JP2014112482A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic contactor that allows a low assembly man-hour requirement and a short assembly time.SOLUTION: The electromagnetic contactor includes: fixed contacts 15 interposed in a conduction path, and having a pair of conductive portions 15a spaced at a predetermined distance; a movable contact 24 supported by a movable support part 21, and having movable contact points 25 movable in a direction perpendicular to the direction of extension of the pair of conductive portions into separable contact with fixed contact points 15b disposed on the pair of conductive portions; and an electromagnet 17 having a pair of fixed cores 17a, 17b and a movable core 17i opposed for attraction to the fixed cores. The movable support part 21, 22 is coupled to the movable core. One 17a of the pair of fixed cores 17a, 17b is wound with only an input electromagnetic coil 17d, and the other 17b of the pair of fixed cores 17a, 17b is wound with only a holding electromagnetic coil 17e.

Description

  The present invention relates to an electromagnetic contactor that opens and closes a current supplied to an electrical load device such as an electric motor.

  The electromagnetic contactor is interposed in the energizing path, and has a pair of conductive parts spaced apart from each other at a predetermined distance, and is supported by the movable support part and extends in a direction in which the pair of conductive parts extend. A movable contact that moves in a direction perpendicular to the fixed contact provided on the pair of conductive portions, a fixed iron core, and an electromagnet having a movable iron core disposed opposite to the fixed iron core. It is an apparatus in which a support part is connected to a movable iron core of an electromagnet (for example, Patent Document 1).

In the electromagnet of the device of Patent Document 1, electromagnetic coils are wound around a pair of left and right fixed iron cores. When the movable iron core is attracted to the fixed iron core by exciting the electromagnetic coil, the movable contact and the fixed contact are electrically connected. Connect.
Here, there are two types of electromagnetic coils: a closing electromagnetic coil that attracts the movable iron core to the pair of left and right fixed iron cores, and a holding electromagnetic coil that holds the movable iron core adsorbed to the pair of left and right stationary iron cores. An electromagnet is known (for example, Patent Document 2).

FIG. 4 shows an electromagnet 4 of Patent Document 2, in which input electromagnetic coils 6a and 6b are wound around coil holders 5 of a pair of left and right fixed iron cores 3a and 3b, respectively. The holding electromagnetic coils 7a and 7b are wound around the outer periphery of the coil. As shown in FIG. 5, the electromagnet 4 includes the closing electromagnetic coils 6 a and 6 b connected in series, the holding electromagnetic coils 7 a and 7 b connected in series, the closing electromagnetic coils 6 a and 6 b and the holding electromagnetic coil 7 a, 7b is connected in series, and a normally closed contact (b contact) changeover switch 8 is connected in parallel to the holding electromagnetic coils 7a and 7b. Then, after exciting the input electromagnetic coils 6a and 6b to attract the movable iron core 2 to the pair of fixed iron cores 3a and 3b, the changeover switch 8 is opened to maintain the attracted state of the movable iron core 2. The holding electromagnetic coils 7a and 7b are excited.
In this structure, since the internal resistances of the holding electromagnetic coils 7a and 7b are larger than the internal resistances of the input electromagnetic coils 6a and 6b, heat loss of the electromagnetic coils can be reduced.

JP 2000-331585 A JP 2000-82374 A

  However, the electromagnet 4 shown in FIG. 4 is assembled by winding the closing electromagnetic coils 6a and 6b around the coil holder 5 of the pair of fixed iron cores 3a and 3b, and then winding the holding electromagnetic coils 7a and 7b around the outer periphery thereof. Therefore, it is necessary to insulate between the closing electromagnetic coil 6a and the holding electromagnetic coil 7a (between the closing electromagnetic coil 6b and the holding electromagnetic coil 7b) with insulating paper or the like, which may increase the number of assembly steps. is there.

Further, since the holding electromagnetic coils 7a and 7b have a smaller wire diameter than the input electromagnetic coils 6a and 6b, disconnection is likely to occur when the holding electromagnetic coils 7a and 7b are wound around the outer periphery of the input electromagnetic coils 6a and 6b. For this reason, it is necessary to carefully wind the holding electromagnetic coils 7a and 7b around the outer circumferences of the input electromagnetic coils 6a and 6b so as not to be disconnected, and much time is required for assembling the electromagnetic contactor.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an electromagnetic contactor that can reduce the number of assembly steps and shorten the assembly time.

  In order to solve the above-described problem, an electromagnetic contactor according to an embodiment includes a fixed contact having a pair of conductive parts that are interposed in an energizing path and spaced apart from each other, and a movable support part. A movable contact having a movable contact that is supported and moves in a direction perpendicular to the direction in which the pair of conductive portions extend and contacts and separates from the fixed contact provided on the pair of conductive portions, the fixed iron core, and the fixed iron core And an electromagnet having a movable iron core disposed oppositely so as to be attracted thereto, and a movable support portion is connected to the movable iron core of the electromagnet, and includes a pair of fixed iron cores facing the movable iron core. The electromagnetic contactor is formed by winding only the input electromagnetic coil around one of the pair of fixed iron cores and winding only the holding electromagnetic coil around the other of the pair of fixed iron cores.

According to the electromagnetic contactor according to this embodiment, compared to a conventional device in which two types of electromagnetic coils (a closing electromagnetic coil and a holding electromagnetic coil) are wound around one fixed iron core, the closing electromagnetic coil and the holding electromagnetic coil There is no need to insulate the space with insulating paper. It is not necessary to wind the coil carefully so as not to cause disconnection.
The electromagnetic contactor according to one embodiment excites the closing electromagnetic coil to attract the movable iron core to the one fixed iron core, and excites both the closing electromagnetic coil and the holding electromagnetic coil. It is preferable that a changeover switch for attracting and holding the movable iron core to the pair of fixed iron cores is provided.

  According to the electromagnetic contactor according to this one embodiment, by the switching operation of the changeover switch, the input electromagnetic coil is excited to generate an electromagnetic force in one fixed iron core, and the movable iron core is attracted to the one fixed iron core. Then, both the closing electromagnetic coil and the holding electromagnetic coil are excited to generate an electromagnetic force in the pair of fixed iron cores, and the operation of holding the attracted state of the movable iron core with the pair of fixed iron cores can be performed reliably.

  According to the electromagnetic contactor of the present invention, compared with the electromagnet of the conventional apparatus in which two types of electromagnetic coils (the input electromagnetic coil and the holding electromagnetic coil) are wound around one fixed iron core, the gap between the input electromagnetic coil and the holding electromagnetic coil is increased. It is not necessary to insulate the wire with insulating paper, and the electromagnet can be manufactured without the need to wind the coil carefully so that disconnection does not occur. Therefore, the number of assembly steps can be reduced and the assembly time can be shortened. Can do.

It is a longitudinal cross-sectional view which shows the electromagnetic contactor of the interruption | blocking state which concerns on this invention. It is a figure which shows the electrical connection relationship of the electromagnetic coil which comprises the electromagnet of the electromagnetic contactor which concerns on this invention. It is a longitudinal cross-sectional view which shows the electromagnetic contactor of the electricity supply state which concerns on this invention. It is a longitudinal cross-sectional view which shows the electromagnet of the conventional electromagnetic contactor. It is a figure which shows the electrical connection relation of the electromagnetic coil which comprises the electromagnet of the conventional electromagnetic contactor.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an electromagnetic contactor 10 according to an embodiment of the present invention.
The main body case of the electromagnetic contactor 10 of the present embodiment is mounted so as to cover the lower case 11 made of an insulating material, the upper case 12 made of an insulating material attached to the upper portion of the lower case 11, and the upper opening of the upper case 12. An arc extinguishing cover 13 made of an insulating material is used.

A fixed contact 15 and a terminal plate 16 are fixed to the upper wall of the lower case 11.
The fixed contact 15 and the terminal plate 16 are provided 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). 15 b is provided, and the lower terminal plate 16 is drawn out of the lower case 11.
Then, by attaching the upper case 12 to the upper part of the lower case 11, the fixed contact 15 is accommodated in the internal space of the upper case 12.

An 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 and 17b and a coil holder 17c on the outer periphery of one fixed iron core 17a.
An electromagnetic coil 17d wound through a coil, an electromagnetic coil 17e wound around the outer periphery of the other fixed iron core 17b through a coil holder 17c, and a lower end surface of the pair of fixed iron cores 17a and 17b. The yoke 17f, magnetic pole plates 17g and 17h provided in contact with the upper end surfaces of the pair of fixed iron cores 17a and 17b, and a movable iron core 17i disposed to face the magnetic pole plates 17g and 17h.

Further, the contact portion 20 is accommodated in the upper space of the lower case 11 and the internal space of the upper case 12.
The contact portion 20 includes a connecting portion 22 that fixes the contact support 21 and the movable iron core 17i of the electromagnet 17, and is connected to the upper portion of the movable holder 23. One plate-like movable contact 24 facing the pair of conductive parts 15a on the load side from above, a movable contact 25 provided at a position facing the fixed contact 15b of the movable contact 24, and a contact support A plurality of contact pressure springs 26 connected to the upper part of 21 and applying a spring urging force downward with respect to the movable contact 24, and a plurality of magnetic pole plates 17g, 17h and the connecting portion 22 are arranged, and the movable iron core 17i. And a return spring 27 that urges the core in a direction away from the fixed iron cores 17a and 17b.

Here, in the electromagnet 17 of the present embodiment, an electromagnetic coil 17d wound around the outer periphery of one fixed iron core 17a of the pair of fixed iron cores 17a and 17b is used as an input electromagnetic coil (hereinafter referred to as an input electromagnetic coil 17d). The electromagnetic coil 17e wound around the outer periphery of the other fixed iron core 17b is a holding electromagnetic coil (hereinafter referred to as a holding electromagnetic coil 17e).
As shown in FIG. 2, the closing electromagnetic coil 17d and the holding electromagnetic coil 17e are connected in series, and a normally closed contact (b contact) changeover switch 18 is connected in parallel to the holding electromagnetic coil 17e. ing. Although not shown in FIG. 1, the changeover switch 18 is disposed in the lower case 11 around the electromagnet 17.

  1 is excited to excite the electromagnetic coil 17d of the electromagnet 17 to generate an electromagnetic force in one fixed iron core 17a, and the movable iron core 17i is used as a spring biasing force of the return spring 27. It overcomes and is attracted to the fixed iron core 17a, and the movable holder 23 moves downward. As a result, as shown in FIG. 3, the movable contact 24 moves downward, and the movable contact 25 is connected to the fixed contact 15 b to become the electromagnetic contactor 10 in the input state.

Next, when the changeover switch 18 of the electromagnetic contactor 10 in the input state is switched to the open state, both the input electromagnetic coil 17d and the holding electromagnetic coil 17e are excited. Thereby, electromagnetic force is generated in both the fixed iron cores 17a and 17b, the movable iron core 17i is attracted and held by the fixed iron cores 17a and 17b, and the contact state of the movable contact 25 and the fixed contact 15b is held.
The movable support portion according to the present invention corresponds to the contact support 21 and the connecting portion 22 of the movable holder 23.

Next, the effect of this embodiment is demonstrated.
In the electromagnetic contactor 10 of this embodiment, only a closing electromagnetic coil 17d is wound around one fixed iron core 17a of a pair of fixed iron cores 17a and 17b constituting the electromagnet 17, and a holding electromagnetic coil is wound around the other fixed iron core 17b. Since only 17e is wound, compared with a conventional device in which two types of electromagnetic coils (a closing electromagnetic coil and a holding electromagnetic coil) are wound around one fixed iron core, a gap between the closing electromagnetic coil and the holding electromagnetic coil is reduced. There is no need to insulate with insulating paper. Moreover, since only one type of electromagnetic coil is wound around one fixed iron core, it is not necessary to wind the coil carefully so as not to cause disconnection. Therefore, the electromagnetic contactor of the present embodiment can reduce the number of assembly steps and shorten the assembly time.

  In the present embodiment, the changeover switch 18 is closed to excite the closing electromagnetic coil 17d 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 for switching. By opening the switch 18, both the closing electromagnetic coil 17d and the holding electromagnetic coil 17e are excited to generate electromagnetic force in the pair of fixed iron cores 17a and 17b, and the movable iron core 17i is generated by the pair of fixed iron cores 17a and 17b. Therefore, it is possible to reliably operate the electromagnetic contactor 10 in the charged state and the held state.

  DESCRIPTION OF SYMBOLS 10 ... Electromagnetic 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 holder, 17d ... throwing electromagnetic coil, 17e ... holding electromagnetic coil, 17f ... yoke, 17g, 17h ... magnetic pole plate, 17i ... movable iron core, 20 ... contact part, 21 ... contact support, 22 ... connection 23: movable holder, 24 ... movable contact, 25 ... movable contact, 26 ... contact pressure spring, 27 ... return spring

Claims (2)

A fixed contact having a pair of conductive parts that are interposed in the current path and spaced apart by a predetermined distance, and a direction that is supported by the movable support part and orthogonal to the direction in which the pair of conductive parts extend. A movable support having a movable contact having a movable contact that moves to and away from a fixed contact provided on a pair of conductive portions, and a fixed iron core and an electromagnet having a movable iron core disposed so as to be attracted to the fixed core. In an electromagnetic contactor whose part is connected to the movable iron core of the electromagnet,
A pair of fixed iron cores facing the movable iron core is provided, and only a closing electromagnetic coil is wound around one of the pair of fixed iron cores, and only a holding electromagnetic coil is wound around the other of the pair of fixed iron cores. Magnetic contactor to do.   Exciting the closing electromagnetic coil to attract the movable iron core to the one fixed iron core, and exciting both the closing electromagnetic coil and the holding electromagnetic coil to attract and hold the movable iron core to the pair of fixed iron cores. The electromagnetic contactor according to claim 1, further comprising a changeover switch.

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