JP2877170B2 - Electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an electromagnet comprising a fixed iron core on which a spool around which an electromagnetic coil is wound and a movable iron core disposed opposite to the fixed iron core. The present invention relates to an electromagnetic contactor that transmits a contact to a movable contact support via a lever to open and close a contact.

[0002]

2. Description of the Related Art FIG. 11 is a sectional view of a conventional electromagnetic contactor.
An electromagnet and a contact mechanism are housed inside the case 1.
This electromagnet has a fixed core 2 having E-shaped legs (left outer leg 2L, central leg 2C, right outer leg 2R), a spool 3 inserted into the central leg 2C of the fixed core 2, and a spool 3 wound around the spool. And an L-shaped movable iron core 5. The movable core 5 comprises a movable piece 5A disposed opposite to the tangent surface of the fixed core 2 and a drive piece 5B substantially perpendicular to the movable piece. A projection 5C is provided at the joint between the two pieces 5A and 5B. Are formed. The projection 5C engages with a U-shaped groove provided at the upper end of the right outer leg 2R of the electromagnet, and
It forms the pivot point of the movable iron core. In this electromagnetic contactor, when a current flows from the coil terminal 6 to the electromagnetic coil 4, the stationary core 2 is excited to generate an attractive force, and attracts the movable piece 5 </ b> A of the L-shaped movable core 5 (the movable piece 5 </ b> A in this state).
Is indicated by a chain line). As a result, the L-shaped movable iron core 5 rotates counterclockwise about the engagement protrusion 5C.
Due to this rotation, the driving piece 5B of the movable core 5 pushes the movable contact support 7 to the left, and the movable contact 8 contacts the fixed contact 9.
When the energization of the electromagnetic coil 4 is stopped, the attracting force from the fixed iron core 2 disappears, and the movable contact support 7 becomes a return spring 1
It moves to the right by a spring force of zero. By this movement, the movable contact 8 is released from the fixed contact 9 and the driving piece 5B
Is also pushed rightward, whereby the movable iron core 5 is
The movable piece 5A rotates clockwise around the fulcrum C and returns to a state in which the left end of the movable piece 5A contacts the insulating plate 11, that is, the position shown in FIG.

[0003]

In the electromagnet of this electromagnetic contactor, the movable iron core 5 itself constitutes an L-shaped lever, and the projection 5C of the flat movable piece has an upper end on the right outer leg 2R of the fixed iron core 2. And it rotates in a cantilever manner with the fulcrum as a fulcrum. By the way, in such an electromagnet, in general, there is a relation that the attractive force between the fixed core and the movable piece is inversely proportional to the square of the distance between the movable piece and the contact surface of the fixed iron core. That is, in this case, the suction force of each leg of the E-shaped fixed iron core 2 is large in the leg 2R, but significantly reduced in the leg 2L. In addition, since the rotational force of the movable piece is the product of the suction force and the distance from the fulcrum to the point of application, the total force is extremely small. Therefore, if the stroke between the movable piece and the contact surface of the fixed core is increased, the suction force between the fixed iron core and the movable piece is reduced, so that the stroke cannot be made too large.
On the other hand, if the stroke is reduced, the suction force increases, but the stroke of the driving piece decreases, and there is a problem that a sufficient stroke for driving the movable contact support cannot be obtained. Furthermore, in the structure of this movable piece, only the protrusion is engaged with the U-groove at the upper end of the upper right outer leg of the fixed iron core, so that the fulcrum part is displaced when rotating the movable iron core, and the movable contact support is driven. Operating characteristics become unstable, and the switching operation between the fixed contact and the movable contact becomes uncertain.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to provide a large attractive force to the movable iron core, to drive the movable contact support with a large force, and to obtain a sufficient stroke for driving the movable contact support. An object of the present invention is to provide an electromagnetic contactor capable of reliably performing an opening and closing operation between a contact and a movable contact and a coupling mechanism of an L-shaped lever thereof.

[0005]

According to the present invention, in order to achieve the above-mentioned object, a fixed core constituted as an E-shaped core having three legs, an electromagnetic coil wound and mounted on a center leg of the fixed core are provided. Spool and the same shape as the fixed iron core, and each of the three
An electromagnetic contactor that includes an electromagnet including a movable iron core with its leg ends opposed to each other, and transmits the movement of the movable iron core to a movable contact support via an L-shaped lever to open and close the contact. A lever is rotatably connected to the spool, and this connecting portion is used as a rotation fulcrum of the L-shaped lever, and the movable iron core is rotatably connected to the tip of the L-shaped lever, and In the non-excited state, the movable core was arranged to be inclined with respect to the fixed core. Further, in such a configuration, the connection between the L-shaped lever and the spool is provided by providing a flange portion at the upper portion of the spool, providing a fulcrum hole having a notch in the collar portion, and providing a bent end surface or a parallel cutting side surface at the bending portion of the L-shaped lever. A fulcrum pin having a boss is projected, and the fulcrum pin is fitted into the spool-side fulcrum hole.

[0006]

According to the structure of the present invention, the fixed iron core is formed as an E-shaped iron core having three legs, and the movable iron core is formed in the same shape as the fixed iron core. Are arranged facing each other to form an electromagnet, so that when the electromagnetic coil wound around the spool mounted on the fixed iron core is energized, the movable iron core moves up and down by a force acting between the movable iron core and the fixed iron core. Moreover, in this case, the distance between the contact surface of the fixed iron core and the contact surface of the movable iron core is substantially the same over the three legs, so that the force acting between the movable core and the fixed iron is three times the force acting on each leg. Double. Furthermore, since the fulcrum of the L-shaped lever is fixedly provided on the spool, the fulcrum is displaced by the movement of the L-shaped lever, and the operation characteristic of driving the movable contact support becomes unstable, and the opening / closing operation between the fixed contact and the movable contact is uncertain. It never happens.

[0007]

FIG. 1 is a cross-sectional view of an electromagnetic contactor according to an embodiment of the present invention. This embodiment differs from the conventional example in the structure of the movable iron core of the electromagnet and the coupling mechanism of the L-shaped lever. That is, the movable iron core 12 has E-shaped legs (left outer leg 2L, middle push leg 2L).
C, the right outer leg 2R) is formed in the same shape as the fixed core 2 having the right outer leg 2R. This vertical movement is transmitted to the movable contact support 7 by an L-shaped lever 15. The L-shaped lever 15 has a pin from a portion serving as a fulcrum inserted into a fulcrum hole 14 provided at the upper right end of the spool 3. Are installed so as to be rotatable around this point. The L-shaped lever 15 has one end separated by a length L2 from a portion serving as a fulcrum, and is connected by a center pin 13 at a connecting portion of a tripod of the movable iron core 2. Is configured to hit the right side. A curved terminal 16 is provided so as to surround the fulcrum hole 14 at the upper right end of the spool 3.
And one end thereof is connected to the electromagnetic coil 4, and the curved terminal 16 is in contact with the coil terminal 6. When a current from the coil terminal 6 flows through the curved terminal 16 to the electromagnetic coil 4, the fixed core 2 is excited to generate an attractive force, and the movable iron core 12 is attracted and moves downward. This movement is caused by an L-shaped lever 15 connected to the movable iron core 12 by a pin 13.
L-shaped lever 15 is transmitted to the fulcrum hole 14 of the spool 3.
, And the movable contact support 7 is pushed leftward at the other end of the L-shaped lever 15 to open and close the contact between the movable contact 8 and the fixed contact 9. When the power supply to the electromagnetic coil 4 is stopped, the attracting force from the fixed iron core 2 disappears, the movable iron core 12 is not attracted, and the movable contact support 7 moves rightward by the spring force of the return spring 10. By this movement, the movable contact 8 is released from the fixed contact 9 and the other end of the L-shaped lever 15 is also pushed rightward, whereby the L-shaped lever 15 rotates clockwise about the fulcrum hole 14 as a fulcrum. The movable core 12 connected to one end of the L-shaped lever 15 is pulled upward (the state shown in FIG. 1). The structure and assembly of the L-shaped lever 15 will be described later in detail.

FIG. 2 is a cross-sectional view of an electromagnetic contactor according to another embodiment of the present invention. This embodiment differs from the embodiment shown in FIG. 1 in that a convex portion 17 is provided on the back surface of the L-shaped lever 15. By providing the protrusions 17 (at least one or more), the tip of the movable core 12 and the fixed core 2 has an angle of θ. This angle θ is an angle at which the movable iron core 12 comes into complete contact with the fixed iron core 2 at the time of suction and enters the suction state.
When the angle θ is formed, the movable core 1
2 and the position of the fixed iron core 2 can be kept constant, and the variation of the suction voltage due to the mounting state of the movable iron core 12 and the vibration at the time of suction can be reduced.

FIG. 3 is a perspective view for explaining the structure of the L-shaped lever 15 and the process of assembling the movable iron core 12 and the L-shaped lever 15. The L-shaped lever 15 is configured such that two L-shaped pieces face each other in parallel, and are connected by connecting pieces. A projecting portion is provided at the connecting portion of the L-shaped piece, and a fulcrum hole 19 is formed here. Movable iron core 12
In order to connect the L-shaped lever 15 to the
The connection hole 18 at the end of the length L2 of the L-shaped lever 15 is aligned with the connection hole 17A, and the connection pin 13 is inserted into the connection hole 18 for connection. In this state, the two fulcrum holes 19 of the L-shaped lever 15 are inserted between the two brim portions Q of the spool 3 shown in FIG. 4, and the fulcrum pins 20 are inserted and attached thereto. An electromagnetic coil is wound around the point indicated by the arrow P in FIG. 4, and its terminal is connected to the curved terminal 16, but is not shown here.

FIG. 5 is a perspective view for explaining an assembling process different from that of FIG. 3, and FIG. 6 is a side view thereof. The L-shaped lever 15 has an inclined end face 22 having an angle of α at a fulcrum.
The fulcrum pin 21 having the
The notch 23 is provided in the fulcrum hole 14 of FIG. At the time of assembling, the portion serving as the fulcrum of the L-shaped lever 15 is pressed into the flange portion Q of the spool 3 from the direction of the arrow, so that the flange portion Q expands to both outsides in the Q1 direction, and the notch 23 expands in the Q2 direction. The fulcrum pin 21 is fitted into the fulcrum hole 14 (FIG. 7).

FIG. 8 is a perspective view for explaining still another assembling process, and FIG. 9 is a side view thereof. A fulcrum pin 24 having a parallel cutting side surface 25 is projected from a portion serving as a fulcrum of the L-shaped lever 15. With fulcrum hole 1 of spool 3
4, a notch 23 is provided. When assembling, the fulcrum portion of the L-shaped lever 15 is inserted into the two flange portions Q of the spool 3 from the direction of the arrow, and the parallel fulcrum 25 of the fulcrum pin 24 is aligned with the notch 23, and the fulcrum pin 24 is inserted into the fulcrum hole 14 Then, the L-shaped lever is turned counterclockwise to mount (FIG. 10).

[0012]

According to the present invention, the movable core of the electromagnet is
An E-shaped iron core having the same shape as the fixed iron core having the U-shaped legs,
Since the direction of movement is the up and down direction, a large suction force can be obtained for the same stroke, and this suction force is transmitted to the movable contact support via the L-shaped lever connected to the movable iron core, so that the contacts can be opened and closed. Performance is improved. In addition, the L-shaped lever is provided with a convex portion to hold the movable core and the fixed core at a constant angle Q, so that vibrations and shocks generated at the time of suction due to the mounting state of the movable core and the like are reduced, and variations in the suction voltage are reduced. it can. Further, since the fulcrum of the L-shaped lever is formed by inserting a pin into a fulcrum hole provided in the spool, the fulcrum is not displaced and a stable operation can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic contactor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an electromagnetic contactor according to another embodiment of the present invention.

FIG. 3 is a perspective view for explaining an assembling process of a movable iron core and an L-shaped lever.

FIG. 4 is a perspective view of a spool.

FIG. 5 is a perspective view for explaining an assembling process different from FIG. 3;

FIG. 6 is a side view of a main part of FIG. 5;

7 is a side view showing a state where the L-shaped lever and the spool in the state shown in FIG. 6 are assembled.

FIG. 8 is a perspective view for explaining an assembling process different from FIGS. 3 and 5;

9 is a side view of a main part of FIG. 8;

10 is a side view showing a state where the L-shaped lever and the spool in the state shown in FIG. 9 are assembled.

FIG. 11 is a sectional view of a conventional electromagnetic contactor.

[Explanation of symbols]

 Reference Signs List 2 fixed iron core 3 spool 4 electromagnetic coil 12 movable iron core 14 fulcrum hole 15 L-shaped lever 17 convex part 20 fulcrum pin 21 fulcrum pin 22 inclined end face 23 notch part 24 fulcrum pin 25 parallel cutting side surface

Claims (3)

(57) [Claims] 1. A fixed core constituted as an E-shaped core having three legs, a spool wound with an electromagnetic coil and mounted on a central leg of the fixed core, and formed in the same shape as the fixed core. An electromagnet comprising a movable iron core with its three legs opposed to the fixed iron core, and the movement of the movable iron core of the electromagnet is transmitted to a movable contact support via an L-shaped lever to contact the contact. In the electromagnetic contactor that is driven to open and close, the L-shaped lever is rotatably connected to the spool, and this connection portion is used as a rotation fulcrum of the L-shaped lever, and the movable iron core is turned around the tip of the L-shaped lever. An electromagnetic contactor characterized by being movably connected and having a movable core inclined with respect to a fixed core when the electromagnetic coil is not excited. 2. An L-shaped lever according to claim 1, wherein said L-shaped lever is connected to said spool by providing a collar at an upper portion of said spool, providing a fulcrum hole having a notch in said collar, and bending said L-shaped lever. An electromagnetic contactor is provided by projecting a fulcrum pin having an inclined end face at a portion thereof and fitting the fulcrum pin into the spool-side fulcrum hole. 3. An L-shaped lever according to claim 1, wherein said L-shaped lever is connected to said spool by providing a flange at an upper portion of said spool, providing a fulcrum hole having a notch at said flange, and bending said L-shaped lever. An electromagnetic contactor, wherein a fulcrum pin having a parallel cutting side face is protruded from a portion thereof, and the fulcrum pin is fitted into the spool-side fulcrum hole.