JP4181269B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a base, a movable contact piece and a fixed contact piece erected opposite to each other on the base, a movable contact provided on the movable contact piece, and a fixed contact provided on the fixed contact piece. And an electromagnetic relay having an L- shaped permanent magnet for interrupting an arc . The electromagnetic relay includes a case that is fixed to the base and covers the movable contact piece and the fixed contact piece .
[0002]
[Prior art]
Conventionally, in this type of electromagnetic relay, an I-shaped plate-like permanent magnet is fixed to a case above the movable contact and the fixed contact, behind the movable contact, or behind the fixed contact.
[0003]
[Problems to be solved by the invention]
When the known I-shaped permanent magnet as described above is used, the magnetic flux path passing between the movable contact and the fixed contact becomes long, and there is a drawback that the force for diffusing the arc is weak.
[0004]
[Means for Solving the Problems]
According to the present invention, the above-described problems are provided on the base, the movable contact piece and the fixed contact piece that are erected opposite to each other, the movable contact provided on the movable contact piece, and the fixed contact piece. In an electromagnetic relay comprising a fixed contact and a case fixed to the base and covering the movable contact piece and the fixed contact piece,
An L-shaped permanent magnet for interrupting the arc is fixedly disposed on the case across the movable contact piece and the fixed contact or above the movable contact.
Or
The L-shaped permanent magnet for interrupting the arc is fixed by being arranged in the case across the back of the fixed contact piece and the fixed contact or the movable contact. .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in detail with reference to FIGS. 1 and 2 based on an embodiment. In the drawings, components having the same functions are described with the same reference numerals.
[0006]
In Figure 1, 1 is an electromagnetic relay, 2 is a plastic base over scan, the plastic base 2 has a coil bobbin head 3 which is molded in the coil bobbin and integrally. An iron core is disposed in a central hole of a coil bobbin (not shown), and the lower part of the iron core is connected to an L-shaped yoke 4. A coil 5 is provided on the coil bobbin. Reference numeral 6 denotes a power supply terminal of the coil 5. Another coil power supply terminal is 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 supported on the outer edge of the upper end of the L-shaped yoke 4 so as to be swingable. 8 is a card fixed to the armature.
[0007]
9 is a movable contact piece standing on the plastic base, 10 is a movable contact point provided on the movable contact piece, and 11 is 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 piece, 13 is a fixed contact provided on the fixed contact piece, and 14 is a lead terminal of the fixed contact piece. A plastic case 15 is fixed to the base 2. Reference numeral 16 denotes an L-shaped permanent magnet fixed to the plastic case 15.
[0008]
As shown in the drawing, the permanent magnet 16 is provided so as to straddle the back of the upper part of the movable contact piece 9 and the movable contact or the fixed contact in order to interrupt an arc generated when the movable contact is separated from the fixed contact. Reference numeral 17 denotes a braking spring that brakes the swinging movement of the armature so that the armature 7 does not jump out due to an impact or the like. One end of the spring is fixed to the bobbin head 3.
[0009]
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 and the L-shaped armature 7 is attached. In order to attract, the armature 7 pivots counterclockwise around the upper edge of the L-shaped yoke against the armature brake spring and moves the movable armature 9 toward the fixed armature 12 via the card 8. The movable contact 10 is brought into press contact with the fixed contact 13.
[0010]
When the energization of the coil 5 is stopped, the iron core is demagnetized, and the armature 7 is moved from the position where the armature 7 is attracted to the iron core to the original initial position via the card 8 by the elastic restoring force of the movable armature 9. Return to. At this time, an L-shaped permanent magnet acts in order to eliminate the arc generated when the movable contact leaves the fixed contact. In other words, according to the present invention, the magnetic flux is arranged between the back of the movable contact piece and the upper part of the movable contact or the fixed contact. The arc between the movable contact 10 and the fixed contact 13 is diffused in the direction perpendicular to the drawing plane and extinguished. In this case, since the L-shaped permanent magnet is used in the present invention, the magnetic flux path between the N pole and the S pole is shortened and the force for diffusing the arc is strong unlike the case of the conventional I-shaped permanent magnet. In addition, the influence of the electromagnetic relay on other magnetic circuits is reduced.
[0011]
FIG. 2 shows another embodiment of the electromagnetic relay of the present invention. The only difference from FIG. 1 is the arrangement position of the L-shaped permanent magnet. In this case, the L-shaped permanent magnet 16 is fixedly disposed on the plastic case across the back of the upper portion of the fixed contact piece 12 and the upper side of the movable contact or the fixed contact. The arc blocking action is exactly the same as in FIG.
[0012]
【The invention's effect】
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 generated from the N pole of the permanent magnet crosses between the movable contact and the fixed contact. Thus, since the S pole is entered with a short magnetic flux path length, there is an advantage that the arc diffusing force is strong and other magnetic circuits of the electromagnetic relay are not affected.
[Brief description of the drawings]
FIG. 1 is a side view of a part of an embodiment of an electromagnetic relay according to the present invention.
FIG. 2 is a side view showing a part of another embodiment of the electromagnetic relay according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Plastic base 3 Bobbin head 4 L-shaped yoke 5 Coil 6 Coil feed terminal 7 Armature 8 Card 9 Movable contact 10 Movable contact 11 Lead terminal 12 Fixed contact 13 Fixed contact 14 Lead terminal 15 Plastic case 16 L Shaped permanent magnet 17 Brake spring

Claims (2)

A base, a movable contact piece and a fixed contact piece that are erected opposite to each other on the base, a movable contact provided on the movable contact piece, a fixed contact provided on the fixed contact piece, and the base In an electromagnetic relay comprising a case that is fixed and covers the movable contact piece and the fixed contact piece,
The permanent magnet of L-shaped for blocking the arc, and behind the movable contact piece, characterized by being arranged fixed to the casing across between the upper to the no fixed contact the movable contact Electromagnetic relay. A base, a movable contact piece and a fixed contact piece that are erected opposite to each other on the base, a movable contact provided on the movable contact piece, a fixed contact provided on the fixed contact piece, and the base In an electromagnetic relay comprising a case that is fixed and covers the movable contact piece and the fixed contact piece,
An L-shaped permanent magnet for interrupting the arc is fixedly disposed in the case across the back of the fixed contact piece and above the fixed contact or the movable contact. Electromagnetic relay.

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