CN103854926A - Electromagnetic contractor - Google Patents

Abstract

The present invention provides an electromagnetic contactor capable of reducing the number of assembling man-hours and shortening the assembling time, comprising: a fixed contact (15), mounted on a current-carrying circuit, and having a pair of conductive parts (15a) spaced apart at a predetermined distance. ); the movable contactor (24), supported by the movable supporting part (21, 22), moves in the direction perpendicular to the direction in which the pair of conductive parts extend, and has a fixed contact with the pair of conductive parts. a movable contact (25) in which the head (15b) contacts or separates; and an electromagnet (17) having a pair of fixed iron cores (17a, 17b) and a movable iron core (17i) arranged opposite to the fixed iron cores capable of being adsorbed , the movable supporting part (21, 22) is connected with the movable iron core. In addition, only one (17a) of the pair of fixed cores (17a, 17b) is wound with the ON electromagnetic coil (17d), and only the other (17b) of the pair of fixed cores (17a, 17b) is wound with Wind the holding solenoid (17e).

Description

Electromagnetic contactor

technical field

The present invention relates to an electromagnetic contactor that switches current supplied to electric load devices such as motors.

Background technique

An electromagnetic contactor is a device that includes the following components: a fixed contact, which is mounted on an energized circuit, and has a pair of conductive parts arranged at a predetermined distance; a movable contact, which is supported by a movable support moving in a direction perpendicular to the direction in which the conductive portion extends, and coming into contact with or separating from fixed contacts provided on a pair of conductive portions; and an electromagnet having a fixed iron core and a movable iron core disposed opposite to the fixed iron core, wherein , the movable support portion is connected to the movable iron core of the electromagnet (for example, Patent Document 1).

In the electromagnet of the device of this patent document 1, electromagnetic coils are respectively wound on a pair of left and right fixed iron cores, and when the electromagnetic coils are excited and the movable iron core is attracted to the fixed iron core, the movable contact and the fixed contact are electrically connected. .

Here, there is known an electromagnet that includes the following two types of electromagnetic coils: an on electromagnetic coil that attracts a movable iron core to a pair of left and right fixed iron cores; The electromagnetic coil is held (for example, Patent Document 2).

Fig. 4 shows the electromagnet 4 of Patent Document 2, on the bobbin 5 of a pair of left and right fixed iron cores 3a, 3b respectively wound on the electromagnetic coil 6a, 6b which is connected, and is wound on the outer circumference of the above-mentioned connected electromagnetic coil 6a, 6b There are holding solenoids 7a, 7b. In this electromagnet 4, as shown in FIG. 5, the connecting electromagnetic coils 6a, 6b are connected in series with each other, the holding electromagnetic coils 7a, 7b are connected in series, the connecting electromagnetic coils 6a, 6b are connected in series with the holding electromagnetic coils 7a, 7b, and, A selector switch 8 of a normally closed contact (b contact) is connected in parallel to the holding electromagnetic coils 7a, 7b. In addition, after energizing the ON electromagnetic coils 6a, 6b to attract the movable iron core 2 to the pair of fixed iron cores 3a, 3b, in order to maintain the adsorbed state of the movable iron core 2, the selector switch 8 is turned off. The holding electromagnetic coils 7a and 7b are brought into an excited state.

In this configuration, since the internal resistance of the holding electromagnetic coils 7a and 7b is larger than the internal resistance of the closing electromagnetic coils 6a and 6b, heat loss of the electromagnetic coils and the like can be reduced.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2000-331585

Patent Document 2: Japanese Unexamined Patent Publication No. 2000-82374

Contents of the invention

The technical problem to be solved by the invention

However, the electromagnet 4 shown in FIG. 4 is assembled by winding the connecting electromagnetic coils 6a, 6b around the bobbin 5 of the pair of fixed iron cores 3a, 3b, and then winding the holding electromagnetic coils 7a, 7b around the outer circumference. Therefore, it is necessary to insulate between the ON electromagnetic coil 6 a and the holding electromagnetic coil 7 a (between the ON electromagnetic coil 6 b and the holding electromagnetic coil 7 b ) with insulating paper or the like, which may increase the number of assembly man-hours.

In addition, since the holding electromagnetic coils 7a, 7b are thinner in wire diameter than the on-electromagnetic coils 6a, 6b, when the holding electromagnetic coils 7a, 7b are wound around the outer peripheries of the on-electromagnetic coils 6a, 6b, disconnection easily occurs. . For this reason, it is necessary to carefully wind the holding electromagnetic coils 7a, 7b around the outer peripheries of the closing electromagnetic coils 6a, 6b so as not to cause disconnection, and therefore it takes a lot of time to assemble the electromagnetic contactor.

The present invention is made in view of the above-mentioned technical problems, and an object of the present invention is to provide an electromagnetic contactor capable of reducing assembly man-hours and shortening assembly time.

Technical means used to solve technical problems

In order to solve the above-mentioned problems, an electromagnetic contactor according to an embodiment of the present invention includes: a fixed contact, which is mounted on an energized circuit, and has a pair of conductive parts spaced apart by a predetermined distance; and a movable contact, which is supported by a movable support part. , which moves in a direction perpendicular to the direction in which the pair of conductive parts extend, has a movable contact that contacts or separates from fixed contacts provided on the pair of conductive parts; and an electromagnet that has a fixed iron core and can be attracted to The fixed iron core and the movable iron core disposed opposite to the iron core, the movable supporting part is connected with the above-mentioned movable iron core of the above-mentioned electromagnet, and the electromagnetic contactor is characterized in that:

A pair of fixed iron cores facing the above-mentioned movable iron core is provided, only the electromagnetic coil is wound on one of the fixed iron cores of the pair of fixed iron cores, and only the electromagnetic coil is wound and held on the other fixed iron core of the pair of fixed iron cores. Electromagnetic coil.

According to the electromagnetic contactor according to this embodiment, compared with the conventional device in which two types of electromagnetic coils (on electromagnetic coil and holding electromagnetic coil) are wound on one fixed iron core, it is not necessary to use insulating paper or the like to wrap the on electromagnetic coil. Insulate from the holding solenoid. It is also not necessary to carefully wind the coil in order not to break the wire.

An electromagnetic contactor according to one embodiment is characterized in that it includes a changeover switch for switching between the following two operations: exciting the above-mentioned on-electromagnetic coil to attract the movable iron core to the one of the fixed iron cores; Both the coil and the holding electromagnetic coil are excited to attract and hold the movable iron core to the pair of fixed iron cores.

According to the electromagnetic contactor of this embodiment, the following two actions can be reliably performed through the switching action of the switch: the electromagnetic coil is excited to generate an electromagnetic force on a fixed iron core, and the movable iron core is attracted to a fixed iron core. The action of the iron core; and the action of exciting both the connecting electromagnetic coil and the holding electromagnetic coil to generate an electromagnetic force in the pair of fixed iron cores, and maintain the adsorption state of the movable iron core by the pair of fixed iron cores.

The effect of the invention

According to the electromagnetic contactor of the present invention, compared with the existing device in which two types of electromagnetic coils (connecting electromagnetic coil and holding electromagnetic coil) are wound on one fixed core, it is not necessary to use insulating paper or the like to separate the connecting electromagnetic coil and holding electromagnetic coil. The coils are insulated, and the electromagnet can be produced without careful winding of the coils so as not to cause disconnection. Therefore, the number of assembly man-hours can be reduced and the assembly time can be shortened.

Description of drawings

Fig. 1 is a longitudinal sectional view showing an electromagnetic contactor in an off state according to the present invention.

Fig. 2 is a diagram showing an electrical connection relationship of electromagnetic coils constituting an electromagnet of the electromagnetic contactor of the present invention.

Fig. 3 is a longitudinal sectional view showing the electromagnetic contactor in the energized state of the present invention.

Fig. 4 is a longitudinal sectional view showing an electromagnet of a conventional electromagnetic contactor.

FIG. 5 is a diagram showing an electrical connection relationship of electromagnetic coils constituting an electromagnet of a conventional electromagnetic contactor.

Explanation of reference signs

10...Magnetic contactor, 11...Lower case, 12...Upper case, 13...Arc extinguishing cover, 15...Fixed contact, 15a...Conductive part, 15b...Fixed contact, 16...Terminal board, 17...Electromagnet , 17a, 17b...fixed iron core, 17c...coil frame, 17d...connecting electromagnetic coil, 17e...maintaining electromagnetic coil, 17f...magnetic yoke, 17g, 17h...magnetic pole plate, 17i...movable iron core, 20...contact part, 21...Contact support, 22...Connection part, 23...Moveable frame, 24...Moveable contact, 25...Moveable contact, 26...Contact pressure spring, 27...Return spring.

Detailed ways

Hereinafter, modes for implementing the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. In the following embodiments, various limitations are given to constituent elements, types, combinations, shapes, relative arrangements, etc., but these are merely examples, and the present invention is not limited thereto.

FIG. 1 is a cross-sectional view showing an electromagnetic contactor 10 according to an embodiment of the present invention.

The body casing of the electromagnetic contactor 10 of the present embodiment includes: a lower casing 11 made of an insulating material; an upper casing 12 made of an insulating material installed on the upper part of the lower casing 11; and to cover the upper part of the upper casing 12 The arc extinguishing cover 13 that is made of insulating material is installed in the way of opening.

The fixed contacts 15 and the terminal board 16 are fixed on the upper wall of the lower housing 11 .

The fixed contact 15 and the terminal board 16 are arranged in pairs on the power supply side and the load side (for example, the left side is the power supply side, and the right side is the load side), and a fixed contact is provided on the upper part of the conductive part 15a of the upper fixed contact 15. The contacts 15 b and the lower terminal board 16 are drawn out of the lower case 11 .

Furthermore, by attaching the upper case 12 to the upper portion of the lower case 11 , the fixed contact 15 is housed in the inner space of the upper case 12 .

The electromagnet 17 is accommodated in the lower space of the lower case 11 . The electromagnet 17 includes: a pair of left and right fixed iron cores 17a, 17b; an electromagnetic coil 17d wound on the outer periphery of one fixed iron core 17a by a bobbin 17c; The electromagnetic coil 17e; the yoke 17f arranged to be in contact with the lower end faces of the pair of fixed iron cores 17a, 17b; the magnetic pole plates 17g, 17h arranged to be in contact with the upper end faces of the pair of fixed iron cores 17a, 17b; 17g and 17h are oppositely arranged movable iron core 17i.

In addition, the contact mechanism 20 is housed in the upper space of the lower case 11 and the inner space of the upper case 12 .

The contact mechanism 20 includes: a movable frame 23 having a contact supporting member 21 and a connecting portion 22 that fixes the movable iron core 17i of the electromagnet 17, and configured to be movable in the vertical direction; a plate-shaped movable contact 24, which is connected to the upper part of the movable frame 23, and is opposite to a pair of conductive parts 15a on the power supply side and the load side from above; the movable contact 25 is arranged on the movable contact 24 and is opposite to the fixed contact 15b and the contact pressure spring 26, which is connected to the upper part of the contact support member 21, and applies a downward elastic force to the movable contact 24; A plurality of them are arranged between them, and a force is applied to the movable iron core 17i in a direction to separate it from the fixed iron cores 17a, 17b.

Here, in the electromagnet 17 of this embodiment, the electromagnetic coil 17d wound around the outer periphery of one of the fixed iron cores 17a, 17b is set as an ON electromagnetic coil (hereinafter referred to as "ON electromagnetic coil"). electromagnetic coil 17d"), and the electromagnetic coil 17e wound around the outer circumference of the other fixed core 17b serves as a holding electromagnetic coil (hereinafter referred to as "holding electromagnetic coil 17e").

Next, as shown in FIG. 2 , the ON electromagnetic coil 17 d is connected in series to the holding electromagnetic coil 17 e, and the changeover switch 18 having a normally closed contact (b contact) is connected in parallel to the holding electromagnetic coil 17 e. The selector switch 18 is not shown in FIG. 1 , but is arranged in the lower casing 11 around the electromagnet 17 .

Next, in the electromagnetic contactor 10 in the off-circuit state of FIG. 1, by exciting the electromagnetic coil 17d of the electromagnet 17, an electromagnetic force is generated in a fixed iron core 17a, and the movable iron core 17i overcomes the elastic force of the return spring 27 and is attracted. When the fixed iron core 17a is reached, the movable frame 23 moves downward. As a result, as shown in FIG. 3 , the movable contactor 24 moves downward, the movable contactor 25 is connected to the fixed contactor 15b, and the electromagnetic contactor 10 is turned on.

Next, the switching switch 18 of the electromagnetic contactor 10 in the ON state is switched to the OFF state, and both the ON electromagnetic coil 17d and the holding electromagnetic coil 17e are excited. Thereby, an electromagnetic force is generated on both the fixed iron cores 17a, 17b, the movable iron core 17i is sucked and held by the fixed iron cores 17a, 17b, and the contact state between the movable contactor 25 and the fixed contactor 15b is maintained.

The movable support portion of the present invention corresponds to the contact support 21 and the connection portion 22 of the movable frame 23 .

Next, the function effect of this embodiment is described:

In the electromagnetic contactor 10 of this embodiment, only the ON electromagnetic coil 17d is wound on one of the pair of fixed iron cores 17a, 17b constituting the electromagnet 17, and only the ON electromagnetic coil 17d is wound on the other fixed iron core 17b. The holding electromagnetic coil 17e, therefore, does not need insulating paper or the like between the turning on electromagnetic coil and the holding electromagnetic coil, compared with the conventional device in which two kinds of electromagnetic coils (on electromagnetic coil and holding electromagnetic coil) are wound on one fixed core. Insulate between. In addition, since only one type of electromagnetic coil is wound on one fixed core, it is not necessary to wind the coil carefully so as not to cause disconnection. Therefore, the electromagnetic contactor of this embodiment can reduce the number of assembly man-hours and shorten the assembly time.

In addition, in this embodiment, by setting the selector switch 18 in the ON state, the ON electromagnetic coil 17d is excited to generate an electromagnetic force in one fixed iron core 17a, and the movable iron core 17i is attracted to the fixed iron core 17a. The changeover switch 18 is turned off, and both the ON electromagnetic coil 17d and the holding electromagnetic coil 17e are excited, so that electromagnetic force is generated in the pair of fixed iron cores 17a, 17b, and the movable iron core 17i is held by the pair of fixed iron cores 17a, 17b. Therefore, it is possible to reliably operate the electromagnetic contactor 10 in the on state and the holding state.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above-described embodiments. Various changes can be made within the scope of the technical thought of the present invention, and they all belong to the protection scope of the present invention.

Claims (2)

1. an electromagnetic contactor, it possesses: fixed contact, be arranged on power-on circuit, there is the pair of conductive portion that keeps predetermined distance ground arranged spaced; Moving contact, by movable support, portion supports, and moves up in the orthogonal side of direction of extending with pair of conductive portion, have can be arranged on the fixed contact contact in pair of conductive portion or the movable contact separating; And electromagnet, thering is fixed iron core and the movable core that can be adsorbed in this fixed iron core and configuration relative to this iron core, the described movable core of movable support portion and described electromagnet links, and this electromagnetic contactor is characterised in that:

Possess a pair of fixed iron core relative with described movable core, on a fixed iron core in described a pair of fixed iron core, only reel and connect solenoid, on another fixed iron core in described a pair of fixed iron core, only reel and keep solenoid.

2. electromagnetic contactor according to claim 1, is characterized in that:

Possess diverter switch, it carries out the switching of following two actions: to described connection magnetic excitation coil, make described movable core be adsorbed in a described fixed iron core; With to described connection solenoid and described maintenance solenoid excitation, make the absorption of described movable core be held in described a pair of fixed iron core.

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