JP2012015088A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable iron core structure for an electromagnet of an electromagnetic contactor which is improved to reduce the number of parts and enhance assemblability with respect to a joint structure between a movable iron core of the electromagnet and a contact piece holder.SOLUTION: In an electromagnetic contactor in which a contact holder 3 is joined to a movable iron core 2e of an electromagnet for operation and the contact holder 3 is driven by excitation and non-excitation control of the electromagnet, the movable iron core 2e comprises a plunger 2f which is engagedly inserted in a spool of a solenoid coil, and a plate-like armature 2g which is directly connected to the tip of the plunger 2f. A pair of projections 2g-2 projecting so as to be positionally aligned with the right and left side edges of the armature 2g are formed integrally with the armature 2g as joint means for securing the contact holder 3 to the movable iron core 2e of the electromagnet, and the joint projections 2g-2 are fitted to fitting grooves 3c formed at the bottom portion of the contact holder 3, thereby joining the movable iron core 2e and the contact holder 3.

Description

  The present invention relates to an electromagnetic contactor, and more particularly to a movable iron core structure of an electromagnet.

As is well known, an electromagnetic contactor is an electric control in which a contactor holder having a movable contactor is connected to a movable iron core of an electromagnet for operation, and the contactor holder is driven by electromagnet excitation and de-excitation to open and close the contact. 2. Description of the Related Art There is known an electromagnetic contactor having an assembly structure in which a polarized electromagnet is adopted as the operation electromagnet as a component of a system and a contact holder is connected to a movable iron core of the electromagnet (for example, see Patent Document 1).
Next, FIGS. 4 to 7 show conventional examples of the electromagnetic contactor having the above configuration, a contact holder mounted on the electromagnetic contactor, and a connection structure between the contact holder and the movable iron core of the operation electromagnet. First, in FIG. 4, 1 is an outer case of an electromagnetic contactor, 2 is an electromagnet for operation, 3 is a contact holder, 4 is a bridge-shaped movable contact (a contact) mounted on the contact holder 3, and 5 is A stationary contact 6 is a main circuit terminal.

 Here, the operation electromagnet 2 includes a solenoid coil (operation coil) 2a, a pair of U-shaped magnetic yokes 2b disposed on the outer peripheral side of the solenoid coil 2a, and a permanent magnet 2c sandwiched between the magnetic yoke 2b and an outer peripheral side thereof. The L-shaped magnetic yoke 2d and the movable iron core 2e are assembled. The movable iron core 2e is a rod-shaped plunger 2f fitted into the coil spool of the solenoid coil 2a, and a plate-shaped armature 2g directly connected to the upper and lower ends of the plunger 2f (clamped) and opposed to the magnetic yokes 2b and 2d. , 2h, and a contact holder 3 is connected to the movable core 2e at the upper portion as described later.

 That is, the contact holder 3 shown in FIG. 5 is made of mold resin, and the movable contacts 4 of each pole are mounted in combination with the contact pressure springs in the window holes 3a opened side by side in the main body frame. An engagement groove 3c is formed on the inner side of the pair of left and right legs 3b projecting to the bottom side of the arm. On the other hand, in the movable iron core 2e of the operation electromagnet 2, as shown in FIG. 6, the connecting plate 7 is crimped to the shaft end of the plunger 2f so as to overlap the upper armature 2g. As shown in FIG. 7, the connecting plate 7 is an independent part in which a hole 7a is formed at the center of the plate surface and engaging projections 7b are formed at both ends. As shown in the figure, the connecting plate 7 is drilled in the center of the hole 7a and the armature 2g. The holes 2g-1 are aligned and the engaging protrusions 7b are overlapped so as to protrude laterally from both the left and right sides of the armature 2g, and then fitted into a stepped protrusion 2f-1 formed on the shaft end of the plunger 2f. And it is not caulking.

Then, in the assembly process of connecting the contact holder 3 to the operation electromagnet 2, the engagement protrusion 7 b of the connecting plate 7 protruding left and right from the armature 2 g is formed on the bottom side of the contact holder 3 as shown in the figure. The movable core 2e and the contact holder 3 are connected to each other by fitting in the engaging groove 3c.
The operation of the polarized electromagnet configured as described above is described in detail in Patent Document 1, and when the solenoid coil 2a is not excited, the spring of the back spring (compression coil spring) 2i disposed on the bottom side of the outer case 1 is used. The armature 2g of the movable iron core 2e is attracted to the magnetic yoke 2d by the force and the magnetic force of the permanent magnet 2c. As a result, the contact holder 3 connected to the movable iron core 2e moves to the illustrated position, and the contact (a contact) of the movable contact 4 is separated from the fixed contact 5 to disconnect the main circuit. On the other hand, when the solenoid coil 2a is excited from this state, the armature 2g of the movable iron core 2e overcomes the magnetic force of the permanent magnet 2c and the spring force of the back spring 2i by the electromagnetic force of the solenoid coil 2a (opposite to the magnetic force of the permanent magnet 2d). , 2h are attracted to the magnetic yoke 2b. Thereby, the contact holder 3 is driven downward from the illustrated position to close the main circuit contact.

JP 2010-3754 A (FIGS. 12 and 13)

By the way, regarding the connecting structure for attaching the contact holder to the movable iron core of the electromagnet, the above-described conventional connecting structure (see FIGS. 6 and 7) has the following problems. That is,
(1) It is necessary to provide a separate connection plate 7 at the shaft end of the movable iron core 2e, which increases the number of parts and the assembly process.
(2) When the armature 2g and the connecting plate 7 are overlapped with the shaft end of the plunger 2f and are caulked and secured, the small-sized connecting projection 7b is secured to the armature 2g so that the angle positioning accuracy is correctly secured. It is difficult to do in actual work.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to improve an electromagnetic contactor that can reduce the number of parts and improve the assembly workability with respect to a connection structure between a movable iron core of an electromagnet and a contact holder. It is in providing the movable iron core structure of an electromagnet.

In order to achieve the above object, according to the present invention, the contact holder is connected to the movable iron core of the operation electromagnet, and the contact holder is driven by the electromagnet excitation / de-energization control to open and close the main circuit contact. In the contactor, which has a plunger in which the movable iron core of the electromagnet is inserted into the spool of the solenoid coil, and a plate-like armature directly connected to the tip of the plunger,
As a connecting means for attaching the contact holder to the movable iron core of the electromagnet, a connecting projection is integrally formed on the armature of the movable core (Claim 1). As a specific mode, the connecting projection of the movable iron core is inserted into the armature. It is a pair of left and right protrusions formed by aligning the left and right edges of the armature that is perpendicular to the method, and is movable by fitting the connecting protrusions into an engaging groove provided at the bottom of the contact holder The iron core and the contact holder are connected to each other (claim 2).

Furthermore, as a third aspect of the present invention, there is provided an electromagnetic contactor for opening and closing a main circuit contact by connecting a contact holder to a movable iron core of an operating electromagnet and driving the contact holder by excitation and de-excitation control of the electromagnet. In the plunger in which the movable iron core of the electromagnet is inserted into the spool of the solenoid coil, and the armature at the tip of the plunger,
As a connecting means for attaching the contact holder to the movable iron core of the electromagnet, the armature of the movable iron core is formed in a circular plate shape, and as a specific mode, the armature is provided at the bottom of the contact holder. So that the movable iron core and the contact holder are connected to each other (claim 4).

  According to the above configuration, the armature of the movable iron core can also serve as the connecting plate to connect the contact holder, omitting the connecting plate with the conventional connecting structure, reducing the number of parts and the number of assembly steps, and accompanying this Product cost can be reduced.

  Further, since there is no need to provide a separate connecting plate on the movable iron core as in the conventional structure, the product can be reduced in size accordingly.

It is a perspective view showing the connection structure of the movable iron core of an electromagnet and the contact holder by the Example of this invention. It is a disassembled perspective view of the movable iron core in FIG. It is a perspective view of the movable iron core by other Examples of this invention. It is side sectional drawing of the electromagnetic contactor used as the implementation object of this invention. It is an external appearance perspective view of the contact holder in FIG. It is a perspective view showing the conventional connection structure which connects between the electromagnet in FIG. 4, a movable iron core, and a contact holder. It is a disassembled perspective view of the movable iron core and connecting plate in FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In the drawings of the embodiment, members corresponding to those in FIGS. 6 and 7 are denoted by the same reference numerals and description thereof is omitted.

  That is, in the embodiment shown in FIGS. 1 and 2, as a connecting means for attaching the contact holder 3 to the movable iron core 2e of the operating electromagnet, integrally with the plate-like armature 2g that is caulked and joined to the shaft end of the plunger 2f, A pair of connecting projections 2g-2 are formed so as to protrude at the center of the left and right side edges perpendicular to the armature insertion method. The protruding length of the connecting protrusion 2g-2 is determined with respect to the interval between the left and right engaging grooves 3c formed in the bottom of the contact holder 3.

  In the assembly process of connecting the contact holder 3 to the movable iron core 2e of the electromagnet, the armature 2g of the movable iron core 2e is projected between the pair of left and right legs 3b protruding toward the bottom of the contact holder 3 as shown in FIG. In the process, the connecting protrusion 2g-2 is fitted into the engaging groove 3c of the contact holder 3 and connected.

  According to the above configuration, the number of parts and the number of assembling steps can be reduced compared to the conventional structure shown in FIG. 7 and the product cost can be reduced. In addition, there is an effect that the size can be reduced by omitting the connecting plate 7 of another part. can get.

  As another embodiment, as shown in FIG. 3, the armature 2g is formed in a circular plate shape and is integrally formed with the plunger 2f. The thickness of the armature 2g is determined with respect to the mutual interval between the left and right engaging grooves 3c formed at the bottom of the contact holder 3.

And the assembly process which connects the contact holder 3 to the movable iron core 2e of an electromagnet is the same as the content demonstrated in Example 1, and it becomes possible to acquire the same effect.
Here, the shape of the armature 2g is a circular plate and is integrally formed with the plunger 2f. However, the armature 2g and the plunger 2f are separate parts, a hole is formed at the center of the armature 2g, and the shaft end of the plunger 2f is formed. Caulking may be combined.

2 Electromagnet for operation 2a Solenoid coil 2e Movable iron core 2f Plunger 2g, 2h Armature 2g-2 Connecting protrusion 3 Contact holder 3c Engaging groove 4 Movable contact

Claims (4)

The contactor holder is connected to the movable iron core of the electromagnet for operation, and the contactor holder is driven by the excitation and deexcitation control of the electromagnet to open and close the main circuit contact. The movable iron core of the electromagnet is the solenoid coil A plunger having a plunger inserted into a spool and a plate-like armature at the tip of the plunger, wherein a connecting projection is integrally formed on the armature of the movable iron core as a connecting means for attaching the contact holder to the movable iron core of the electromagnet. Electromagnetic contactor.   The electromagnetic contactor according to claim 1, wherein the connecting protrusions of the movable iron core are a pair of left and right protrusions formed by aligning the left and right side edges of the armature that are perpendicular to the armature insertion method, An electromagnetic contactor characterized in that the connecting projection is fitted into an engaging groove provided at the bottom of the contact holder to connect the movable iron core and the contact holder.   A contactor holder is connected to the movable iron core of the operating electromagnet, and the contactor holder is operated to control the excitation and de-energization of the electromagnet, and the contactor holder is driven to open and close the main circuit contact. A plunger fitted into the spool of the magnet and an armature at the tip of the plunger, wherein the armature of the movable iron core is shaped like a circular plate as a connecting means for attaching the contact holder to the movable iron core of the electromagnet. Magnetic contactor to do. 4. The electromagnetic contact according to claim 3, wherein the armature is fitted into an engagement groove provided in a bottom portion of the contact holder and the movable iron core and the contact holder are connected to each other. vessel.