40 may be arranged so as to be inclined toward the center in the lateral direction of the movable contact piece 16 on the second surface side 30b of the movable contact piece 16. In this case, the arc can be extended further downward. As shown in FIG. 7, when the movable contact piece 16 includes the extending portion 21, the arc horn 40 extends from the first fixed terminal 14 toward the contact direction Z1 and the arc extending direction of the first fixed terminal 14. It is connected to the first fixed terminal 14 on the side. Further, as shown in FIG. 8, the arc horn 40 may be tilted on the second surface 20b side of the first fixed terminal 14 in a direction approaching the center of the first fixed terminal 14 in the lateral direction of the movable contact piece 16. ..

As shown in FIG. 9, the corner portions C1 to C4 of the movable contact piece 16 may have a chamfered shape. In particular, here, by chamfering the corner portions C1 and C2 located in the extension direction of the arc, the second end A2 of the arc can smoothly move from the first surface 30a to the second surface 30b. As a result, the arc can be rapidly and greatly extended downward. The chamfered shape is, for example, a C chamfered shape or an R chamfered shape. As shown in FIG. 10, when the movable contact piece 16 includes the stretched portion 21, the corner portions C5 to C8 of the first fixed terminal 14 may have a chamfered shape.

As shown in FIG. 11, the dimension of the first fixed contact 14a in the lateral direction of the movable contact piece 16 may be larger than the dimension of the first movable contact 16a in the lateral direction of the movable contact piece 16.

Further, when the electromagnetic relay 100 has polarity and the extension direction of the arc is changed depending on the polarity, the positions of the first fixed terminal 14 and the movable contact piece 16 are arranged so as to be offset from each other in the lateral direction of the movable contact piece 16. You may. For example, as shown in FIG. 12, even if the first surface 30a of the movable contact piece 16 is extended forward from the first surface 20a of the first fixed terminal 14, the stretched portion 22 corresponding to the stretched portion 21 is formed. good. Further, in this case, it is preferable that the corner portions C1 to C4 of the first fixed terminal 14 and the corner portions C5 to C8 of the movable contact piece 16 have a chamfered shape.

As shown in FIG. 13A, the first fixed contact 14a may be arranged so as to be flush with the first surface 20a. Alternatively, as shown in FIG. 13B, the first fixed contact 14a may be integrated with the first fixed terminal 14. In this case, the first surface 20a of the first fixed terminal 14 comes into contact with the first movable contact 16a or the movable contact piece 16. The configuration may be applied to the first fixed terminal 14 or the movable contact piece 16.

According to the present invention, in a magnetic relay, it becomes possible to easily control the extension direction of the arc.

6 Magnet part 12a Arc extension space 12b Arc extension space 14 First fixed terminal 14a First fixed contact (an example of fixed contact)
15 Second fixed terminal 15a Second fixed contact (an example of fixed contact)
16 Movable contact piece 16a First movable contact (an example of movable contact)
16b Second movable contact (an example of movable contact)
21 Stretched part 22 Stretched part 40 Arc horn 100 Electromagnetic relay

Claims (10)

A pair of fixed terminals including fixed contacts,
Movable including a movable contact arranged facing the fixed contact and movable in a first direction in which the movable contact contacts the fixed contact and a second direction in which the movable contact is separated from the fixed contact. With the contact piece,
A magnet portion that generates a magnetic field for extending an arc generated between the fixed contact and the movable contact in the lateral direction of the movable contact piece .
Equipped with
The pair of fixed terminals includes a first extending portion extending from the fixed contact in a third direction parallel to the lateral direction and protruding in the third direction with respect to the movable contact piece.
The movable contact piece includes a second extending portion extending from the movable contact in a fourth direction opposite to the third direction and projecting in the fourth direction with respect to the pair of fixed terminals.
Electromagnetic relay. It is further extended in the second direction from the first extension portion of the pair of fixed terminals to further include an arc extension space for extending the arc .
The electromagnetic relay according to claim 1 . The corner portion of the movable contact piece in the third direction has a chamfered shape.
The electromagnetic relay according to claim 2 . Further comprising an arc horn extending from the movable contact piece in the second direction and connected to the movable contact piece on the third direction side of the movable contact piece.
The electromagnetic relay according to claim 2 . The arc horn is arranged so as to be inclined toward the center of the movable contact piece in the lateral direction.
The electromagnetic relay according to claim 4 . It is further extended in the first direction from the second stretched portion of the movable contact piece and further includes an arc extension space for extending the arc .
The electromagnetic relay according to claim 1 . The corners of the pair of fixed terminals in the fourth direction have a chamfered shape.
The electromagnetic relay according to claim 6 . Further comprising an arc horn extending from the pair of fixed terminals towards the first direction and connected to the pair of fixed terminals on the fourth direction side of the pair of fixed terminals.
The electromagnetic relay according to claim 6 . The arc horn is arranged so as to be inclined toward the center of the pair of fixed terminals in the lateral direction of the movable contact piece.
The electromagnetic relay according to claim 8 . The pair of fixed terminals are plate-shaped terminals extending in the longitudinal direction of the movable contact piece.
The electromagnetic relay according to any one of claims 1 to 9 .

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