JP2020107548A - Electromagnetic relay - Google Patents

Abstract

To make it possible to easily control an extension direction of an arc in an electromagnetic relay.SOLUTION: An electromagnetic relay comprises: a pair of stationary terminals; a movable contact piece; and a magnet part. The pair of stationary terminals include stationary contacts. The movable contact piece includes movable contacts arranged opposite to the stationary contacts. The movable contact piece is movable in a first direction in which the movable contacts come into contact with the stationary contacts and a second direction in which the movable contacts are separated from the stationary contacts. The magnet part generates a magnetic field for extending an arc generated between the stationary contacts and the movable contacts. Either one of the pair of stationary terminals or the movable contact piece includes extension parts that extend in the extension direction of the arc beyond the other of the pair of stationary terminals or the movable contact piece, and through which the arc passes.SELECTED DRAWING: Figure 3

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 is capable of contacting the fixed contact, and the electric circuit is opened and closed by the movable contact coming into contact with the fixed contact or being separated from the fixed contact. Further, the electromagnetic relay is provided with a permanent magnet for extending an arc generated when the movable contact separates from the fixed contact (see Patent Document 1). As a result, the 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 arc extension direction. Therefore, when the arc is expanded by the Lorentz force, the arc is expanded substantially evenly in the vertical direction.

Japanese Patent No. 6281301

In an electromagnetic relay, there are cases where it is desired to extend the arc greatly in one direction for the convenience of design or effective use of space and the like. However, in the electromagnetic relay of Patent Document 1, since the arc extends substantially evenly in the vertical direction, for example, it is difficult to extend the arc downward more than above.

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

An electromagnetic relay according to an aspect of the present invention includes a pair of fixed terminals, a movable contact piece, and a magnet section. The pair of fixed terminals includes fixed contacts. The movable contact piece includes a movable contact arranged to face the fixed contact. The movable contact piece is movable in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact separates from the fixed contact. The magnet section generates a magnetic field for extending an arc generated between the fixed contact and the movable contact. One of the pair of fixed terminals or the movable contact piece includes an extension portion that extends in the arc extension direction and passes through the arc more than the other of the pair of fixed terminals or the movable contact piece.

In this electromagnetic relay, for example, when the pair of fixed terminals includes the extending portion, the extending portion extends in the arc extending direction more than the movable contact piece. Therefore, the arc extending direction of the pair of fixed terminals extends from the fixed contact. Is greater than the distance from the movable contact to the end located in the arc extension direction of the movable contact piece. Therefore, the end of the arc on the fixed contact side moves in the extension direction of the arc 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, even when the movable contact piece includes the extending portion, the same effect can be obtained.

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

Preferably, the electromagnetic relay further comprises an arc extension space extended from the movable contact piece in the second direction to extend the arc. The pair of fixed terminals includes the extending portion. In this case, since the arc can be greatly expanded in the second direction rather than the first direction, the arc can be greatly expanded toward the arc expansion space expanded in the second direction.

Preferably, the corner portion in the extending direction of the movable contact piece has 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 includes an arc horn that extends from the movable contact piece in the second direction and is connected to the movable contact piece on the extension direction side of the movable contact piece. In this case, the arc can be extended further toward the arc extension space.

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

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

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

Preferably, the electromagnetic relay further includes an arc horn that extends from the pair of fixed terminals in the first direction and is 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 extended further toward the arc extension space.

Preferably, the arc horn is arranged so as to be inclined in a direction approaching the center of the pair of fixed terminals in the lateral direction of the movable contact piece. In this case, the arc can be extended further 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 the electromagnetic relay using the plate-shaped fixed terminal, it becomes possible to easily control the extension direction of the arc.

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

It is a cross-sectional schematic diagram of an electromagnetic relay. It is the schematic diagram which looked at the inside of a storage part from the upper part. It is the cross-sectional schematic diagram which looked at the cross section of the 1st fixed contact periphery in the direction which goes to a 2nd magnet from a 1st magnet. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a figure corresponding to FIG. 3 which concerns on other embodiment. It is a cross-sectional schematic diagram of the 1st fixed terminal which concerns on other embodiment.

Hereinafter, embodiments of an electromagnetic relay according to an aspect of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of the 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 is referred to as “upper”, the lower side is referred to as “lower”, the left side is referred to as “left”, and the right side in FIG. In addition, the direction orthogonal to the paper surface of FIG. 1 will be described as the front-back direction. In this embodiment, the upper side in FIG. 1 is the contact direction Z1. Further, the lower side in FIG. 1 is the opening direction Z2. Details of the contact direction Z1 and the opening direction Z2 will be described later.

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

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

FIG. 2 is a schematic view of the inside of the housing portion 11 viewed from above. The housing 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 11 a to 11 d is the front, rear, left, and right inner side surfaces of the housing portion 11. The first inner wall surface 11a and the second inner wall surface 11b extend vertically and horizontally. The first inner wall surface 11a and the second inner wall surface 11b are arranged 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 up-down direction and the front-rear direction. The third inner wall surface 11c and the fourth inner wall surface 11d are arranged to face each other in the left-right direction. The horizontal dimension of the first inner wall surface 11a and the second inner wall surface 11b is longer than the vertical dimension of the third inner wall surface 11c and the fourth inner wall surface 11d.

The housing portion 11 includes a housing space 12 that houses the contact device 3. In the present embodiment, the accommodation space 12 is a substantially rectangular parallelepiped space 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 1st fixed terminal 14, the 2nd fixed terminal 15, and the movable contact piece 16 are formed with the material which has electroconductivity.

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 at intervals in the left-right direction. The first fixed terminal 14 and the second fixed terminal 15 are an example 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 14 a is arranged in the accommodation space 12. The first external connection portion 14b projects leftward 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 15 a is arranged in the accommodation space 12. The second external connection portion 15b projects rightward 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 at a distance from the first inner wall surface 11a and the second inner wall surface 11b in the front-rear direction. Arc extension spaces 12a and 12b for extending the 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 a first movable contact 16a described later, or the second fixed contact 15a and a second movable contact 16b described later. The arc extension spaces 12a and 12b are expanded toward the opening direction Z2 side of the movable contact piece 16 rather than 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 addition, in this embodiment, the longitudinal direction of the movable contact piece 16 corresponds to the left-right direction. Moreover, the lateral direction of the movable contact piece 16 corresponds to the front-back 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 so as to face the first fixed contact 14a and can contact the first fixed contact 14a. The second movable contact 16b is arranged at a distance in the left-right direction from the first movable contact 16a. The 2nd movable contact 16b is arranged facing the 2nd fixed contact 15a, and can contact the 2nd fixed contact 15a.

The movable contact piece 16 is movable in a contact direction Z1 that contacts the first fixed contact 14a and the second fixed contact 15a and a separation direction Z2 that separates 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 opening direction Z2 is an example of the second direction.

The contact direction Z1 is a 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 (the upper side in FIG. 1). The opening/closing direction Z2 is a direction (downward in FIG. 1) 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.

The contact piece holder 17 holds the movable contact piece 16 via the drive shaft 4, as shown in FIG. The contact piece holder 17 connects the movable contact piece 16 and the drive shaft 4. The contact piece holder 17 includes a holder 24 and a contact spring 25. The contact spring 25 biases 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 is movable in the contact direction Z1 and the opening 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 the electromagnetic force. The electromagnetic drive device 5 is arranged in the housing 2 below the housing portion 11.

The electromagnetic drive device 5 includes a movable iron core 31, a fixed iron core 32, and a yoke 33. In addition, 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 unit 6 causes a magnetic field 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 into the accommodation unit 11. generate. Specifically, as shown in FIG. 1, the magnet unit 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 vertical direction. In the present embodiment, the first magnet 6a and the second magnet 6b are fixed to the outer circumference of the housing portion 11. The 1st magnet 6a and the 2nd magnet 6b are arranged so that the different poles may face each other in the longitudinal direction of the movable contact piece 16 around the housing portion 11. The first magnet 6 a is arranged such that the north pole faces the housing 11. The second magnet 6 b is arranged such that the S pole faces the accommodation portion 11. Due to the first magnet 6a and the second magnet 6b arranged in this way, magnetic flux flows in the accommodation 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 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 movable iron core 31 in the contact direction Z1, 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 fixed contact 14a. It contacts 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 by 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, between the first movable contact 16a and the first fixed contact 14a, and 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 toward the first movable contact 16a, the arc generated between the first fixed contact 14a and the first movable contact 16a becomes first in the arc. 2 Lorentz force F1 acts in the direction toward the inner wall surface 11b. As a result, the arc is expanded in the arc expansion space 12a. 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 expanded in the arc expansion space 12b. When the current flows from the first movable contact 16a to 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 directions described above. In the present embodiment, unless otherwise specified, the direction of current flow will be described as the direction from the first fixed contact 14a to the first movable contact 16a.

FIG. 3 is a schematic cross-sectional view of the cross section around the first fixed contact 14a as seen in the direction from the first magnet 6a to the second magnet 6b. FIG. 3 schematically shows how the Lorentz force F1 acting on the arc extends 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 a surface of the first fixed terminal 14 on the opening direction Z2 side. 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 this 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 a surface opposite to the third surface 20c, and is a front surface of the first fixed terminal 14. The third surface 20c and the fourth surface 20d extend vertically and horizontally.

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 a 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 opening direction Z2 side. The first surface 30a and the second surface 30b extend in the front-rear direction and the left-right direction. In this 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 a surface opposite to the third surface 30c, and is a front surface of the movable contact piece 16. The third surface 30c and the fourth surface 30d extend vertically and horizontally.

The first fixed terminal 14 extends longer than the movable contact piece 16 in the front-back 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 more than the first surface 30a of the movable contact piece 16. Both ends of the first surface 20a of the first fixed terminal 14 are positioned outside the both ends of the first surface 30a of the movable contact piece 16 in the lateral direction. The third surface 20c of the first fixed contact 14a is located rearward of 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 an extending portion 21. In the present embodiment, the extending portion 21 is configured by a part of the first surface 20a and is arranged at least in a portion through which the arc passes. For example, the extending portion 21 may be arranged only in the range close to the first fixed contact 14a of the first fixed terminal 14 located in the arc extending direction. In the present embodiment, the extension portion 21 extends in the arc extension direction over the entire length of the first fixed terminal 14.

The extending portion 21 is arranged on the rear end side of the first fixed terminal 14. The extension portion 21 extends in the arc extension direction more than the movable contact piece 16. The extending portion 21 extends rearward of 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 extending 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 extending direction of the arc in the present embodiment means the same direction as the Lorentz force acting on the arc. However, in this embodiment, the direction of the Lorentz force acting on the arc changes as the arc moves. Therefore, more accurately, the arc extension direction means the direction of the Lorentz force acting on the arc at the time when the arc is generated between the first movable contact 16a and the first fixed contact 14a. In the present embodiment, the arc extension direction 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 first end. 2 Moves in the direction toward the inner wall surface 11b, and the arc is expanded in the arc expansion space 12a.

As shown in FIG. 3, until the second end A2 of the arc moves from the first movable contact 16a to the rear end of the first surface 30a, the first end A1 of the arc and the second end A2 of the arc are in the vertical direction. Move at approximately the same speed so that they overlap. Then, 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 extending portion 21, there is a vertical shift between the first end A1 of the arc and the second end A2 of the arc. The direction of the Lorentz force F1 that occurs and acts on the arc changes rearward and toward the opening direction Z2. As a result, the arc can be extended more downward than upward, so that the extension direction of the arc can be easily controlled. Here, the arc can be extinguished quickly by efficiently extending the arc in the arc extension space 12a.

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 scope 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 housing 11 may be changed.

For example, the first fixed terminal 14 and the second fixed terminal 15 may have a shape that is bent into a substantially L shape inside the housing 2. In addition, 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 drawn toward the first fixed terminal 14 and the second fixed terminal 15 by the electromagnetic drive device 5. You may operate like. 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-described embodiment, the first fixed terminal 14 has the configuration including the extending portion 21, but the movable contact piece 16 may include the extending portion 21 as shown in FIG. 4. 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, the arc extension spaces 12a and 12b are preferably 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 in the opening direction Z2 from the third surface 30c and the fourth surface 30d of the movable contact piece 16 and is connected to both ends of the movable contact piece 16 in the lateral direction. In this case, the arc can be further extended 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 on the second surface side 30b of the movable contact piece 16 so as to be inclined in a direction approaching the center of the movable contact piece 16 in the lateral direction. In this case, the arc can be extended further downward. In addition, 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 in the contact direction Z<b>1 and extends in the arc extension 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 inclined 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 corners C1 to C4 of the movable contact piece 16 may have a chamfered shape. In particular, by chamfering the corners C1 and C2 located in the arc extension direction here, the second end A2 of the arc can be smoothly moved from the first surface 30a to the second surface 30b. As a result, the arc can be rapidly extended greatly downward. The chamfered shape is, for example, a C chamfered shape or an R chamfered shape. In addition, as shown in FIG. 10, when the movable contact piece 16 includes the extending 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 size of the first fixed contact 14a in the lateral direction of the movable contact piece 16 may be larger than the size of the first movable contact 16a in the lateral direction of the movable contact piece 16.

Further, when the electromagnetic relay 100 has a polarity and the arc extension direction is changed depending on the polarity, the positions of the first fixed terminal 14 and the movable contact piece 16 are displaced 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 30 a of the movable contact piece 16 is extended forward of the first surface 20 a of the first fixed terminal 14 and the extending portion 22 corresponding to the extending portion 21 is formed. Good. In this case, it is preferable that the corners C1 to C4 of the first fixed terminal 14 and the corners C5 to C8 of the movable contact piece 16 have chamfered shapes.

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 14 a may be integrated with the first fixed terminal 14. In this case, the first surface 20a of the first fixed terminal 14 contacts 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 the 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 1st fixed terminal 14a 1st 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 Stretching Part 22 Stretching Part 40 Arc Horn 100 Electromagnetic Relay

Claims (11)

A pair of fixed terminals including fixed contacts,
A movable contact including a movable contact arranged to face the fixed contact, the movable contact being movable in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact is separated from the fixed contact. A contact piece,
A magnet section for generating a magnetic field for extending an arc generated between the fixed contact and the movable contact,
Equipped with
Either one of the pair of fixed terminals or the movable contact piece has an extension portion that extends in the extension direction of the arc more than the other of the pair of fixed terminals or the movable contact piece and that the arc passes through. Including,
Electromagnetic relay. The extension direction is parallel to the lateral direction of the movable contact piece,
The electromagnetic relay according to claim 1. An arc extension space for extending the arc from the movable contact piece in the second direction,
The pair of fixed terminals includes the extending portion,
The electromagnetic relay according to claim 1 or 2. The corner portion of the movable contact piece in the extending direction has a chamfered shape,
The electromagnetic relay according to claim 3. An arc horn that extends from the movable contact piece in the second direction and is connected to the movable contact piece on the extension direction side of the movable contact piece is further provided.
The electromagnetic relay according to claim 3. The arc horn is arranged so as to be inclined in a direction approaching the center of the movable contact piece in the lateral direction.
The electromagnetic relay according to claim 5. Further comprising an arc extension space for extending the arc from the pair of fixed terminals in the first direction,
The movable contact piece includes the extending portion,
The electromagnetic relay according to claim 1 or 2. Corners in the extending direction of the pair of fixed terminals have a chamfered shape,
The electromagnetic relay according to claim 7. An arc horn that extends from the pair of fixed terminals in the first direction and is connected to the pair of fixed terminals on the extension direction side of the pair of fixed terminals is further provided.
The electromagnetic relay according to claim 7. The arc horn is arranged so as to be inclined in a direction approaching the center of the pair of fixed terminals in the lateral direction of the movable contact piece.
The electromagnetic relay according to claim 9. 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 10.

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