JPH07254341A - Electromagnetic contactor - Google Patents

Abstract

PURPOSE:To easily check a wire break in the electromagnetic coil of an electromagnetic contactor having a polarized electromagnet device. CONSTITUTION:Regarding a polarized electromagnetic device, it is known that a change takes place in the direction of the flux of a permanent magnet passing an electromagnetic coil, when the moving block of a contact mechanism is manually operated. In view of this fact, an operation indication piece 2 exposed from the case of an electromagnetic contactor 1 for a bearing to hold the moving contact of a contact mechanism is manually operated and the moving block is thereby shifted. On the other hand, the terminal of an operation display indicator lamp 2 with a resistor R, a light emission element LED, a diode D connected in series is connected to the coil terminals A1 and A2 of the electromagnetic coil 14 of the electromagnetic contactor 1 and the element LED is made to emit light instantaneously, upon exposure to the voltage induced in the electromagnetic coil. Then, a wire break in the coil 14 is checked by observing whether the element LED emits light, when the operation indication piece 2 for the bearing is manually operated to shift the moving block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor using a polar electromagnet device that drives a movable block by a combined attractive force of a permanent magnet and an electromagnetic coil.

[0002]

2. Description of the Related Art A conventional technique of this type is shown in FIGS. FIG. 5 shows a polarized electromagnet device, which includes an outer yoke 11, a permanent magnet 12, an inner yoke 13, an electromagnetic coil 14, a plunger 15, armatures 16 and 17, a non-magnetic plate 18.
Consists of. The non-magnetic plate 18 is a pair of outer yokes (first magnetic piece).
They are attached to the insides of the two leg pieces 11b of 11, respectively. The other magnetic pole surface (S pole side) of the permanent magnet 12 is brought into contact with the end of the central piece 13a of the inner yoke (second magnetic piece) 13, and the leg pieces 13b of the inner yoke 13 are armature (fourth magnetic piece). Placed against the 17. The plunger (movable magnetic pole bar) 15 and the armatures 16 and 17 constitute a movable block. With the above structure, the movable block is sequentially arranged between the suction side (X direction in FIG. 5) and the return side (Y direction in FIG. 5) between one leg piece 11b of the yoke 11 and the armature 16. The first magnetic gap E is between the leg piece 13b of the inner yoke 13 and the armature 17, and the second magnetic gap F is between the armature 16 and the other leg piece 11b of the outer yoke 11. Are formed respectively.

FIG. 6 shows an example in which the polarized electromagnet device shown in FIG. 5 is used in a high-sensitivity electromagnetic contactor, (A) showing a transverse sectional view and (B) showing a longitudinal sectional view. 6, the same elements as those of FIG. 5 are designated by the same reference numerals.
In FIG. 6, the high-sensitivity electromagnetic contactor is roughly composed of a contact mechanism part and a polarized electromagnet device part, and the contact mechanism part is the upper case 21.
In addition, the polarized electromagnet device section is housed in the lower case 22, both parts are connected by the lever 23, and the insulating plate 24
It is partitioned by.

The contact mechanism portion is provided with a support 25 which is connected to the lever 23. The support 25 has three movable contacts 26 and their contact springs 27 and one auxiliary when the main contact has three bends. A movable contact 28 and its contact spring 29 are provided. Further, a motion display piece 25a is integrally formed on the support 25 and a return spring 30 is attached. Fixed contact for contact between the movable contact 26 and the auxiliary movable contact 28
31 is stored in the upper case 21. Then, the load by the return spring 30 is constantly applied to the movable block in the X direction via the support 25 and the lever 23, and the movable block is in the return state. When the electromagnetic coil 14 is excited in this state, the plunger 15 moves to the right in FIG. 6 (A), and the support 25 moves to the left via the lever 23 to enter the closed state.

[0005]

In the electromagnetic contactor of this type, when checking the disconnection of the electromagnetic coil,
It is necessary to measure the resistance value of the electromagnetic coil with a tester or to apply a control circuit voltage between the coil terminals of the electromagnetic coil to check the operation, which requires a tester or test equipment and is troublesome. Have.

It is therefore an object of the present invention to provide an electromagnetic contactor which eliminates the above-mentioned drawbacks of the prior art and can easily check the disconnection of the electromagnetic coil.

[0007]

In order to achieve the above-mentioned object, the present invention drives a movable block, which is housed in a lower case and includes a plunger by a combined attractive force of an attractive force of a permanent magnet and an attractive force of an electromagnetic coil. A contact that holds a polarized electromagnet device and a movable contact housed in an upper case and arranged to face a fixed contact and that is slidable in the displacement direction of the plunger of the movable block of the polarized electromagnet device. A mechanism unit, a lever that connects one end of the plunger of the movable block of the polarized electromagnet apparatus and one end of the support of the contact mechanism unit, and transmits the displacement of the plunger of the movable block to the support, and the lever provided on the upper case. An electromagnetic field having a contact terminal having a fixed contact and a coil terminal of an electromagnetic coil, and an operation display piece provided on the support of the contact mechanism section being exposed from the upper case. The touch device has a series circuit of a light emitting element, a resistor, and a diode connected in series and a terminal piece connected to both ends of the series circuit and fixed to a coil terminal of the electromagnetic coil. An operation indicator lamp integrally formed as a unit is provided, and a terminal piece of the operation indicator lamp is coupled to a coil terminal of an electromagnetic coil by using a terminal screw.

[0008]

In the electromagnetic contactor according to the present invention, when the movable block of the polarized electromagnet device is manually operated, a voltage is induced in the electromagnetic coil by changing the direction of the magnetic flux passing through the electromagnetic coil emitted from the permanent magnet. The voltage induced in this electromagnetic coil is applied to the operation indicator lamp consisting of a light emitting element, a resistor, and a diode connected in parallel to the electromagnetic coil. Therefore, when the electromagnetic coil is not broken, the light emitting element of the operation indicator light instantaneously emits light, and when the electromagnetic coil is broken, the light emitting element of the operation indicator lamp does not emit light. The disconnection check can be performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is a circuit diagram of an electromagnetic contactor, and FIG. 2 is a perspective view of the electromagnetic contactor. In FIG. 1, 1 is an electromagnetic contactor, 2 is an operation indicator lamp, 3 is a contact portion, and 14 is an electromagnetic coil. To the coil terminals A1 and A2 of the electromagnetic coil 14, an operation indicator lamp 2 including a resistor R, a light emitting element LED, and a diode D is connected in parallel, and a surge absorbing element S including a varistor and a resistor is connected in parallel. The resistance R of the operation indicator lamp 2 is a resistor for limiting the current flowing through the light emitting element LED from several milliamperes to 10 milliamperes, and the diode D is a protection diode in the case of reverse connection and is a bidirectional light emitting element LED. It can be omitted when a sex product is used.
The surge absorbing element S absorbs a surge voltage generated from the electromagnetic coil 14.

As shown in FIG. 2, such an operation indicator lamp 2 has a series circuit composed of a resistor R, a light emitting element LED and a diode D, and two terminal pieces T1 connected to both ends of the series circuit. Molded together with T2 into a unit. This unitized operation indicator light 2 is a terminal piece T
Connect the terminal screws 1 and T2 to the coil terminals A1 and A2 of the electromagnetic contactor 1.
It is fixedly attached by means of this, whereby the operation indicator lamp 2 is connected to the electromagnetic coil 14 in parallel. The coil terminals A1, A
Two contact terminals for fixed contacts are provided side by side and separated by a partition wall. Reference numeral 5 is a terminal cover, and 25a is an operation display piece integrally formed with the support 25 shown in FIG. The movable block of the polarized electromagnet device is moved by manually operating the operation display piece 25a, and the light emitting element LED of the operation indicator lamp 2 instantaneously emits light by the operation of the polarized electromagnet device, which will be described later.

3 and 4 show a polar electromagnet device,
3 and 4, the same components as those shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted. FIG. 3 shows a reset (OFF) state of the polarized electromagnet device 1 and corresponds to (A) of FIG. In the state shown in FIG. 3, the magnetic flux from the permanent magnet 12 flows in two circuits of ΦEF1 and ΦFG1, voids E and F are formed in ΦEF1, and voids F and G are formed in ΦFG1, respectively. Is E
Due to the relationship of + F> F + G, most magnetic flux flows in ΦFG1. From this state, the operation display piece 25a exposed to the outside of the electromagnetic contactor 1 shown in FIG.
When it is moved in the direction of the arrow, as shown in FIG. 4, the polar electromagnet device 1 is in the attracting (ON) state. In this state, the magnetic flux from the permanent magnet 12 has a gap of E + F <F +
Since it becomes G, most of it will flow in Φ EF2.
As described above, by manually moving the movable block from the return (OFF) state of FIG. 3 to the suction (ON) state of FIG. 4, the magnetic flux penetrating the inside of the electromagnetic coil 14 becomes Φ EF.
Since the voltage suddenly changes from 1 to ΦEF2, a voltage is instantaneously induced in the electromagnetic coil 14, and the instantaneous current of the light emitting element LED in the operation indicator lamp 2 forming a closed loop with the electromagnetic coil 14 is instantaneously changed. It flows and emits light. If here, the electromagnetic coil 14
If the LED is disconnected, no current will flow to the light emitting element LED even if the movable block is moved by manual operation.
The LED does not emit light, which allows checking for breaks in the electromagnetic coil 14.

The operation indicator lamp 2 can also be used as an operation indicator lamp because the light emitting element LED continuously emits light in a normal state in which a control source is applied to the electromagnetic coil 14 and attracted (ON).

[0013]

As described above, according to the present invention,
A polar electromagnet device that is housed in the lower case and that drives the movable block including the plunger by the combined attractive force of the permanent magnet and the electromagnetic coil, and is housed in the upper case and placed against the fixed contacts. And a contact mechanism portion having a support slidable in the displacement direction of the plunger of the movable block of the polarized electromagnet apparatus, and one end of the plunger of the movable block of the polarized electromagnet apparatus. A lever that connects one end of the support of the movable block and transmits the displacement of the plunger of the movable block to the support, and a contact terminal that is disposed in the upper case and that has a fixed contact and a coil terminal of the electromagnetic coil. In the electromagnetic contactor in which the operation display piece provided on the support of the mechanism section is exposed from the upper case, the light emitting element, the resistance, the
A series circuit of diodes and a terminal piece connected to both ends of the series circuit and fixed to a coil terminal of the electromagnetic coil are provided, and an operation indicator lamp formed as a unit by integrating the series circuit and the terminal piece is provided. , By connecting the terminal piece of this operation indicator to the coil terminal of the electromagnetic coil using terminal screws, the operation indicator piece of the support that holds the movable contact exposed from the upper case of the electromagnetic contactor can be manually operated. When it is operated and moved, the plunger of the movable block moves via the lever, and the movement of this plunger causes a sudden change in the magnetic flux of the permanent magnet passing through the plunger to induce a voltage in the electromagnetic coil. By making the light-emitting element of the operation indicator light emit light by using the voltage induced in the electromagnetic coil, the disconnection check of the electromagnetic coil can be easily performed. The operation indicator lamp has the advantage that the terminal piece can be attached to the coil terminal of the electromagnetic contactor by using the terminal screw, so that the operation indicator lamp can be easily attached to the electromagnetic contactor and can be attached and detached as necessary. .

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an electromagnetic contactor according to the present invention.

FIG. 2 is a perspective view showing an embodiment of an electromagnetic contactor according to the present invention.

FIG. 3 is a sectional view for explaining the operating principle of the polarized electromagnet device.

FIG. 4 is a cross-sectional view for explaining the operation principle of the polarized electromagnet device.

FIG. 5 is a cross-sectional view showing a conventional polarized electromagnet device, and FIGS. 5A and 5B are cross-sectional views for explaining the configuration and operating principle of the polarized electromagnet device.

6A and 6B show an electromagnetic contactor using a polarized electromagnet device of a conventional example, in which FIG. 6A is a transverse sectional view of the electromagnetic contactor, and FIG. 6B is a longitudinal sectional view of the electromagnetic contactor.

[Explanation of symbols]

 1 Electromagnetic contactor 2 Operation indicator lamp 3 Contact part 12 Permanent magnet 14 Electromagnetic coil 15 Plunger 25 Support 25a Operation indicator piece

Claims (1)

[Claims] 1. A polarized electromagnet device housed in a lower case, which drives a movable block including a plunger by a combined attractive force of a permanent magnet and an electromagnetic coil, and a fixed contact housed in an upper case. Of a contact mechanism portion that holds a movable contact arranged to oppose to, and has a support that is slidable in the displacement direction of the plunger of the movable block of the polarized electromagnet device; and a plunger of the movable block of the polarized electromagnet device. A lever that connects one end to one end of the support of the contact mechanism unit and transmits the displacement of the plunger of the movable block to the support, and a contact terminal that is provided in the upper case and that has a fixed contact and a coil terminal of the electromagnetic coil. In the electromagnetic contactor, which has an operation display piece provided on the support of the contact mechanism section exposed from the upper case, a light emitting element, a resistor, a die connected in series. And a series circuit connected to both ends of the series circuit and having terminal pieces fixed to the coil terminals of the electromagnetic coil, the operation indicator lamp formed as a unit by integrating the series circuit and the terminal pieces. An electromagnetic contactor, characterized in that the terminal piece of the operation indicator lamp is connected to the coil terminal of the electromagnetic coil by using a terminal screw.