JP2000299045A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut off an arc generated between a moving contact point and a fixed contact point by fixedly arranging an L-shaped permanent magnet on a case astride the back of a moving contact piece or a fixed contact piece and above the fixed contact point or the moving contact point. SOLUTION: When a coil 5 is excited from a coil exciting terminal 6, an armature 7 is rotated CCW around the upper end edge of an L-shaped yoke 4 against a damping spring 17, a moving contact piece 9 is moved toward a fixed contact piece 12, and a moving contact point 10 is brought into contact with a fixed contact point 13. When energization is stopped, the moving contact point 10 is separated from the fixed contact point 13 by the elastic restoring force of the moving contact piece 9, then an arc is generated. When an L-shaped permanent magnet 16 is arranged astride the back of the upper section of the moving contact piece 9 and above the moving contact point 10 or the fixed contact point 13, the magnetic flux passes in the transverse direction between the moving contact point 10 and the fixed contact point 13, and the arc is diffused in the direction perpendicular to it and is extinguished. Since the permanent magnet 16 is L-shaped, the magnetic flux path is short, and the diffusing force of the arc is strong.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay configured such that an arc generated when a movable contact and a fixed contact separate from each other is interrupted by a permanent magnet.

[0002]

2. Description of the Related Art Conventionally, in this type of electromagnetic relay, an I-shaped plate-shaped permanent magnet is fixedly disposed on a case above a movable contact and a fixed contact, behind a movable contact, or behind a fixed contact. I have.

[0003]

SUMMARY OF THE INVENTION As described above, the known I
When a permanent magnet is used, the magnetic flux path between the movable contact and the fixed contact becomes longer, and there is a disadvantage that the force for diffusing the arc is weak.

[0004]

According to the present invention, an L-shaped permanent magnet is fixed to a case across a movable contact or a fixed contact and a fixed contact or above a movable contact. It is solved by arranging.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment with reference to FIGS. In the drawings, components having the same function will be described with the same reference numerals.

In FIG. 1, reference numeral 1 denotes an electromagnetic relay;
Is a plastic pace, and the plastic base 2 has a coil bobbin head 3 formed integrally with the coil bobbin. An iron core is provided in a center hole of a coil bobbin not shown, and a lower portion of the iron core is connected to an L-shaped yoke 4. The coil 5 is provided on the coil bobbin. Reference numeral 6 denotes a power supply terminal of the coil 5. Another one
The two coil feeding terminals are provided behind the terminal 6.
Reference numeral 7 denotes a substantially L-shaped armature having a bent portion formed at an obtuse angle, and is swingably supported by the outer edge at the upper end of the L-shaped yoke 4. Reference numeral 8 denotes a card fixed to the armature.

Reference numeral 9 denotes a movable contact piece standing upright on a plastic base, reference numeral 10 denotes a movable contact provided on the movable contact piece, and reference numeral 11 denotes a lead terminal of the movable contact piece. The movable contact piece 9 is connected to the armature 7 by a card 8. 12
Is a fixed contact, 13 is a fixed contact provided on the fixed contact, and 14 is a lead terminal of the fixed contact. Reference numeral 15 denotes a plastic case, which is fixed to the base 2. Reference numeral 16 denotes an L-shaped permanent magnet fixedly disposed on the plastic case 15.

As shown in the figure, the permanent magnet 16 is provided so as to straddle behind the upper portion of the movable contact piece 9 and above the movable contact or the fixed contact in order to cut off an arc generated when the movable contact is separated from the fixed contact. Can be Reference numeral 17 denotes a braking spring for braking the swinging movement of the armature so that the armature 7 does not fly out due to an impact or the like. One end of the braking spring is fixed to the bobbin head 3.

In the electromagnetic relay 1 configured as described above, when the coil 5 is energized from the terminal 6 of the coil 5 and the coil is excited, the iron core provided in the coil 5 is magnetized to make an L-shaped contact. To attract the pole element 7, the armature 7
It pivots counterclockwise around the upper edge of the L-shaped yoke against the armature braking spring, moves the movable contact 9 via the card 8 toward the fixed contact 12, and moves the movable contact 10 thereof.
The fixed contact 13 is brought into press contact.

When the energization of the coil 5 is stopped, the iron core is demagnetized, and the elastic restoring force of the movable contact piece 9 causes the armature 7 to move from the position where the armature 7 is attracted to the iron core via the card 8. Return to the initial position. At this time, an L-shaped permanent magnet acts to eliminate an arc generated when the movable contact moves away from the fixed contact. That is, according to the present invention, since the magnetic flux is disposed between the back of the movable contact piece and above the movable contact or the fixed contact, the magnetic flux exiting from the N pole of the L-shaped magnet and entering the S pole is: The arc passing through the movable contact 10 and the fixed contact 13 in a direction transverse to the movable contact 10 and the fixed contact 13 is diffused in a direction perpendicular to the drawing plane and extinguished. In this case, in the present invention, unlike the case of the conventional I-shaped permanent magnet, the N-pole S
The magnetic flux path between the poles is shortened, and the power for diffusing the arc is strong.
In addition, the effect of the electromagnetic relay on other magnetic circuits is reduced.

FIG. 2 shows another embodiment of the electromagnetic relay of the present invention. The only difference from FIG. 1 is the location of the L-shaped permanent magnet. In this case, the L-shaped permanent magnet 1
Numeral 6 is fixedly disposed on the plastic case so as to extend between the upper part of the fixed contact piece 12 and the upper part of the movable contact or the fixed contact. The arc breaking action is exactly the same as in FIG.

[0012]

According to the present invention, by using an L-shaped permanent magnet to interrupt an arc generated between the movable contact and the fixed contact, the magnetic flux emitted from the N pole of the permanent magnet is transmitted to the movable contact. Since the magnetic flux enters the S pole with a short magnetic flux path length across the fixed contacts, there is an advantage that the arc diffusing force is strong and does not affect other magnetic circuits of the electromagnetic relay.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an embodiment of the electromagnetic relay of the present invention.

FIG. 2 is a partially cutaway side view of another embodiment of the electromagnetic relay of the present invention.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic relay 2 plastic base 3 bobbin head 4 L-shaped yoke 5 coil 6 coil feeding terminal 7 armature 8 card 9 movable contact piece 10 movable contact 11 lead terminal 12 fixed contact piece 13 fixed contact 14 lead terminal 15 plastic case 16L -Shaped permanent magnet 17 braking spring

Claims (1)

[Claims] 1. An L-shaped permanent magnet for interrupting an arc is fixedly disposed on a case so as to straddle between a movable contact or a fixed contact and a position between a fixed contact and a movable contact. An electromagnetic relay characterized by the following.