JP2022139817A - electromagnetic relay - Google Patents

Abstract

To suppress sticking of an arc at a fixed terminal to facilitate extending of the arc, in an electromagnetic relay.SOLUTION: An electromagnetic relay comprises a fixed contact, a movable contact, a movable contact piece, a drive device, a magnet, and a fixed terminal. The movable contact is arranged so as to be opposed to the fixed contact in a first direction. The movable contact piece is connected with the movable contact. The drive device moves the movable contact piece in the first direction. The magnet generates a magnetic field for exerting a Lorentz force toward a second direction crossing the first direction on an arc generated between the fixed contact and the movable contact. The fixed terminal includes a recessed groove to which the fixed contact is attached. The recessed groove extends in the second direction, penetrating through the fixed terminal.SELECTED DRAWING: Figure 4

Description

The present invention relates to electromagnetic relays.

Some electromagnetic relays have recesses for positioning fixed contacts on the surfaces of fixed terminals. For example, in Patent Document 1, fixed contacts are arranged in recesses on the surface of fixed terminals. The fixed contact protrudes from the surface of the fixed terminal.

On the other hand, in an electromagnetic relay, an arc is generated at the contacts when current is interrupted. Therefore, some electromagnetic relays are equipped with magnets for extinguishing arcs. The Lorentz force acting on the arc by the magnet elongates the arc, thereby rapidly extinguishing the arc.

Japanese Patent No. 6281301

In an electromagnetic relay in which a fixed terminal is provided with a concave portion, there is a step around the fixed contact. Therefore, the arc agglutinates at the steps, making it difficult to extend the arc. SUMMARY OF THE INVENTION An object of the present invention is to make it easier to extend an arc by suppressing sticking of an arc at a fixed terminal in an electromagnetic relay.

An electromagnetic relay according to one aspect of the present invention includes a fixed contact, a movable contact, a movable contact piece, a driving device, a magnet, and a fixed terminal. The movable contact is arranged to face the fixed contact in the first direction. A movable contact piece is connected to the movable contact. The driving device moves the movable contact piece in the first direction. The magnet generates a magnetic field for applying a Lorentz force in a second direction intersecting the first direction to the arc generated between the fixed contact and the movable contact. The fixed terminal includes a groove in which the fixed contact is attached. The groove extends through the fixed terminal in the second direction.

In the electromagnetic relay according to this aspect, the Lorentz force acts in the second direction, and the concave groove extends through the fixed terminal in the second direction. Therefore, the arc moves along the concave groove. As a result, sticking of the arc at the fixed terminal is suppressed, and the arc is easily extended.

The fixed terminal may further include side surfaces. The groove may extend to the side surface in the second direction. The fixed contact may extend to the side surface in the second direction. In this case, the arc can be easily moved to the side surface of the fixed terminal along the concave groove.

The stationary contact may include curved corners. In this case, extension of the arc is promoted at the corners of the stationary contact. The corner may be positioned at the end in the second direction of the fixed contact. In this case, arc extension is further promoted at the corners of the fixed contact. The fixed terminal may include curved corners. In this case, extension of the arc is promoted at the corners of the fixed terminal.

The groove may include a bottom surface, a first inner surface, a second inner surface, a first groove, and a second groove. The first inner surface may protrude from the bottom surface and extend in the first direction. The second inner surface may be located opposite the first inner surface and extend from the bottom surface in the first direction. A first groove may be disposed on the bottom surface along the first inner surface. A second groove may be disposed on the bottom surface along the second inner surface. In this case, even if there is an R shape due to machining between the first inner surface and the bottom surface and between the second inner surface and the bottom surface, the first groove and the second groove avoid the R shape. , the fixed contact can be brought into contact with the bottom surface. Thereby, the fixed contact is stably attached to the groove.

The stationary terminal may include a support surface that supports the stationary contact. A recessed groove may be disposed on the support surface. The stationary contact may protrude from the support surface. In this case, the fixed contact stably contacts the movable contact. Also, although there is a step between the fixed contact and the support surface, the arc moves along the recessed groove, thereby suppressing sticking of the arc at the step.

The fixed terminal may include a first plate portion, a second plate portion, and a third plate portion. The first plate portion may extend in the second direction. The second plate portion may extend in the first direction from the first plate portion. The third plate portion may extend in the first direction from the first plate portion. The third plate portion may be arranged apart from the second plate portion in the second direction. The groove may extend through the first plate portion in the second direction. In this case, in the U-shaped fixed terminal, sticking of the arc is suppressed and the arc is easily extended.

The fixed terminal may have a columnar shape including a circular bottom surface and a curved side surface. The groove may be arranged on the circular bottom surface and extend to the curved side surface. In this case, sticking of the arc is suppressed in the cylindrical fixed terminal, and the arc is easily extended.

The fixed terminal may include a linear plate portion. The linear plate portion may extend in a third direction crossing the first direction and the second direction. The groove may extend through the linear plate portion in the second direction. In this case, in the fixed terminal including the straight plate portion, sticking of the arc is suppressed and the arc is easily extended.

ADVANTAGE OF THE INVENTION According to this invention, it is an electromagnetic relay.

FIG. 4 is a cross-sectional view of an electromagnetic relay in an open state; FIG. 4 is a cross-sectional view of the electromagnetic relay in a closed state; FIG. 2 is a cross-sectional view taken along line III-III in FIG. 1; It is a perspective view of a 1st fixed terminal. It is a figure which shows the electromagnetic relay which concerns on a 1st modification. It is a figure which shows the 1st fixed terminal and 1st fixed contact which concern on a 2nd modification. It is a figure which shows the 1st fixed terminal and 1st fixed contact which concern on a 3rd modification. It is a figure which shows the 1st fixed terminal and 1st fixed contact which concern on a 4th modification. It is a figure which shows the 1st fixed terminal and 1st fixed contact which concern on a 5th modification. It is a figure which shows the 1st fixed terminal and 1st fixed contact which concern on a 6th modification. It is a figure which shows the 1st fixed terminal and 1st fixed contact which concern on a 7th modification.

An electromagnetic relay according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an electromagnetic relay 1 according to an embodiment. As shown in FIG. 1, the electromagnetic relay 1 includes a case 2, a contact device 3, and a drive device 4. As shown in FIG. The case 2 is made of an insulating material such as resin or ceramic. A contact device 3 is accommodated in the case 2 .

The contact device 3 includes a first fixed terminal 6, a second fixed terminal 7, a movable contact piece 8, a movable mechanism 9, a first fixed contact 10, a second fixed contact 11, and a first movable contact 12. , and the second movable contact 13 .

In the following description, the direction in which the first fixed contact 10 and the first movable contact 12 face each other is defined as the vertical direction (Z1, Z2). The vertical direction (Z1, Z2) is an example of the first direction. The vertical direction (Z1, Z2) includes upward (Z1) and downward (Z2). The direction from the first movable contact 12 to the first fixed contact 10 is defined as upward (Z1). A direction from the first fixed contact 10 to the first movable contact 12 is defined as downward (Z2).

The direction in which the movable contact piece 8 extends is defined as the longitudinal direction (X1, X2). The longitudinal direction (X1, X2) is a direction perpendicular to the vertical direction (Z1, Z2). The longitudinal direction (X1, X2) is an example of the third direction. The longitudinal direction (X1, X2) includes a first longitudinal direction (X1) and a second longitudinal direction (X2). The second longitudinal direction (X2) is opposite to the first longitudinal direction (X1). A direction from the second fixed contact 11 to the first fixed contact 10 is defined as a first longitudinal direction (X1). A direction from the first fixed contact 10 to the second fixed contact 11 is defined as a second longitudinal direction (X2).

The first fixed terminal 6, the second fixed terminal 7, the movable contact piece 8, the first fixed contact 10, the second fixed contact 11, the first movable contact 12, and the second movable contact 13 are electrically conductive. It is made of a material having properties. For example, the first fixed terminal 6, the second fixed terminal 7, and the movable contact piece 8 are made of metal materials known as terminal materials such as phosphor bronze, beryllium copper, brass, or tough pitch copper. However, the first fixed terminal 6, the second fixed terminal 7, and the movable contact piece 8 may be made of materials different from these materials. The first fixed contact 10, the second fixed contact 11, the first movable contact 12, and the second movable contact 13 are made of metal known as a contact material such as copper-based metal or silver-based metal.

The first fixed terminal 6 and the second fixed terminal 7 extend in the vertical direction (Z1, Z2). The first fixed terminal 6 and the second fixed terminal 7 have, for example, a cylindrical shape. The first fixed terminal 6 and the second fixed terminal 7 are spaced apart from each other in the longitudinal direction (X1, X2). A first fixed contact 10 is connected to the first fixed terminal 6 . A second fixed contact 11 is connected to the second fixed terminal 7 . The first fixed contact 10 and the second fixed contact 11 are arranged inside the case 2 .

The movable contact piece 8 , the first movable contact 12 and the second movable contact 13 are arranged inside the case 2 . The first movable contact 12 and the second movable contact 13 are connected to the movable contact piece 8 . The first movable contact 12 faces the first fixed contact 10 . The first movable contact 12 can be brought into contact with and separated from the first fixed contact 10 . The second movable contact 13 faces the second fixed contact 11 . The second movable contact 13 can be brought into contact with and separated from the second fixed contact 11 . The first movable contact 12 is spaced apart from the second movable contact 13 in the longitudinal direction (X1, X2).

The movable contact piece 8 is movable in the vertical direction (Z1, Z2). The movable contact piece 8 is movable between an open position shown in FIG. 1 and a closed position shown in FIG. As shown in FIG. 1, the movable contact piece 8 is in the open position and the movable contacts 12,13 are separated from the fixed contacts 10,11. As shown in FIG. 2, when the movable contact piece 8 is in the closed position, the movable contacts 12 and 13 are in contact with the fixed contacts 10 and 11 . Hereinafter, the direction in which the movable contacts 12 and 13 approach the fixed contacts 10 and 11 is defined as the contact direction. A direction in which the movable contacts 12 and 13 separate from the fixed contacts 10 and 11 is defined as a separation direction.

A movable mechanism 9 supports the movable contact piece 8 . The movable mechanism 9 includes a drive shaft 15 and contact springs 16 . A drive shaft 15 is connected to the movable contact piece 8 . The drive shaft 15 extends in the vertical direction (Z1, Z2) and passes through the movable contact piece 8 in the vertical direction (Z1, Z2). The drive shaft 15 is provided movably in the vertical direction (Z1, Z2). The contact spring 16 biases the movable contact piece 8 in the contact direction.

The drive device 4 includes a coil 21 , a spool 22 , a movable core 23 , a fixed core 24 , a yoke 25 and a return spring 26 . The driving device 4 uses electromagnetic force to move the movable contact piece 8 between the open position and the closed position via the movable mechanism 9 . Coil 21 is wound around spool 22 . The movable core 23 and the fixed core 24 are arranged inside the spool 22 . The movable iron core 23 is connected to the drive shaft 15 . The movable iron core 23 is movable in the vertical direction (Z1, Z2). The fixed core 24 is arranged to face the movable core 23 . The return spring 26 biases the movable iron core 23 in the opening direction.

In the electromagnetic relay 1 , when the coil 21 is energized, the magnetic force generated by the magnetic field generated by the coil 21 attracts the movable core 23 to the fixed core 24 . Thereby, the movable iron core 23 and the drive shaft 15 move in the contact direction against the biasing force of the return spring 26 . Thereby, the movable contact piece 8 moves to the closed position shown in FIG. After the movable contacts 12 and 13 contact the fixed contacts 10 and 11, the contact spring 16 is compressed by further movement of the drive shaft 15 in the contact direction.

When the coil 21 is deenergized, the movable iron core 23 and the drive shaft 15 are moved in the separating direction by the biasing force of the return spring 26 . As a result, the movable contact piece 8 moves to the open position shown in FIG.

The electromagnetic relay 1 has magnets 41 and 42 . Magnets 41 and 42 generate magnetic fields for extending arcs generated between first fixed contact 10 and first movable contact 12 and between second fixed contact 11 and second movable contact 13 . The magnets 41, 42 are arranged outside the first fixed terminal 6 and the second fixed terminal 7 in the longitudinal direction (X1, X2).

Magnets 41 and 42 include a first magnet 41 and a second magnet 42 . The first magnet 41 and the second magnet 42 are permanent magnets. The first magnet 41 and the second magnet 42 are arranged around the case 2 . However, the first magnet 41 and the second magnet 42 may be arranged inside the case 2 . The first magnet 41 is arranged in the first longitudinal direction (X1) with respect to the first fixed terminal 6 . The second magnet 42 is arranged in the second longitudinal direction (X2) with respect to the second fixed terminal 7 .

FIG. 3 is a cross-sectional view taken along line III--III in FIG. Hereinafter, directions perpendicular to the longitudinal directions (X1, X2) and the vertical directions (Z1, Z2) are defined as lateral directions (Y1, Y2). The lateral direction (Y1, Y2) is an example of the second direction. Also, one of the lateral directions (Y1, Y2) is defined as a first lateral direction (Y1), and the direction opposite to the first lateral direction (Y1) is defined as a second lateral direction (Y2).

The first magnet 41 and the second magnet 42 generate a magnetic field inside the case 2 . An arrow A1 indicated by a two-dot chain line in FIG. 3 indicates the magnetic field generated by the first magnet 41 and the second magnet 42 . The first magnet 41 and the second magnet 42 are arranged with different poles facing each other. For example, the north pole of the first magnet 41 faces the south pole of the second magnet 42 .

When a current flows from the first fixed terminal 6 through the movable contact piece 8 to the second fixed terminal 7, as shown in FIG. A first Lorentz force F1 acts on the arc generated at and. The first Lorentz force F1 acts in the first lateral direction (Y1). The arc is thereby elongated in the direction of the first Lorentz force F1. Also, the second Lorentz force F2 acts on the arc generated between the second fixed contact 11 and the second movable contact 13 by the magnetic field from the second magnet 42 . The second Lorentz force F2 acts in the second lateral direction (Y2). The arc is thereby elongated in the direction of the second Lorentz force F2.

Contrary to the above, when the current flows from the second fixed terminal 7 through the movable contact piece 8 to the first fixed terminal 6, the magnetic field from the first magnet 41 causes the first fixed contact 10 and the first movable contact 12 to move. A first Lorentz force F1' acts on the arc generated at . The first Lorentz force F1' acts in the second lateral direction (Y2). The arc is thereby elongated in the direction of the first Lorentz force F1'. A second Lorentz force F<b>2 ′ acts on the arc generated between the second fixed contact 11 and the second movable contact 13 by the magnetic field from the second magnet 42 . The second Lorentz force F2' acts in the first lateral direction (Y1). The arc is thereby elongated in the direction of the second Lorentz force F2'.

FIG. 4 is a perspective view of the first fixed terminal 6. FIG. As shown in FIG. 4, the first fixed terminal 6 has a U-shape. Specifically, the first fixed terminal 6 includes a first plate portion 31 , a second plate portion 32 and a third plate portion 33 . The first plate portion 31 extends in the horizontal direction (Y1, Y2). The second plate portion 32 and the third plate portion 33 extend from the first plate portion 31 in the vertical direction (Z1, Z2). The second plate portion 32 and the third plate portion 33 are arranged apart from each other in the horizontal direction (Y1, Y2). The first fixed terminal 6 includes a first concave groove 34 . The first concave groove 34 is provided on the first plate portion. The first fixed terminal 6 is arranged in the first concave groove 34 . The first fixed terminal 6 is attached to the first groove 34 by fixing means such as welding or caulking.

The first groove 34 extends through the first fixed terminal 6 in the lateral direction (Y1, Y2). The first groove 34 extends through the first plate portion 31 in the lateral direction (Y1, Y2). The first fixed terminal 6 includes a first side surface 35 and a second side surface 36 . The first side surface 35 is one side surface of the first fixed terminal 6 in the horizontal direction (Y1, Y2), and the second side surface 36 is the other side surface of the first fixed terminal 6 in the horizontal direction (Y1, Y2). be. The first groove 34 extends from the first side surface 35 to the second side surface 36 in the lateral direction (Y1, Y2). The first fixed contact 10 extends from the first side 35 to the second side 36 in the lateral direction (Y1, Y2). The first fixed contact 10 is arranged flush with the first side surface 35 . The first fixed contact 10 is arranged flush with the second side surface 36 .

The first recessed groove 34 includes a bottom surface 37 , a first inner surface 38 and a second inner surface 39 , the first inner surface 38 and the second inner surface 39 protruding from the bottom surface 37 . The first inner side surface 38 and the second inner side surface 39 extend in the vertical direction (Z1, Z2). The second inner side surface 39 is arranged on the opposite side of the first side surface 35 in the longitudinal direction (X1, X2). The first fixed terminal 6 includes a support surface 40 that supports the first fixed contact 10 . The support surface 40 is the surface of the first plate portion 31 . The first groove 34 is arranged on the support surface 40 . The first fixed contact 10 protrudes from the support surface 40 in the vertical direction (Z1, Z2).

As shown in FIG. 3 , the second fixed terminal 7 includes a second recessed groove 43 . The second fixed contact 11 is arranged in the second groove 43 and fixed to the second groove 43 . The second groove 43 extends through the second fixed contact 11 in the lateral direction (Y1, Y2). The second groove 43 has the same shape as the first groove 34 . The second fixed terminal 7 has the same shape as the first fixed terminal 6, and detailed description thereof will be omitted.

In the electromagnetic relay 1 according to the present embodiment described above, the Lorentz forces F1, F1', F2, F2' act in the lateral direction (Y1, Y2), and the first concave groove 34 acts in the lateral direction (Y1, Y2). , extending through the first fixed terminal 6 . Therefore, the arc moves along the first concave groove 34 . Thereby, sticking of the arc at the first fixed terminal 6 is suppressed, and the arc is easily extended.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the invention.

The structure of the driving device 4 is not limited to that of the above embodiment, and may be modified. For example, in the above embodiment, the drive device 4 is arranged below the contact device 3 (Z2). However, the drive device 4 may also be arranged longitudinally (X1, X2) or transversely (Y1, Y2) with respect to the contact device 3 . In the above embodiment, the contact direction is upward (Z1) and the release direction is downward (Z2). However, the contact direction may be downward (Z2) and the release direction upward (Z1).

The structure of the contact device 3 is not limited to that of the above embodiment, and may be modified. For example, the number of fixed contacts and movable contacts is not limited to two, and may be one or more than two. The first fixed contact 10 may be separate from or integrated with the first fixed terminal 6 . The second fixed contact 11 may be separate from or integrated with the second fixed terminal 7 . The first movable contact 12 may be separate from or integral with the movable contact piece 8 . The second movable contact 13 may be separate from or integral with the movable contact piece 8 .

The arrangement of the magnets is not limited to that of the above embodiment, and may be changed. For example, the first magnet 41 and the second magnet 42 may be arranged such that the same poles face each other. For example, the S pole of the first magnet 41 and the S pole of the second magnet 42 may be arranged to face each other.

FIG. 5 is a diagram showing an electromagnetic relay 1 according to a first modified example. As shown in FIG. 5, the first magnet 41 and the second magnet 42 may be arranged facing each other in the lateral direction (Y1, Y2). In FIG. 5, arrows A3 and A4 indicate magnetic fields generated by the first magnet 41 and the second magnet . The first magnet 41 and the second magnet 42 may be arranged with different poles facing each other. For example, the north pole of the first magnet 41 may face the south pole of the second magnet 42 .

In this case, when a current flows from the first fixed terminal 6 through the movable contact piece 8 to the second fixed terminal 7, a first Lorentz force F1 acts on the arc generated between the first fixed contact 10 and the first movable contact 12. do. The first Lorentz force F1 acts in the second longitudinal direction (X2). The arc is thereby elongated in the direction of the first Lorentz force F1. A second Lorentz force F2 acts on the arc generated between the second fixed contact 11 and the second movable contact 13 . The second Lorentz force F2 acts in the first longitudinal direction (X1). The arc is thereby elongated in the direction of the second Lorentz force F2.

Contrary to the above, when the current flows from the second fixed terminal 7 through the movable contact piece 8 to the first fixed terminal 6, the arc generated between the first fixed contact 10 and the first movable contact 12 causes the first Lorentz force F1' acts. The first Lorentz force F1' acts in the first longitudinal direction (X1). The arc is thereby elongated in the direction of the first Lorentz force F1'. A second Lorentz force F<b>2 ′ acts on the arc generated between the second fixed contact 11 and the second movable contact 13 . The second Lorentz force F2' acts in the second longitudinal direction (X2). The arc is thereby elongated in the direction of the second Lorentz force F2'.

In the first variant, the Lorentz forces F1, F1' F2, F2' act in the longitudinal direction (X1, X2). Therefore, in the first modified example, the longitudinal direction (X1, X2) corresponds to the second direction. The first groove 34 may extend through the first fixed terminal 6 in the longitudinal direction (X1, X2). The second groove 43 may extend through the second fixed terminal 7 in the longitudinal direction (X1, X2). Other structures of the first modified example are the same as those of the above-described embodiment. The first magnet 41 and the second magnet 42 may be arranged with the same poles facing each other.

FIG. 6 is a diagram showing a first fixed terminal 6 and a first fixed contact 10 according to a second modified example. As shown in FIG. 6 , the first fixed contact 10 may include a first corner 51 and a second corner 52 . The first corner portion 51 is located at one end of the first fixed contact 10 in the horizontal direction (Y1, Y2). The second corner 52 is located at the other end in the horizontal direction (Y1, Y2) of the first fixed contact 10 . The first corner 51 may have a curved shape. The second corner 52 may have a curved shape. In this case, extension of the arc is promoted at the first corner 51 and the second corner 52 .

The curved first corner may be located at one end of the first fixed contact 10 in the longitudinal direction (X1, X2). The curved second corner may be located at the other end of the first fixed contact 10 in the longitudinal direction (X1, X2).

FIG. 7 is a diagram showing a first fixed terminal 6 and a first fixed contact 10 according to a third modification. As shown in FIG. 7 , the first fixed terminal 6 may include a first corner portion 53 and a second corner portion 54 . The first corner portion 53 is located at one end of the first fixed terminal 6 in the horizontal direction (Y1, Y2). The second corner 54 is located at the other end of the first fixed contact 10 in the horizontal direction (Y1, Y2). The first corner 53 may have a curved shape. The second corner 54 may have a curved shape. In this case, extension of the arc is promoted at the first corner portion 53 and the second corner portion 54 .

The curved first corner may be located at one end of the first fixed contact 10 in the longitudinal direction (X1, X2). The curved second corner may be located at the other end of the first fixed contact 10 in the longitudinal direction (X1, X2).

FIG. 8 is a diagram showing a first fixed terminal 6 and a first fixed contact 10 according to a fourth modification. As shown in FIG. 8 , the first groove 34 may include a first groove 55 and a second groove 56 . A first groove 55 is disposed on the bottom surface 37 along the first inner surface 38 . A second groove 56 is disposed on the bottom surface 37 along the second inner surface 39 . The bottom surface 37 has a flat shape between the first groove 55 and the second groove 56 . First fixed contact 10 includes a flat bottom surface 57 . The bottom surface 57 of the first fixed contact 10 is in contact with the bottom surface 37 of the first groove 34 .

In this case, even if there is an R shape due to machining between the first inner side surface 38 and the bottom surface 37 and between the second inner side surface 39 and the bottom surface 37, the first groove 55 and the second groove 56 , the bottom surface 57 of the first fixed contact 10 can be brought into contact with the bottom surface 37 of the first groove 34 by avoiding the R shape. Thereby, the first fixed contact 10 is stably attached to the first concave groove 34 . Also, when the first fixed contact 10 is fixed to the first recessed groove 34 by welding, excess brazing material enters the first groove 55 and the second groove 56 . Thereby, the height of the first fixed contact 10 can be stabilized.

FIG. 9 is a diagram showing a first fixed terminal 6 and a first fixed contact 10 according to a fifth modification. As shown in FIG. 9, the first fixed terminal 6 may have a cylindrical shape. The first fixed terminal 6 may include a circular bottom surface 58 and a curved side surface 59 . The first groove 34 may be arranged on the circular bottom surface 58 . The first concave groove 34 may extend to the curved side surface 59 .

FIG. 10 is a diagram showing a first fixed terminal 6 and a first fixed contact 10 according to a sixth modification. As shown in FIG. 10 , the first fixed terminal 6 may include a straight plate portion 61 . The linear plate portion 61 may extend in the longitudinal direction (X1, X2). The first groove 34 may extend through the linear plate portion 61 in the lateral direction (Y1, Y2). The first fixed terminal 6 may have an L-shaped bent shape, as shown in FIG. Alternatively, the first fixed terminal 6 may have a shape extending straight in the longitudinal direction (X1, X2).

In the above embodiment, the first fixed contact 10 is arranged flush with the first side surface 35 and the second side surface 36 of the first fixed terminal 6 . However, the first fixed contact 10 does not have to be arranged flush with the first side surface 35 and the second side surface 36 of the first fixed terminal 6 .

FIG. 11 is a diagram showing a first fixed terminal 6 and a first fixed contact 10 according to a seventh modification. As shown in FIG. 11, the first fixed contact 10 may be shorter than the first groove 34 in the horizontal direction (Y1, Y2). The first fixed contact 10 includes a first end face 62 and a second end face 63 . The first end surface 62 and the second end surface 63 face the horizontal direction (Y1, Y2). The first end surface 62 may be located inside the first side surface 35 in the lateral direction (Y1, Y2). The second end surface 63 may be located inside the second side surface 36 in the lateral direction (Y1, Y2).

Although the first fixed terminal 6 and the first fixed contact 10 have been described in the above modified example, the second fixed terminal 7 may also have the same shape as the first fixed terminal 6 according to the above modified example. . The second fixed contact 11 may also have the same shape as the first fixed contact 10 according to the modification.

ADVANTAGE OF THE INVENTION According to this invention, it is an electromagnetic relay.

4: drive device, 6: first fixed terminal, 8: movable contact piece, 10: first fixed contact, 12: first movable contact, 31: first plate, 32: second plate, 33: third Plate portion 34: First concave groove 35: First side surface 37: Bottom surface 38: First inner side surface 39: Second inner side surface 40: Support surface 41 First magnet 51: First corner , 53: first corner, 55: first groove, 56: second groove, 58: circular bottom surface, 59: curved side surface, 61: linear plate portion

Claims (10)

a fixed contact;
a movable contact arranged to face the fixed contact in a first direction;
a movable contact piece connected to the movable contact;
a driving device for moving the movable contact piece in the first direction;
a magnet for generating a magnetic field for applying a Lorentz force in a second direction intersecting the first direction to the arc generated between the fixed contact and the movable contact;
a fixed terminal including a groove to which the fixed contact is attached;
with
the groove extends through the fixed terminal in the second direction,
electromagnetic relay. The fixed terminal further includes a side surface,
The concave groove extends to the side surface in the second direction,
The fixed contact extends to the side surface in the second direction,
The electromagnetic relay according to claim 1. The fixed contact includes a curved corner,
The electromagnetic relay according to claim 1 or 2. The corner portion is located at an end in the second direction of the fixed contact,
The electromagnetic relay according to claim 3. The fixed terminal includes a curved corner,
The electromagnetic relay according to any one of claims 1 to 4. The concave groove is
a bottom surface;
a first inner surface projecting from the bottom surface and extending in the first direction;
a second inner surface disposed opposite to the first inner surface and extending from the bottom surface in the first direction;
a first groove disposed on the bottom surface along the first inner surface;
a second groove disposed on the bottom surface along the second inner surface;
including,
The electromagnetic relay according to any one of claims 1 to 5. the fixed terminal includes a support surface that supports the fixed contact;
the recessed groove is disposed on the support surface;
the stationary contact protrudes from the support surface;
The electromagnetic relay according to any one of claims 1 to 6. The fixed terminal is
a first plate portion extending in the second direction;
a second plate portion extending in the first direction from the first plate portion;
a third plate portion extending from the first plate portion in the first direction and arranged apart from the second plate portion in the second direction;
including
The groove extends through the first plate portion in the second direction,
The electromagnetic relay according to any one of claims 1 to 7. The fixed terminal has a columnar shape including a circular bottom surface and a curved side surface,
The concave groove is arranged on the circular bottom surface and extends to the curved side surface,
The electromagnetic relay according to any one of claims 1 to 7. the fixed terminal includes a linear plate portion extending in a third direction intersecting the first direction and the second direction;
The groove extends through the linear plate portion in the second direction,
The electromagnetic relay according to any one of claims 1 to 7.

Images