JPH1140029A - Relay with permanent magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contorl the direction of an arc so as to prevent a card or the like from being damaged by the arc by installing a permanent magnet between the back face of a moving contact strip and a armature so that the magnetic lines of force of the permanent magnet pass between a fixed contact and a moving contact and form a loop magnetic field surrounding the moving contact and the armature. SOLUTION: A permanent magnet 21 is installed between the back of a moving contact piece 13 and an armature 7 and above a card 14; moreover, this permanent magnet 21 is so paced that the magnetic lines of force generated from the permanent magnet 21 pass between a moving contact 12 and a fixed contact 10 and thereafter, pass the permanent magnet 21 and the inside surface of a permanent magnet-carrying relay 1 and then surround the back of the armature 7. Thereby, the arc generated between the contacts can be forcibly scattered in all directions and can be cut off even if the flowing direction of the current is changed because the force acting on the arc is not changed. In addition, the magnetic lines of force generated from the permanent magnet 21 can enhance the attraction action of the armature 7 to a core 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet-equipped relay, and more particularly to an improvement of a permanent magnet-equipped relay configured to interrupt an arc generated between a fixed contact and a movable contact by a permanent magnet. Things.

[0002]

2. Description of the Related Art FIG.
A description will be given with reference to FIG. In FIG. 6, a solenoid actuator 2 has a bobbin 5 in which a core 3 is inserted at the center and a coil 4 is wound, and a yoke 6 is disposed on a side of the bobbin 5 so that the bobbin 5 is disposed. The bobbin 5 is fixed to the yoke 6. Also, L is attached to the upper end of the yoke 6.
A bent portion of the armature 7 bent in a character shape is abutted and rotatably supported.

When the coil 4 is energized, the core 3
Are excited, the upper end of the armature 7 is attracted to the core 3, and when the power supply is stopped, the core 3 is demagnetized and the armature 7 is separated from the upper end of the core 3.

On the other hand, in FIG. 1, a pair of relay circuits 8 are arranged such that a fixed contact piece 11 provided with a fixed contact 10 on a base plate 9 and a movable contact piece 13 provided with a movable contact 12 are arranged in parallel. It is erected.

A card 14 made of a hard resin is disposed between the relay circuit 8 and the solenoid actuator 2, and the lower end of the card 14 is pivotally supported by a support provided on the base plate 9 to rotate. It is erected freely, and
A lower rear portion of the card 14 is in contact with a lower end portion of the armature 7, and a projecting piece 14 a protruding from a front surface of an upper portion of the card 14 is attached to a rear surface of the movable contact 12. Further, as shown in FIG. 7, a permanent magnet 15 is provided between the two sets of contacts and parallel to the moving direction of the movable contact pieces 13, 13.

When the coil 4 is energized, the core 3
Is excited, and the upper end of the armature 7 is attracted to the core 3 and pivoted to rotate the card 14,
The card 14 presses the movable contact piece 13 to move the movable contact 1.
2 contacts the fixed contact 10. When the power supply is stopped, the core 3 is demagnetized, and as shown in FIG.
The movable contact piece 13, the card 14, and the armature 7 return to the initial position by the elastic restoring force.

As shown in FIGS. 7 and 8, a magnetic line of force 16 generated from the permanent magnet 15 is directed in a direction transverse to the space between the fixed contact 10 and the movable contact 12, and the line of magnetic force 16 is fixed between the fixed contact 10 and the movable contact 12. When the arc 17 is generated, a force F is generated by Fleming's left-hand rule, and the arc 17 is scattered in the vertical direction.

[0008]

The conventional relay 1 with a permanent magnet includes a fixed contact 10 and a movable contact by a magnetic line 16 generated from a permanent magnet 15 disposed between two pairs of contacts in the relay 1 with a permanent magnet. Arc 1 generated between 12
7 can be disrupted. However, when the direction of the magnetic force lines 16 or the current is reversed, the direction of the force F generated by Fleming's left-hand rule is also reversed.
The direction of scattering of the card 1 is also reversed, and it is turned downward in FIG.
4 may be damaged. When the card 14 is damaged as described above, the function of the card 14 is reduced, and the action of connecting and disconnecting the movable contact 12 and the fixed contact 10 is hindered.

Therefore, in the relay 1 with permanent magnet, the direction of the arc 17 is controlled to prevent damage to a card or the like by the arc 17 as much as possible, and at the same time, the action of attracting the armature to the core is promoted. A technical problem to be solved arises in order to improve the function of the relay with a permanent magnet, and the present invention aims to solve the problem.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and comprises a fixed contact provided with fixed contacts on a base plate, and a movable contact provided with movable contacts on a base plate. A pair of relay circuits which stand in parallel with each other and are formed so as to open and close the relay circuit by connecting a solenoid actuator to the movable contact piece of the relay circuit, and the fixed contact And a permanent magnet provided with a permanent magnet for interrupting an arc generated between the movable contact and the movable contact, wherein a permanent magnet is provided between the back surface of the movable contact piece and the amateur, Are provided so that the magnetic field lines pass through between the fixed contact and the movable contact to form a loop magnetic field surrounding the movable contact and the armature.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of explanation, the same reference numerals are used for the same components as those in the related art.

In FIG. 1, 1 is a relay with a permanent magnet,
A solenoid actuator 2 is provided on the right side of the relay 1 with a permanent magnet in the drawing. The solenoid actuator 2 is provided with a bobbin 5 in which a core 3 is inserted and a coil 4 is wound at a center portion, and a yoke 6 is disposed on a side portion of the bobbin 5. 5 is fixed. A bent portion of an armature 7 that is bent in an L-shape is in contact with the upper end of the yoke 6 and is rotatably supported.

On the other hand, in FIG. 1, a pair of relay circuits 8 are arranged such that a fixed contact piece 11 provided with a fixed contact 10 on a base plate 9 and a movable contact piece 13 provided with a movable contact 12 are opposed to and parallel to each other. It is erected.

The movable contact piece 13 and the armature 7
A card 14 made of a hard resin is disposed between the card and the card 14. The lower end of the card 14 is pivotally supported by a support provided on the base plate 9 and is rotatably erected. 14
The lower rear portion of the card 14 abuts against the lower end portion of the amateur 7 and the projecting piece 14 protrudes from the upper front surface of the card 14.
a is attached to the back of the movable contact 12.

On the other hand, a permanent magnet 21 is disposed between the rear surface of the movable contact piece 13 and the armature 7 and above the card 14, and the permanent magnet 21 is arranged as shown in FIG. As shown in FIG.
2 passes between the movable contact 12 and the fixed contact 10 and then passes through the permanent magnet 21 and the inner surface of the permanent magnet-equipped relay 20 to surround the rear part of the amateur. ing.

Thus, when the coil 4 is energized, the core 3 is excited, and as shown in FIG. 3A, the upper end of the armature 7 is attracted to the core 3 and at the same time, The lower part turns to the left in FIG. Therefore, the movable contact piece 1 attached to the card 14
3, the movable contact 12 provided on the movable contact piece 13 comes into contact with the fixed contact 10 facing the movable contact piece 13. When the energization of the coil 4 is stopped, the movable contact 12 separates from the fixed contact 10 and returns to the upright state by the elastic restoring force of the movable contact piece 13 as shown in FIG. At this time, the card 14 attached to the movable contact piece 13 is pressed rightward in the figure, and in conjunction with this operation, the lower part of the armature 7 rotates rightward in the figure, Therefore, the upper end of the armature 7 is separated from the core 3.

As shown in FIG. 2, when an arc 23 is generated from the fixed contact 10 toward the movable contact 12 when the fixed contact 10 and the movable contact 12 are connected or disconnected, as shown in FIG. ), A force F is generated in a direction orthogonal to the arc 23 by the Fleming's left-hand rule.
3 are scattered in the direction of the force F. However, even if the direction of current flow changes, the direction of the force F acting on the arc 23 does not change, so that the arc 23 can be scattered reliably. Therefore, the arc 23 generated between the contacts does not damage the card 14 made of the hard resin.
In addition, since there is no welding between the contacts, the attraction between the contacts is promoted.

The location of the permanent magnet 21 is not limited to between the movable contact 12 and the armature 7, and as shown in FIGS. 4 and 5, in addition to the permanent magnet 21, The permanent magnet 24 may be disposed behind the fixed contact piece 11 with the same pole as the permanent magnet 21. In such a case, the lines of magnetic force 22 generated from the permanent magnet 21 and the permanent magnet 24 repel each other between the contacts and generate a stronger magnetic field, so that the arc 23 generated between the contacts is effectively scattered. Can be.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0020]

According to the present invention, as described in detail in the first embodiment, the permanent magnet is disposed between the movable contact piece and the armature. In this way, the lines of magnetic force generated from the permanent magnet pass between the fixed contact and the movable contact and surround the movable contact and the amateur, so that the arc generated between the contacts can be forcibly scattered in all directions. At the same time, even if the direction in which the current flows changes, the force acting on the arc does not change, so that the arc can be reliably cut off. Further, the magnetic lines of force generated from the permanent magnet can assist the attraction of the armature to the core, and the function of the relay with the permanent magnet and the reliability of the relay with the permanent magnet are improved. It is an invention that has an advantageous effect.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a relay with a permanent magnet according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of a relay with a permanent magnet.

FIG. 3 (a) is a partially cutaway side view showing a state where power is supplied to a relay with a permanent magnet. (B) Partly cut-away side view showing a state in which energization of a relay with a permanent magnet is stopped.

FIG. 4 is a partially cutaway plan view of a relay with permanent magnets in which two permanent magnets are arranged.

FIG. 5 is a partially cutaway side view of a permanent magnet-equipped relay provided with two permanent magnets.

FIG. 6 is a partially cutaway side view showing a conventional relay with a permanent magnet.

FIG. 7 is a partially cutaway plan view of a conventional relay with a permanent magnet.

FIG. 8 is a partially cutaway side view of a conventional relay with a permanent magnet.

[Explanation of symbols]

 2 Solenoid actuator 7 Amateur 8 Relay circuit 13 Movable contact piece 14 Card 14a Projection piece 20 Relay with permanent magnet 21 Permanent magnet 22 Magnetic field line 23 Arc 24 Permanent magnet F force

Claims (1)

[Claims] 1. A pair of relay circuits comprising a fixed contact piece provided with a fixed contact and a movable contact piece provided with a movable contact, which stand on a base plate in parallel to face each other. A permanent actuator which is formed so as to open and close the relay circuit by connecting a solenoid actuator to the movable contact piece of the circuit, and is provided with a permanent magnet for interrupting an arc generated between the fixed contact and the movable contact. In the relay with magnets, a permanent magnet is disposed between the rear surface of the movable contact piece and the armature, and the magnetic field lines of the permanent magnet pass between the fixed contact and the movable contact, and the armature is connected to the armature. Characterized in that it is configured to form a loop magnetic field surrounding the relay.